LeBot — Short-Answer Anticipation

300 questions · 177 buzzed correct · 70 buzzed wrong · 53 abstained · buzz threshold P≥80% · honest (out-of-fold) probabilities. Each row = the answer the bot would give having heard only that many words. 🔔 = where it commits.
BIOLOGYStanford_2025 ✓ buzzed CORRECT · buzz @ word 9/35 (26% in)
Ehlers-Danlos [EH-lerz DAN-lowz] syndrome is characterized by hypermobility, skin hyperextensibility, 🔔 and tissue fragility. This disorder is caused by mutations in genes that affect the synthesis of what protein, the most abundant in the human body?
gold answer: Collagen
heardbot's guessP(correct)
0 (0%)collagen ✓ 29%
3 (9%)collagen ✓ 48%
6 (18%)collagen ✓ 67%
9 (26%)collagen ✓ 82% 🔔
12 (35%)collagen ✓ 91%
15 (44%)collagen ✓ 96%
18 (53%)collagen ✓ 98%
21 (62%)encode collagen ✗ 57%
24 (71%)collagen ✓ 60%
27 (79%)collagen ✓ 77%
30 (88%)Collagen ✓ 88%
33 (97%)Collagen ✓ 94%
34 (100%)Collagen ✓ 97%
EARTH_SPACEPrometheus 2021 ✓ buzzed CORRECT · buzz @ word 3/11 (30% in)
Hornfels [HORN-fellz] and quartzite 🔔 typically form from what type of metamorphism?
gold answer: Contact
heardbot's guessP(correct)
0 (0%)contact metamorphism ✓ 74%
3 (30%)contact metamorphism ✓ 88% 🔔
6 (60%)contact metamorphism ✓ 95%
9 (90%)contact metamorphism ✓ 98%
10 (100%)contact metamorphism ✓ 99%
BIOLOGYCast ✓ buzzed CORRECT · buzz @ word 3/10 (33% in)
What bonds link glycerol 🔔 to fatty acids in a triglyceride?
gold answer: ESTER LINKAGES
heardbot's guessP(correct)
0 (0%)— 1%
3 (33%)Ester bonds ✓ 83% 🔔
6 (67%)Ester bonds ✓ 94%
9 (100%)Ester bonds ✓ 98%
BIOLOGYSBST (Spring) ✓ buzzed CORRECT · buzz @ word 3/9 (38% in)
Roots may release phytosiderophores 🔔 to absorb what metal ion?
gold answer: IRON / Fe3+
heardbot's guessP(correct)
0 (0%)— 1%
3 (38%)Iron ✓ 85% 🔔
6 (75%)iron ✓ 94%
8 (100%)Iron ✓ 98%
BIOLOGYMIT-2024 ✓ buzzed CORRECT · buzz @ word 9/25 (38% in)
Sharks produce TMAO to avoid the deleterious effects of a 🔔 particular nitrogenous product of protein catabolism. What is the common name for this nitrogenous compound?
gold answer: Urea
heardbot's guessP(correct)
0 (0%)— 0%
3 (12%)counteract urea ✗ 55%
6 (25%)Urea ✓ 66%
9 (38%)urea ✓ 81% 🔔
12 (50%)Urea ✓ 90%
15 (62%)Urea ✓ 95%
18 (75%)Urea ✓ 98%
21 (88%)Urea ✓ 99%
24 (100%)Urea ✓ 100%
CHEMISTRYCSUB ✓ buzzed CORRECT · buzz @ word 9/23 (41% in)
In 1811, what person published a paper that advanced the 🔔 idea that all gases contain the same number of particles per unit volume?
gold answer: AVAGADRO / AVAGADRO’S HYPOTHESIS
heardbot's guessP(correct)
0 (0%)— 0%
3 (14%)Avogadro ✓ 42%
6 (27%)Avogadro ✓ 63%
9 (41%)Avogadro ✓ 80% 🔔
12 (55%)Avogadro ✓ 91%
15 (68%)Avogadro ✓ 96%
18 (82%)Avogadro ✓ 98%
21 (95%)Avogadro ✓ 99%
22 (100%)Avogadro ✓ 100%
BIOLOGYMEHS Rounds ✓ buzzed CORRECT · buzz @ word 3/8 (43% in)
What direction does helicase 🔔 unwind DNA during replication?
gold answer: 3 PRIME TO 5 PRIME
heardbot's guessP(correct)
0 (0%)— 1%
3 (43%)3' to 5' ✓ 88% 🔔
6 (86%)— 8%
7 (100%)3' to 5' ✓ 95%
BIOLOGYSBST ✓ buzzed CORRECT · buzz @ word 3/8 (43% in)
Nematocysts are possessed by 🔔 members of what phylum?
gold answer: CNIDARIA
heardbot's guessP(correct)
0 (0%)cnidarians ✓ 69%
3 (43%)Cnidarians ✓ 89% 🔔
6 (86%)Cnidaria ✓ 91%
7 (100%)Cnidaria ✓ 96%
OTHERNSBA2 ✓ buzzed CORRECT · buzz @ word 15/35 (44% in)
Cantor’s diagonalization argument provides a common proof for the Turing-undecidability of what problem in computability theory, 🔔 which asks whether it is possible to determine whether a particular program will run forever on a given input?
gold answer: HALTING PROBLEM
heardbot's guessP(correct)
0 (0%)— 0%
3 (9%)The uncountability of the real numbers ✗ 43%
6 (18%)The reals are uncountable ✗ 52%
9 (26%)the halting problem ✓ 61%
12 (35%)The halting problem ✓ 77%
15 (44%)The halting problem ✓ 88% 🔔
18 (53%)The halting problem ✓ 94%
21 (62%)The halting problem ✓ 97%
24 (71%)The halting problem ✓ 99%
27 (79%)Halting problem ✓ 83%
30 (88%)Halting problem ✓ 92%
33 (97%)Halting problem ✓ 96%
34 (100%)Halting problem ✓ 98%
BIOLOGYBerkeley-2023 ✓ buzzed CORRECT · buzz @ word 9/21 (45% in)
What process during meiosis results in increased genetic diversity by 🔔 creating chromatids that are a combination of the mother and father?
gold answer: CROSSING OVER
heardbot's guessP(correct)
0 (0%)— 0%
3 (15%)— 1%
6 (30%)Crossing over ✓ 65%
9 (45%)Crossing over ✓ 81% 🔔
12 (60%)Crossing over ✓ 90%
15 (75%)Crossing over ✓ 95%
18 (90%)Crossing over ✓ 98%
20 (100%)Crossing over ✓ 99%
EARTH_SPACEGWHS Rounds ✓ buzzed CORRECT · buzz @ word 6/14 (46% in)
Give the name for the largest canyon 🔔 in the Solar System, found on Mars.
gold answer: VALLES MARINERIS
heardbot's guessP(correct)
0 (0%)— 1%
3 (23%)— 1%
6 (46%)Valles Marineris ✓ 80% 🔔
9 (69%)Valles Marineris ✓ 92%
12 (92%)Valles Marineris ✓ 97%
13 (100%)Valles Marineris ✓ 98%
PHYSICSBASED-2025 ✓ buzzed CORRECT · buzz @ word 12/26 (48% in)
What equation for fluid flow states that the amount of water flowing into 🔔 a point must equal the amount of water flowing out of that point?
gold answer: CONTINUITY EQUATION
heardbot's guessP(correct)
0 (0%)— 0%
3 (12%)Bernoulli's equation ✗ 60%
6 (24%)Bernoulli's equation ✗ 77%
9 (36%)Continuity equation ✓ 72%
12 (48%)Continuity equation ✓ 85% 🔔
15 (60%)continuity equation ✓ 93%
18 (72%)Continuity equation ✓ 96%
21 (84%)Continuity equation ✓ 98%
24 (96%)Continuity equation ✓ 99%
25 (100%)The continuity equation ✓ 87%
ENERGYMIT-2022 ✓ buzzed CORRECT · buzz @ word 24/50 (49% in)
The Pentelute lab at MIT is synthesizing bioconjugated proteins to target superbugs. What group of high-yield, stereospecific organic reactions is the lab using to join 🔔 small molecules to the proteins, an example of which is the reaction of an alkyne with an azide using copper (I) (read: copper one) catalysis?
gold answer: Click chemistry
heardbot's guessP(correct)
0 (0%)— 0%
3 (6%)— 0%
6 (12%)— 0%
9 (18%)— 0%
12 (24%)— 0%
15 (31%)— 0%
18 (37%)Click chemistry ✓ 54%
21 (43%)Click chemistry ✓ 71%
24 (49%)Click chemistry ✓ 83% 🔔
27 (55%)Click chemistry ✓ 91%
30 (61%)Click chemistry ✓ 95%
33 (67%)Click chemistry ✓ 98%
36 (73%)Click chemistry ✓ 99%
39 (80%)Click chemistry ✓ 99%
42 (86%)Click chemistry ✓ 100%
45 (92%)Click chemistry ✓ 100%
48 (98%)Click chemistry ✓ 100%
49 (100%)Click chemistry ✓ 100%
BIOLOGYPrometheus 2021 ✓ buzzed CORRECT · buzz @ word 12/25 (50% in)
Mediated by AMPA and NMDA receptors, what term is given to repeated stimulation 🔔 of a neuronal synapse leading to a longlasting increase in synaptic strength?
gold answer: Long-term potentiation / LTP
heardbot's guessP(correct)
0 (0%)— 0%
3 (12%)— 0%
6 (25%)Long-term potentiation ✓ 51%
9 (38%)Long-term potentiation ✓ 69%
12 (50%)Long-term potentiation ✓ 82% 🔔
15 (62%)Long-term potentiation ✓ 91%
18 (75%)Long-term potentiation ✓ 95%
21 (88%)Long-term potentiation ✓ 98%
24 (100%)Long-term potentiation ✓ 99%
EARTH_SPACEMEHS Rounds ✓ buzzed CORRECT · buzz @ word 12/25 (50% in)
What type of mass movement is the slowest and is caused by the 🔔 downslope movement of particles that occurs on slopes covered with loose material?
gold answer: CREEP
heardbot's guessP(correct)
0 (0%)— 0%
3 (12%)— 0%
6 (25%)— 1%
9 (38%)Creep ✓ 64%
12 (50%)Creep ✓ 80% 🔔
15 (62%)Creep ✓ 91%
18 (75%)Creep ✓ 96%
21 (88%)Creep ✓ 98%
24 (100%)Creep ✓ 99%
PHYSICSAVES-2025 ✓ buzzed CORRECT · buzz @ word 24/49 (50% in)
What experiment, in which electrons in a vacuum tube were shot through a thin vapor of mercury, showed that electrons lost a fixed amount of 🔔 kinetic energy when collided with a mercury atom and was the first experiment to support the quantum nature of electrons in an electrical perspective?
gold answer: Franck-Hertz Experiment
heardbot's guessP(correct)
0 (0%)— 0%
3 (6%)— 0%
6 (12%)Davisson-Germer experiment ✗ 30%
9 (19%)Davisson-Germer experiment ✗ 47%
12 (25%)Davisson-Germer experiment ✗ 64%
15 (31%)Franck-Hertz experiment ✓ 42%
18 (38%)Franck-Hertz experiment ✓ 60%
21 (44%)Franck-Hertz experiment ✓ 76%
24 (50%)Franck-Hertz experiment ✓ 86% 🔔
27 (56%)Franck-Hertz experiment ✓ 93%
30 (62%)Franck-Hertz experiment ✓ 96%
33 (69%)Franck-Hertz experiment ✓ 98%
36 (75%)Franck-Hertz experiment ✓ 99%
39 (81%)Franck-Hertz experiment ✓ 100%
42 (88%)Franck-Hertz experiment ✓ 100%
45 (94%)Franck-Hertz experiment ✓ 100%
48 (100%)Franck-Hertz experiment ✓ 100%
PHYSICSBASIS Peoria Rounds ✓ buzzed CORRECT · buzz @ word 6/13 (50% in)
Which law of thermodynamics is a restatement 🔔 of the transitive property of equality?
gold answer: ZEROTH LAW OF THERMODYNAMICS
heardbot's guessP(correct)
0 (0%)— 1%
3 (25%)— 1%
6 (50%)Zeroth law ✓ 83% 🔔
9 (75%)Zeroth law ✓ 94%
12 (100%)Zeroth law ✓ 98%
ENERGYNWI-2025 ✓ buzzed CORRECT · buzz @ word 15/30 (52% in)
Although now used for rapid weight loss, in 1921 Dr. Russell Wilder used what type of 🔔 diet characterized by its high fat yet low carbohydrate content to combat epilepsy? (AI)
gold answer: KETOGENIC / KETO
heardbot's guessP(correct)
0 (0%)— 0%
3 (10%)— 0%
6 (21%)— 1%
9 (31%)Ketogenic diet ✓ 58%
12 (41%)Ketogenic diet ✓ 74%
15 (52%)Ketogenic diet ✓ 85% 🔔
18 (62%)Ketogenic diet ✓ 92%
21 (72%)Ketogenic diet ✓ 96%
24 (83%)Ketogenic ✓ 80%
27 (93%)Ketogenic diet ✓ 82%
29 (100%)Ketogenic diet ✓ 90%
EARTH_SPACEAVES-2025 ✓ buzzed CORRECT · buzz @ word 15/30 (52% in)
What rock texture is formed by an intergrowth of lamellae of two different minerals, typically potassium- 🔔 and sodium-rich feldspar, that once formed a solid solution before undergoing exsolution during cooling?
gold answer: Perthitic
heardbot's guessP(correct)
0 (0%)— 0%
3 (10%)— 0%
6 (21%)— 0%
9 (31%)perthite ✓ 54%
12 (41%)Perthite ✓ 71%
15 (52%)Perthite ✓ 84% 🔔
18 (62%)Perthite ✓ 92%
21 (72%)Perthite ✓ 96%
24 (83%)Perthite ✓ 98%
27 (93%)Perthite ✓ 99%
29 (100%)Perthite ✓ 100%
BIOLOGYICSBT-2025 ✓ buzzed CORRECT · buzz @ word 15/30 (52% in)
Plants use the glutamine synthetase–glutamate synthase pathway to assimilate nitrogen into usable organic compounds. What electron 🔔 carrier reduces glutamine in the pathway to convert it to glutamate for later transamination?
gold answer: Ferredoxin
heardbot's guessP(correct)
0 (0%)— 0%
3 (10%)GS-GOGAT ✗ 49%
6 (21%)nitrogen assimilation ✗ 59%
9 (31%)Ammonium ✗ 69%
12 (41%)glutamine ✗ 77%
15 (52%)Ferredoxin ✓ 83% 🔔
18 (62%)Ferredoxin ✓ 91%
21 (72%)Ferredoxin ✓ 96%
24 (83%)Ferredoxin ✓ 98%
27 (93%)Ferredoxin ✓ 99%
29 (100%)Ferredoxin ✓ 100%
PHYSICSIGNIS 2022 ✓ buzzed CORRECT · buzz @ word 9/18 (53% in)
What principle states that in the limit of large quantum 🔔 numbers, quantum physics becomes equivalent to classical physics?
gold answer: Correspondence principle
heardbot's guessP(correct)
0 (0%)— 0%
3 (18%)— 1%
6 (35%)Correspondence principle ✓ 70%
9 (53%)Correspondence principle ✓ 85% 🔔
12 (71%)Correspondence principle ✓ 93%
15 (88%)Correspondence principle ✓ 97%
17 (100%)Correspondence principle ✓ 99%
BIOLOGYtexas_sci_bowl_2025 ✓ buzzed CORRECT · buzz @ word 9/18 (53% in)
Which oxygen-carrying protein found in the root nodules of legumes 🔔 helps provide an anaerobic environment for nitrogen fixation?
gold answer: Leghemoglobin
heardbot's guessP(correct)
0 (0%)— 1%
3 (18%)hemoglobin ✗ 66%
6 (35%)Leghemoglobin ✓ 76%
9 (53%)Leghemoglobin ✓ 88% 🔔
12 (71%)Leghemoglobin ✓ 94%
15 (88%)Leghemoglobin ✓ 98%
17 (100%)Leghemoglobin ✓ 99%
BIOLOGYWalton Rounds ✓ buzzed CORRECT · buzz @ word 9/18 (53% in)
What kind of nephrons have short loops of Henle and 🔔 are most entirely confined to the renal cortex?
gold answer: CORTICAL NEPHRONS
heardbot's guessP(correct)
0 (0%)— 0%
3 (18%)juxtamedullary nephrons ✗ 54%
6 (35%)Cortical nephrons ✓ 65%
9 (53%)Cortical nephrons ✓ 83% 🔔
12 (71%)Cortical nephrons ✓ 92%
15 (88%)Cortical nephrons ✓ 97%
17 (100%)Cortical nephrons ✓ 99%
PHYSICSDeadbird Invitational ✓ buzzed CORRECT · buzz @ word 9/18 (53% in)
What law in physics states that quantum systems must reproduce 🔔 results from classical physics at sufficiently large scales?
gold answer: CORRESPONDENCE PRINCIPLE
heardbot's guessP(correct)
0 (0%)— 1%
3 (18%)— 1%
6 (35%)Pauli exclusion principle ✗ 71%
9 (53%)The correspondence principle ✓ 81% 🔔
12 (71%)Correspondence principle ✓ 87%
15 (88%)Correspondence principle ✓ 95%
17 (100%)Correspondence principle ✓ 98%
ENERGYWSBT ✓ buzzed CORRECT · buzz @ word 30/57 (54% in)
Lawrence Berkeley physicists observe that distant regions of space in opposite directions are so far apart that they could never have been in causal impact with one another, given the speed 🔔 of light and the age of the universe. What is the name of this observation, which was known as a limitation of the big bang theory?
gold answer: Horizon problem / Homogeneity problem
heardbot's guessP(correct)
0 (0%)Lawrence Berkeley National Laboratory ✗ 24%
3 (5%)— 0%
6 (11%)Dark energy ✗ 32%
9 (16%)Dark energy ✗ 49%
12 (21%)— 0%
15 (27%)The horizon problem ✓ 43%
18 (32%)— 0%
21 (38%)The horizon problem ✓ 48%
24 (43%)Horizon problem ✓ 55%
27 (48%)Horizon problem ✓ 72%
30 (54%)Horizon problem ✓ 84% 🔔
33 (59%)The horizon problem ✓ 62%
36 (64%)The horizon problem ✓ 77%
39 (70%)Horizon problem ✓ 67%
42 (75%)Horizon problem ✓ 80%
45 (80%)The horizon problem ✓ 71%
48 (86%)Horizon problem ✓ 73%
51 (91%)Horizon problem ✓ 85%
54 (96%)Horizon problem ✓ 92%
56 (100%)Horizon problem ✓ 96%
PHYSICSMOSFET-2 ✓ buzzed CORRECT · buzz @ word 12/23 (55% in)
What physical quantity is the rotational analog of mass and is multiplied by 🔔 angular acceleration to give the net torque on an object?
gold answer: MOMENT OF INERTIA / ROTATIONAL INERTIA
heardbot's guessP(correct)
0 (0%)— 0%
3 (14%)— 0%
6 (27%)Moment of inertia ✓ 60%
9 (41%)Moment of inertia ✓ 78%
12 (55%)Moment of inertia ✓ 90% 🔔
15 (68%)Moment of inertia ✓ 95%
18 (82%)Moment of inertia ✓ 98%
21 (95%)Moment of inertia ✓ 99%
22 (100%)Moment of inertia ✓ 100%
PHYSICSBTHS-2025 ✓ buzzed CORRECT · buzz @ word 12/23 (55% in)
Which principle in quantum mechanics states that it is impossible to simultaneously know 🔔 both the exact position and exact momentum of a particle?
gold answer: Heisenberg’s Uncertainty Principle / Uncertainty Principle
heardbot's guessP(correct)
0 (0%)— 0%
3 (14%)— 0%
6 (27%)uncertainty principle ✓ 58%
9 (41%)Heisenberg Uncertainty Principle ✓ 71%
12 (55%)Heisenberg uncertainty principle ✓ 84% 🔔
15 (68%)Heisenberg Uncertainty Principle ✓ 92%
18 (82%)Heisenberg Uncertainty Principle ✓ 96%
21 (95%)Heisenberg uncertainty principle ✓ 98%
22 (100%)Heisenberg uncertainty principle ✓ 99%
PHYSICSMIT-2024 ✓ buzzed CORRECT · buzz @ word 12/23 (55% in)
In the vicinity of atomic nuclei, high energy photons are able to undergo 🔔 what process to produce new leptons and their corresponding antiparticles?
gold answer: Pair Production
heardbot's guessP(correct)
0 (0%)— 0%
3 (14%)— 0%
6 (27%)Pair production ✓ 60%
9 (41%)Pair production ✓ 78%
12 (55%)Pair production ✓ 90% 🔔
15 (68%)Pair production ✓ 95%
18 (82%)Pair production ✓ 98%
21 (95%)Pair production ✓ 99%
22 (100%)Pair production ✓ 100%
BIOLOGYWISC-2021 ✓ buzzed CORRECT · buzz @ word 12/23 (55% in)
What mineral, which is formed when calcium, phosphate, and hydroxyl ions are deposited 🔔 on a collagen matrix, forms the hard part of bone?
gold answer: HYDROXYAPATITE
heardbot's guessP(correct)
0 (0%)— 0%
3 (14%)— 0%
6 (27%)Hydroxyapatite ✓ 50%
9 (41%)Hydroxyapatite ✓ 71%
12 (55%)Hydroxyapatite ✓ 85% 🔔
15 (68%)Hydroxyapatite ✓ 93%
18 (82%)Hydroxyapatite ✓ 97%
21 (95%)Hydroxyapatite ✓ 99%
22 (100%)Hydroxyapatite ✓ 99%
EARTH_SPACEGWHS Rounds ✓ buzzed CORRECT · buzz @ word 6/12 (55% in)
Over 90% of rock forming minerals are 🔔 found in which mineral group?
gold answer: SILICATES
heardbot's guessP(correct)
0 (0%)— 1%
3 (27%)— 1%
6 (55%)silicates ✓ 83% 🔔
9 (82%)Silicates ✓ 93%
11 (100%)Silicates ✓ 97%
PHYSICSMEHS Rounds ✓ buzzed CORRECT · buzz @ word 6/12 (55% in)
A hydraulic press makes use of what 🔔 principle to lift heavy objects?
gold answer: PASCAL’S PRINCIPLE Page 5 TOSS-UP
heardbot's guessP(correct)
0 (0%)— 1%
3 (27%)— 1%
6 (55%)Pascal's principle ✓ 85% 🔔
9 (82%)Pascal's principle ✓ 94%
11 (100%)Pascal's principle ✓ 98%
EARTH_SPACENSBA2 ✓ buzzed CORRECT · buzz @ word 21/39 (55% in)
As a black hole rotates, it warps spacetime outside the event horizon via frame dragging. What is the name for the region 🔔 where this distortion is so strong that all objects are forced to corotate with the black hole?
gold answer: ERGOSPHERE
heardbot's guessP(correct)
0 (0%)— 0%
3 (8%)— 0%
6 (16%)— 0%
9 (24%)ergosphere ✓ 42%
12 (32%)Frame dragging ✗ 52%
15 (39%)Ergosphere ✓ 55%
18 (47%)Ergosphere ✓ 72%
21 (55%)Ergosphere ✓ 84% 🔔
24 (63%)Ergosphere ✓ 92%
27 (71%)Ergosphere ✓ 96%
30 (79%)Ergosphere ✓ 98%
33 (87%)Ergosphere ✓ 99%
36 (95%)Ergosphere ✓ 100%
38 (100%)Ergosphere ✓ 100%
EARTH_SPACERandom Stuff ✓ buzzed CORRECT · buzz @ word 15/28 (56% in)
What is the term for the luminosity at which the radiation pressure causing a star to 🔔 expand outward is equal to the pressure of gravity pulling itself inward?
gold answer: EDDINGTON LIMIT
heardbot's guessP(correct)
0 (0%)— 0%
3 (11%)— 0%
6 (22%)— 0%
9 (33%)Eddington luminosity ✓ 56%
12 (44%)Eddington luminosity ✓ 74%
15 (56%)Eddington luminosity ✓ 86% 🔔
18 (67%)Eddington luminosity ✓ 93%
21 (78%)Eddington luminosity ✓ 97%
24 (89%)Eddington luminosity ✓ 98%
27 (100%)Eddington luminosity ✓ 99%
BIOLOGYGWHS Rounds ✓ buzzed CORRECT · buzz @ word 9/17 (56% in)
What is the waxy coating on the epidermal surface of 🔔 leaves that helps to prevent water loss?
gold answer: CUTICLE
heardbot's guessP(correct)
0 (0%)— 1%
3 (19%)cuticle ✓ 61%
6 (38%)cuticle ✓ 78%
9 (56%)cuticle ✓ 89% 🔔
12 (75%)cuticle ✓ 95%
15 (94%)cuticle ✓ 98%
16 (100%)Cuticle ✓ 99%
CHEMISTRYMIT-2021 ✓ buzzed CORRECT · buzz @ word 9/17 (56% in)
Azobisisobutyronitrile (AY-zoh-bis-eye-so-bew-TEEro-NY-trile) is a radical initiator which releases what molecule 🔔 to generate two tertiary radicals upon heating?
gold answer: Nitrogen
heardbot's guessP(correct)
0 (0%)AIBN ✗ 51%
3 (19%)radical initiator ✗ 66%
6 (38%)— 1%
9 (56%)Nitrogen ✓ 82% 🔔
12 (75%)Nitrogen ✓ 91%
15 (94%)Nitrogen gas ✓ 92%
16 (100%)Nitrogen ✓ 92%
EARTH_SPACEDasoni Standard1 ✓ buzzed CORRECT · buzz @ word 9/17 (56% in)
In stars, what is the last element produced before nuclear 🔔 fusion requires more energy than it produces?
gold answer: IRON
heardbot's guessP(correct)
0 (0%)— 1%
3 (19%)— 1%
6 (38%)Iron ✓ 75%
9 (56%)Iron ✓ 89% 🔔
12 (75%)Iron ✓ 95%
15 (94%)Iron ✓ 98%
16 (100%)Iron ✓ 99%
PHYSICSMHS Rounds ✓ buzzed CORRECT · buzz @ word 9/17 (56% in)
When a muon decays into an electron, what two other 🔔 particles are created to conserve lepton number?
gold answer: ELECTRON ANTINEUTRINO AND MUON NEUTRINO
heardbot's guessP(correct)
0 (0%)— 1%
3 (19%)— 1%
6 (38%)— 1%
9 (56%)Muon neutrino and electron antineutr ✓ 80% 🔔
12 (75%)A muon neutrino and an electron antineu ✗ 87%
15 (94%)A muon neutrino and an electron antineu ✗ 94%
16 (100%)A muon neutrino and an electron antineu ✗ 97%
BIOLOGYSSBT-2023 ✓ buzzed CORRECT · buzz @ word 12/22 (57% in)
Large doses of ultraviolet radiation are a known carcinogen due to the creation 🔔 of what irregular structure formed between two adjacent pyrimidines?
gold answer: THYMINE DIMER / CYCLOBUTYL RING FORMATION
heardbot's guessP(correct)
0 (0%)— 0%
3 (14%)— 1%
6 (29%)mutagen ✗ 63%
9 (43%)thymine dimers ✓ 73%
12 (57%)thymine dimers ✓ 86% 🔔
15 (71%)Thymine dimers ✓ 93%
18 (86%)Thymine dimers ✓ 97%
21 (100%)Thymine dimer ✓ 87%
EARTH_SPACEPrometheus 2021 ✓ buzzed CORRECT · buzz @ word 12/22 (57% in)
The intensity of sunspot magnetic fields can be determined by the strength of 🔔 spectral line splitting that occurs due to what effect?
gold answer: Zeeman effect
heardbot's guessP(correct)
0 (0%)— 0%
3 (14%)solar cycle ✗ 58%
6 (29%)— 1%
9 (43%)Zeeman effect ✓ 74%
12 (57%)the Zeeman effect ✓ 82% 🔔
15 (71%)Zeeman effect ✓ 85%
18 (86%)Zeeman effect ✓ 93%
21 (100%)Zeeman effect ✓ 97%
EARTH_SPACEWISC-2021 ✓ buzzed CORRECT · buzz @ word 12/22 (57% in)
What type of metamorphism occurs when rocks adjacent to an igneous intrusion are 🔔 altered by the extreme heat of the magma? [JI]
gold answer: CONTACT METAMORPHISM
heardbot's guessP(correct)
0 (0%)— 1%
3 (14%)— 1%
6 (29%)— 1%
9 (43%)contact metamorphism ✓ 72%
12 (57%)Contact metamorphism ✓ 84% 🔔
15 (71%)contact metamorphism ✓ 92%
18 (86%)contact metamorphism ✓ 96%
21 (100%)contact metamorphism ✓ 98%
EARTH_SPACEMOSFET-2 ✓ buzzed CORRECT · buzz @ word 15/27 (58% in)
What class of stars, denoted by spectral class M, are the most common stars in the 🔔 Milky Way and comprise the smallest stars on the main sequence?
gold answer: RED DWARFS
heardbot's guessP(correct)
0 (0%)— 0%
3 (12%)— 0%
6 (23%)— 0%
9 (35%)Red dwarfs ✓ 58%
12 (46%)Red dwarfs ✓ 77%
15 (58%)Red dwarfs ✓ 88% 🔔
18 (69%)Red dwarfs ✓ 95%
21 (81%)Red dwarfs ✓ 98%
24 (92%)Red dwarfs ✓ 99%
26 (100%)Red dwarfs ✓ 100%
CHEMISTRYICSBT-2025 ✓ buzzed CORRECT · buzz @ word 15/27 (58% in)
What effect, in which spatially close hydrogens affect each others’ integrated peak intensities, is used in 🔔 proton NMR to determine stereochemical and conformational relationships between hydrogen atoms?
gold answer: Nuclear Overhauser Effect
heardbot's guessP(correct)
0 (0%)— 0%
3 (12%)— 0%
6 (23%)NOE ✓ 40%
9 (35%)Nuclear Overhauser Effect ✓ 50%
12 (46%)Nuclear Overhauser Effect ✓ 70%
15 (58%)Nuclear Overhauser Effect ✓ 85% 🔔
18 (69%)Nuclear Overhauser Effect ✓ 93%
21 (81%)Nuclear Overhauser Effect ✓ 97%
24 (92%)Nuclear Overhauser Effect ✓ 99%
26 (100%)Nuclear Overhauser Effect ✓ 99%
BIOLOGYmosfet1 ✓ buzzed CORRECT · buzz @ word 24/42 (59% in)
What is the name given to the bonds that form which form between phosphate groups and hydroxyl groups that connect different nucleotides in a DNA 🔔 strand? Commented [12]: _Re-opened_ Commented [13]: westmin and reyna Commented [14]: _Marked as resolved_ Commented [15]: _Re-opened_
gold answer: PHOSPHODIESTER BONDS
heardbot's guessP(correct)
0 (0%)— 0%
3 (7%)— 0%
6 (15%)— 0%
9 (22%)— 0%
12 (29%)— 0%
15 (37%)Phosphodiester bonds ✓ 45%
18 (44%)Phosphodiester bonds ✓ 63%
21 (51%)Phosphodiester bonds ✓ 78%
24 (59%)Phosphodiester bonds ✓ 88% 🔔
27 (66%)Phosphodiester bonds ✓ 94%
30 (73%)Phosphodiester bonds ✓ 97%
33 (80%)Phosphodiester bonds ✓ 99%
36 (88%)Phosphodiester bonds ✓ 99%
39 (95%)Phosphodiester bonds ✓ 100%
41 (100%)Phosphodiester bonds ✓ 100%
EARTH_SPACEMIT-2020 ✓ buzzed CORRECT · buzz @ word 24/42 (59% in)
Radio observations of the Crab Nebula show that the gas in the nebula is emitting radiation, thought to be caused by high speed electrons spiralling 🔔 through the magnetic field produced by the central neutron star. What is the term for this radiation?
gold answer: Sychrotron radiation
heardbot's guessP(correct)
0 (0%)— 0%
3 (7%)— 0%
6 (15%)— 0%
9 (22%)— 0%
12 (29%)— 0%
15 (37%)synchrotron radiation ✓ 46%
18 (44%)Synchrotron radiation ✓ 64%
21 (51%)Synchrotron radiation ✓ 79%
24 (59%)Synchrotron radiation ✓ 89% 🔔
27 (66%)Synchrotron radiation ✓ 95%
30 (73%)the Crab Pulsar ✗ 67%
33 (80%)Synchrotron radiation ✓ 69%
36 (88%)Synchrotron radiation ✓ 83%
39 (95%)Synchrotron radiation ✓ 91%
41 (100%)Synchrotron radiation ✓ 95%
BIOLOGYMEHS Rounds ✓ buzzed CORRECT · buzz @ word 6/11 (60% in)
What cellular organelle contains chromatin, which condenses 🔔 into chromosomes during prophase?
gold answer: NUCLEUS
heardbot's guessP(correct)
0 (0%)— 1%
3 (30%)— 1%
6 (60%)Nucleus ✓ 82% 🔔
9 (90%)Nucleus ✓ 93%
10 (100%)Nucleus ✓ 96%
BIOLOGYPrometheus 2023 ✓ buzzed CORRECT · buzz @ word 9/16 (60% in)
Temperate phages are able to use the lytic [LIT-ic] cycle 🔔 and what other viral reproductive cycle?
gold answer: Lysogenic
heardbot's guessP(correct)
0 (0%)— 1%
3 (20%)lysogeny ✓ 67%
6 (40%)lysogenic cycle ✓ 78%
9 (60%)lysogenic cycle ✓ 90% 🔔
12 (80%)Lysogenic cycle ✓ 96%
15 (100%)Lysogenic cycle ✓ 99%
CHEMISTRYSCB-2025 ✓ buzzed CORRECT · buzz @ word 24/41 (60% in)
In a certain type of electrochemical cell, changing the identity of the electrodes does not affect the voltage across the cell. What is the name 🔔 for this cell, in which the electrodes are made using the same material with uneven concentrations?
gold answer: Concentration cell
heardbot's guessP(correct)
0 (0%)— 0%
3 (8%)— 0%
6 (15%)— 0%
9 (22%)— 0%
12 (30%)— 0%
15 (38%)concentration cell ✓ 36%
18 (45%)concentration cell ✓ 52%
21 (52%)concentration cell ✓ 68%
24 (60%)concentration cell ✓ 81% 🔔
27 (68%)concentration cell ✓ 89%
30 (75%)concentration cell ✓ 94%
33 (82%)concentration cell ✓ 97%
36 (90%)Concentration cell ✓ 98%
39 (98%)Concentration cell ✓ 99%
40 (100%)Concentration cell ✓ 100%
OTHERIGNIS 2022 ✓ buzzed CORRECT · buzz @ word 15/26 (60% in)
In game theory, what is the term for a situation in which no participant in the 🔔 game can benefit by changing their strategy on their own?
gold answer: Nash equilibrium
heardbot's guessP(correct)
0 (0%)— 0%
3 (12%)— 0%
6 (24%)— 0%
9 (36%)Nash equilibrium ✓ 56%
12 (48%)Nash equilibrium ✓ 73%
15 (60%)Nash equilibrium ✓ 86% 🔔
18 (72%)Nash equilibrium ✓ 93%
21 (84%)Nash equilibrium ✓ 97%
24 (96%)Nash equilibrium ✓ 98%
25 (100%)Nash equilibrium ✓ 99%
BIOLOGYCast ✓ buzzed CORRECT · buzz @ word 6/11 (60% in)
What are the two kinds of deaths 🔔 that cells can undergo?
gold answer: APOPTOSIS AND NECROSIS
heardbot's guessP(correct)
0 (0%)— 1%
3 (30%)— 2%
6 (60%)Apoptosis and necrosis ✓ 87% 🔔
9 (90%)Apoptosis and necrosis ✓ 95%
10 (100%)Apoptosis and necrosis ✓ 98%
EARTH_SPACENSI_2024 ✓ buzzed CORRECT · buzz @ word 15/26 (60% in)
An exoplanet is discovered orbiting a star by small changes in redshift exhibited by the star. 🔔 What method of exoplanet detection was used in this case?
gold answer: Doppler Spectroscopy / Radial Velocity method
heardbot's guessP(correct)
0 (0%)— 0%
3 (12%)— 1%
6 (24%)— 1%
9 (36%)— 1%
12 (48%)Radial velocity method ✓ 69%
15 (60%)Radial velocity method ✓ 82% 🔔
18 (72%)Radial velocity method ✓ 90%
21 (84%)Radial velocity method ✓ 95%
24 (96%)Radial velocity method ✓ 98%
25 (100%)Radial velocity method ✓ 99%
PHYSICSBTHS-2025 ✓ buzzed CORRECT · buzz @ word 15/26 (60% in)
Which late 1880s physicist was the first to experimentally generate and detect radio waves, providing direct 🔔 proof of the existence of electromagnetic waves postulated by Maxwell?
gold answer: Heinrich Hertz
heardbot's guessP(correct)
0 (0%)— 0%
3 (12%)— 0%
6 (24%)— 1%
9 (36%)Heinrich Hertz ✓ 60%
12 (48%)Heinrich Hertz ✓ 78%
15 (60%)Heinrich Hertz ✓ 89% 🔔
18 (72%)Heinrich Hertz ✓ 95%
21 (84%)Heinrich Hertz ✓ 98%
24 (96%)Heinrich Hertz ✓ 99%
25 (100%)Heinrich Hertz ✓ 100%
EARTH_SPACENNHS Rounds ✓ buzzed CORRECT · buzz @ word 9/16 (60% in)
What class of minerals typically effervesces when a drop of 🔔 hydrochloric acid reacts with its surface?
gold answer: CARBONATES
heardbot's guessP(correct)
0 (0%)— 1%
3 (20%)— 1%
6 (40%)Carbonates ✓ 73%
9 (60%)Carbonates ✓ 88% 🔔
12 (80%)Carbonates ✓ 95%
15 (100%)Carbonates ✓ 98%
PHYSICSSBL ✓ buzzed CORRECT · buzz @ word 18/30 (62% in)
Suppose a charged particle moves with an initial velocity neither parallel nor perpendicular to a uniform magnetic field. What 🔔 type of curve will be traced out by its resultant motion?
gold answer: HELICAL
heardbot's guessP(correct)
0 (0%)— 0%
3 (10%)— 0%
6 (21%)— 0%
9 (31%)— 0%
12 (41%)Helix ✓ 58%
15 (52%)helix ✓ 75%
18 (62%)helix ✓ 87% 🔔
21 (72%)Helix ✓ 94%
24 (83%)Helix ✓ 97%
27 (93%)Helix ✓ 99%
29 (100%)Helix ✓ 99%
PHYSICSFE!M-2025 ✓ buzzed CORRECT · buzz @ word 18/30 (62% in)
The star-delta transform is a special case of the star-mesh transformation for large networks of resistors. How many terminals 🔔 must a circuit have for the star-delta transform to be applicable?
gold answer: 3
heardbot's guessP(correct)
0 (0%)— 0%
3 (10%)Wye-delta transform ✗ 44%
6 (21%)Y-delta transform ✗ 54%
9 (31%)transform ✗ 64%
12 (41%)networks ✗ 73%
15 (52%)— 2%
18 (62%)3 ✓ 83% 🔔
21 (72%)3 ✓ 91%
24 (83%)3 ✓ 96%
27 (93%)3 ✓ 98%
29 (100%)3 ✓ 99%
EARTH_SPACEGWHS Rounds ✓ buzzed CORRECT · buzz @ word 15/25 (62% in)
What is the name for the effect that occurs when light of different wavelengths focuses at 🔔 different places, creating an issue specific to refractive telescopes?
gold answer: CHROMATIC ABERRATION
heardbot's guessP(correct)
0 (0%)— 1%
3 (12%)— 1%
6 (25%)— 1%
9 (38%)— 1%
12 (50%)dispersion ✗ 70%
15 (62%)Chromatic aberration ✓ 80% 🔔
18 (75%)Chromatic aberration ✓ 89%
21 (88%)Chromatic aberration ✓ 95%
24 (100%)Chromatic aberration ✓ 97%
EARTH_SPACECSBL ✓ buzzed CORRECT · buzz @ word 12/20 (63% in)
What hypothesis states that small changes in Earth’s orbit, precession, and inclination affect 🔔 its climate and can cause ice ages?
gold answer: MILANKOVITCH HYPOTHESIS
heardbot's guessP(correct)
0 (0%)— 1%
3 (16%)— 1%
6 (32%)— 1%
9 (47%)Milankovitch hypothesis ✓ 75%
12 (63%)Milankovitch hypothesis ✓ 87% 🔔
15 (79%)Milankovitch hypothesis ✓ 94%
18 (95%)Milankovitch hypothesis ✓ 97%
19 (100%)Milankovitch hypothesis ✓ 98%
EARTH_SPACETHUMB-2025 ✓ buzzed CORRECT · buzz @ word 9/15 (64% in)
The collision of Theia and the Earth is theorized to 🔔 have created what astronomical body?
gold answer: The Moon / Earth’s Moon or equivalent
heardbot's guessP(correct)
0 (0%)— 1%
3 (21%)The Moon ✓ 69%
6 (43%)Moon ✓ 80%
9 (64%)the Moon ✓ 84% 🔔
12 (86%)The Moon ✓ 94%
14 (100%)The Moon ✓ 97%
EARTH_SPACEMIT-2021 ✓ buzzed CORRECT · buzz @ word 9/15 (64% in)
In Earth’s atmosphere, what force is balanced by the gravitational 🔔 force to maintain hydrostatic equilibrium?
gold answer: Pressure-gradient force
heardbot's guessP(correct)
0 (0%)— 1%
3 (21%)— 1%
6 (43%)gravity ✗ 75%
9 (64%)Pressure gradient force ✓ 84% 🔔
12 (86%)pressure gradient force ✓ 93%
14 (100%)Pressure gradient force ✓ 97%
PHYSICSSCB-2025 ✓ buzzed CORRECT · buzz @ word 9/15 (64% in)
What law states that the entropy of a perfect crystal 🔔 at absolute 0 is 0?
gold answer: Third Law of Thermodynamics
heardbot's guessP(correct)
0 (0%)— 1%
3 (21%)— 1%
6 (43%)Third Law of Thermodynamics ✓ 77%
9 (64%)Third Law of Thermodynamics ✓ 90% 🔔
12 (86%)Third Law of Thermodynamics ✓ 96%
14 (100%)Third Law of Thermodynamics ✓ 98%
PHYSICSNWI-2025 ✓ buzzed CORRECT · buzz @ word 30/47 (65% in)
A 1-kilogram object is moving in a vertical circle of radius 2 meters at a constant speed of 6 meters per second. What is the tension in the string at the 🔔 bottom of the circle? Assume the acceleration due to gravity is 10 meters per second squared.
gold answer: 28 N
heardbot's guessP(correct)
0 (0%)— 0%
3 (7%)— 0%
6 (13%)— 0%
9 (20%)— 0%
12 (26%)— 0%
15 (33%)— 0%
18 (39%)🧮 28 ✓ 39%
21 (46%)🧮 8 ✗ 47%
24 (52%)🧮 28 ✓ 50%
27 (59%)🧮 28 ✓ 67%
30 (65%)🧮 28 ✓ 81% 🔔
33 (72%)🧮 28 ✓ 90%
36 (78%)🧮 28 ✓ 95%
39 (85%)🧮 28 ✓ 97%
42 (91%)🧮 28 ✓ 99%
45 (98%)🧮 28 ✓ 99%
46 (100%)🧮 28 ✓ 100%
EARTH_SPACEMOSFET-2 ✓ buzzed CORRECT · buzz @ word 15/24 (65% in)
Though they form in different environments, travertine, chalk, and coquina are all composed of what chemical 🔔 compound, most commonly found as the mineral calcite?
gold answer: CALCIUM CARBONATE / CaCO3
heardbot's guessP(correct)
0 (0%)— 0%
3 (13%)— 0%
6 (26%)— 0%
9 (39%)limestone ✓ 62%
12 (52%)calcium carbonate ✓ 72%
15 (65%)calcium carbonate ✓ 85% 🔔
18 (78%)Calcium carbonate ✓ 93%
21 (91%)Calcium carbonate ✓ 96%
23 (100%)Calcium carbonate ✓ 98%
EARTH_SPACEWalton Rounds ✓ buzzed CORRECT · buzz @ word 18/28 (67% in)
Three tectonic plates meet at a triple junction. One stops spreading and a filled-graben system occurs. What is the 🔔 name of this failed arm of a triple junction?
gold answer: AULACOGEN
heardbot's guessP(correct)
0 (0%)— 0%
3 (11%)— 0%
6 (22%)— 0%
9 (33%)— 0%
12 (44%)— 1%
15 (56%)aulacogen ✓ 65%
18 (67%)Aulacogen ✓ 81% 🔔
21 (78%)Aulacogen ✓ 91%
24 (89%)Aulacogen ✓ 96%
27 (100%)Aulacogen ✓ 98%
OTHERDeadbird Invitational ✓ buzzed CORRECT · buzz @ word 18/27 (69% in)
Mast cells are immune cells found in connective tissue. They are responsible for releasing what molecule that triggers the 🔔 dilation of blood vessels at sites of damage?
gold answer: HISTAMINE
heardbot's guessP(correct)
0 (0%)— 0%
3 (12%)— 1%
6 (23%)— 1%
9 (35%)— 1%
12 (46%)— 1%
15 (58%)histamine ✓ 74%
18 (69%)histamine ✓ 86% 🔔
21 (81%)histamine ✓ 93%
24 (92%)histamine ✓ 97%
26 (100%)histamine ✓ 99%
BIOLOGYDasoni Standard1 ✓ buzzed CORRECT · buzz @ word 9/14 (69% in)
What is the net FADH2 yield per molecule of glucose 🔔 in the Krebs cycle?
gold answer: 2
heardbot's guessP(correct)
0 (0%)— 0%
3 (23%)— 1%
6 (46%)🧮 2 ✓ 67%
9 (69%)🧮 2 ✓ 85% 🔔
12 (92%)🧮 2 ✓ 94%
13 (100%)🧮 2 ✓ 97%
ENERGYMIT-2020 ✓ buzzed CORRECT · buzz @ word 27/40 (69% in)
Researchers in the Gore group at MIT are studying theoretical ecology, using mathematical tools to model populations. Some populations exhibit a minimal critical population size, under which they 🔔 will not survive. This is an example of what type of effect?
gold answer: Allee effect / strong Allee effect
heardbot's guessP(correct)
0 (0%)— 0%
3 (8%)— 0%
6 (15%)— 0%
9 (23%)— 0%
12 (31%)— 0%
15 (38%)— 0%
18 (46%)— 1%
21 (54%)Allee effect ✓ 62%
24 (62%)Allee effect ✓ 78%
27 (69%)Allee effect ✓ 89% 🔔
30 (77%)Allee effect ✓ 95%
33 (85%)Allee effect ✓ 97%
36 (92%)Allee effect ✓ 99%
39 (100%)Allee effect ✓ 99%
MATHSSBT-2023 ✓ buzzed CORRECT · buzz @ word 21/31 (70% in)
An equilateral triangle with side length 4 has the same area as a trapezoid with height 8. What is the sum of 🔔 the lengths of the two bases of the trapezoid?
gold answer: √3
heardbot's guessP(correct)
0 (0%)— 0%
3 (10%)— 0%
6 (20%)🧮 6.928 ✗ 24%
9 (30%)🧮 9 ✗ 34%
12 (40%)🧮 2.632 ✗ 46%
15 (50%)🧮 1.732 ✓ 58%
18 (60%)🧮 1.732 ✓ 74%
21 (70%)🧮 1.732 ✓ 85% 🔔
24 (80%)🧮 1.732 ✓ 92%
27 (90%)🧮 1.732 ✓ 96%
30 (100%)🧮 1.732 ✓ 98%
PHYSICSSBST (Spring) ✓ buzzed CORRECT · buzz @ word 21/31 (70% in)
What is the name of the effect responsible for an increase in the effective resistance of wires at high frequencies as current 🔔 density is concentrated at the surface of the conductor?
gold answer: SKIN EFFECT
heardbot's guessP(correct)
0 (0%)— 0%
3 (10%)— 0%
6 (20%)— 0%
9 (30%)— 0%
12 (40%)— 0%
15 (50%)Skin effect ✓ 59%
18 (60%)Skin effect ✓ 76%
21 (70%)Skin effect ✓ 87% 🔔
24 (80%)Skin effect ✓ 94%
27 (90%)Skin effect ✓ 97%
30 (100%)Skin effect ✓ 99%
PHYSICSMIT-2025 ✓ buzzed CORRECT · buzz @ word 21/31 (70% in)
A 2 kilogram ball collides and sticks with a 4 kilogram ball at rest. What fraction of the kinetic energy of the 🔔 system of two balls is lost during the collision?
gold answer: 2/3
heardbot's guessP(correct)
0 (0%)— 0%
3 (10%)— 0%
6 (20%)— 0%
9 (30%)— 0%
12 (40%)— 1%
15 (50%)🧮 2/3 ✓ 61%
18 (60%)🧮 2/3 ✓ 78%
21 (70%)🧮 2/3 ✓ 89% 🔔
24 (80%)🧮 2/3 ✓ 95%
27 (90%)🧮 2/3 ✓ 98%
30 (100%)🧮 2/3 ✓ 99%
EARTH_SPACESBST ✓ buzzed CORRECT · buzz @ word 12/18 (71% in)
What is the name of the circular-shaped bulges on Venus caused by upwellings 🔔 of magma below the surface?
gold answer: CORONAE
heardbot's guessP(correct)
0 (0%)— 1%
3 (18%)— 1%
6 (35%)— 1%
9 (53%)coronae ✓ 73%
12 (71%)Coronae ✓ 86% 🔔
15 (88%)coronae ✓ 94%
17 (100%)coronae ✓ 97%
PHYSICSNSBA2 ✓ buzzed CORRECT · buzz @ word 24/35 (71% in)
As a corollary of Snell’s law, light traveling between two media traces a path that minimizes its time of travel. What is the term for 🔔 this principle that applies more generally to any inhomogenous medium?
gold answer: FERMAT’S PRINCIPLE / PRINCIPLE OF LEAST TIME
heardbot's guessP(correct)
0 (0%)— 0%
3 (9%)— 0%
6 (18%)— 0%
9 (26%)Total internal reflection ✗ 45%
12 (35%)path of least time ✓ 55%
15 (44%)travel time ✗ 64%
18 (53%)Travel ✗ 73%
21 (62%)Fermat's principle ✓ 80%
24 (71%)Fermat's principle ✓ 89% 🔔
27 (79%)Fermat's principle ✓ 95%
30 (88%)Fermat's principle ✓ 97%
33 (97%)Fermat's principle ✓ 99%
34 (100%)Fermat's principle ✓ 99%
OTHERPrometheus 2021 ✓ buzzed CORRECT · buzz @ word 12/18 (71% in)
Which type of machine learning involves taking in pairs of inputs and outputs 🔔 to model an input-output function?
gold answer: Supervised learning
heardbot's guessP(correct)
0 (0%)— 0%
3 (18%)— 1%
6 (35%)— 1%
9 (53%)Supervised learning ✓ 70%
12 (71%)Supervised learning ✓ 85% 🔔
15 (88%)Supervised learning ✓ 93%
17 (100%)Supervised learning ✓ 97%
PHYSICSNSI_2024 ✓ buzzed CORRECT · buzz @ word 42/60 (71% in)
There are two trains moving toward each other. The train moving to the west has velocity 200 m/s and mass 60 kg. The one moving east has velocity 240 m/s and mass 100 kg. After colliding with one another, they stick together. In 🔔 meters per second, what is the velocity and direction at which the trains move after the collision?
gold answer: 75 m/s east
heardbot's guessP(correct)
0 (0%)— 0%
3 (5%)— 0%
6 (10%)— 0%
9 (15%)— 0%
12 (20%)— 0%
15 (25%)— 0%
18 (31%)— 0%
21 (36%)— 0%
24 (41%)— 0%
27 (46%)— 0%
30 (51%)— 0%
33 (56%)🧮 75 ✓ 37%
36 (61%)🧮 75 ✓ 55%
39 (66%)🧮 75 ✓ 71%
42 (71%)🧮 75 ✓ 83% 🔔
45 (76%)🧮 75 ✓ 91%
48 (81%)🧮 75 ✓ 95%
51 (86%)🧮 75 ✓ 98%
54 (92%)🧮 75 ✓ 99%
57 (97%)🧮 75 ✓ 99%
59 (100%)🧮 75 ✓ 100%
EARTH_SPACEDAST1 ✓ buzzed CORRECT · buzz @ word 33/47 (72% in)
Jupiter’s magnetic field is partially due to its liquid metallic hydrogen core. However, its moon, Io [I-O], more than doubles Jupiter’s magnetic field strength by emitting large amounts of sulfur dioxide, which gets swept 🔔 up in Jupiter’s magnetic sphere to form what object that surrounds the planet?
gold answer: IO PLASMA TORUS / IO TORUS OR PLASMA TORUS OR TORUS
heardbot's guessP(correct)
0 (0%)— 0%
3 (7%)— 0%
6 (13%)metallic hydrogen ✗ 35%
9 (20%)hydrogen ✗ 44%
12 (26%)— 0%
15 (33%)— 0%
18 (39%)— 0%
21 (46%)Magnetosphere ✗ 58%
24 (52%)— 1%
27 (59%)Sulfur dioxide ✗ 68%
30 (65%)plasma torus ✓ 76%
33 (72%)Io plasma torus ✓ 82% 🔔
36 (78%)magnetosphere ✗ 83%
39 (85%)plasma torus ✓ 84%
42 (91%)Io plasma torus ✓ 85%
45 (98%)Io plasma torus ✓ 92%
46 (100%)Plasma torus ✓ 86%
EARTH_SPACEMIT-2020 ✓ buzzed CORRECT · buzz @ word 36/51 (72% in)
By name or number, identify all of the following three statements that are TRUE of type 1a supernovae: 1) They are typically more luminous than type II supernovae 2) Their luminosity peaks are primarily due to the 🔔 decay of nickel-56 3) They are typically seen near regions of active star formation
gold answer: 1 and 2
heardbot's guessP(correct)
0 (0%)— 0%
3 (6%)— 0%
6 (12%)— 0%
9 (18%)— 0%
12 (24%)— 0%
15 (30%)— 0%
18 (36%)— 0%
21 (42%)— 0%
24 (48%)— 0%
27 (54%)1 and 2 ✓ 50%
30 (60%)1 and 2 ✓ 65%
33 (66%)1 and 2 ✓ 78%
36 (72%)1 and 2 ✓ 87% 🔔
39 (78%)1 and 2 ✓ 93%
42 (84%)1 and 2 ✓ 96%
45 (90%)1 and 2 ✓ 98%
48 (96%)1 and 2 ✓ 99%
50 (100%)1 and 2 ✓ 99%
ENERGYMIT-2024 ✓ buzzed CORRECT · buzz @ word 24/34 (73% in)
Scientists at MIT and Caltech’s LIGO collaboration used new lasers and mirrors to vastly improve their gravitational wave measurements. These instruments are part of what 🔔 general technique used by LIGO to measure gravitational waves?
gold answer: Interferometry
heardbot's guessP(correct)
0 (0%)— 0%
3 (9%)— 0%
6 (18%)Gravitational waves ✗ 54%
9 (27%)— 1%
12 (36%)— 1%
15 (45%)gravitational wave detector ✗ 69%
18 (55%)— 1%
21 (64%)interferometers ✓ 79%
24 (73%)interferometer ✓ 84% 🔔
27 (82%)Interferometry ✓ 88%
30 (91%)Interferometry ✓ 94%
33 (100%)Laser interferometry ✓ 93%
ENERGYMoose ✓ buzzed CORRECT · buzz @ word 24/34 (73% in)
Researchers at the Department of Energy’s DIII-D National Fusion Facility have discovered new properties of plasmas by studying what magnetic field oscillations propagated throughout plasmas 🔔 that give rise to phenomena such as the auroras?
gold answer: ALFVÉN WAVES
heardbot's guessP(correct)
0 (0%)— 0%
3 (9%)— 0%
6 (18%)— 1%
9 (27%)— 1%
12 (36%)— 1%
15 (45%)— 1%
18 (55%)— 1%
21 (64%)Alfvén waves ✓ 72%
24 (73%)Alfvén waves ✓ 84% 🔔
27 (82%)Alfvén waves ✓ 92%
30 (91%)Alfvén waves ✓ 96%
33 (100%)Alfvén waves ✓ 98%
ENERGYrandom ✓ buzzed CORRECT · buzz @ word 30/42 (73% in)
Pacific Northwest National Laboratory scientists are studying secondary organic aerosols, which are distinguished from primary organic aerosols in that they only enter the solid phase once they undergo chemical reactions in 🔔 the atmosphere. Prior to this, in what phase are those molecules?
gold answer: GAS
heardbot's guessP(correct)
0 (0%)— 0%
3 (7%)— 0%
6 (15%)— 0%
9 (22%)— 0%
12 (29%)— 0%
15 (37%)— 0%
18 (44%)they are formed in the atmosphere ✗ 57%
21 (51%)the atmosphere as gases ✓ 65%
24 (59%)— 1%
27 (66%)chemical reactions ✗ 75%
30 (73%)the atmosphere ✓ 81% 🔔
33 (80%)— 2%
36 (88%)— 2%
39 (95%)Gas phase ✓ 88%
41 (100%)Gas ✓ 91%
PHYSICStexas_sci_bowl_2025 ✓ buzzed CORRECT · buzz @ word 27/37 (75% in)
Sound waves may be modelled as the compression and expansion of air molecules. For frequencies in the human hearing range, what characteristic best describes these processes in sound 🔔 waves? W) Isobaric X) Isochoric Y) Isothermal Z) Adiabatic
gold answer: Z) Adiabatic
heardbot's guessP(correct)
0 (0%)— 0%
3 (8%)— 0%
6 (17%)— 0%
9 (25%)longitudinal waves ✗ 50%
12 (33%)— 1%
15 (42%)— 1%
18 (50%)— 1%
21 (58%)— 1%
24 (67%)adiabatic ✓ 70%
27 (75%)Adiabatic ✓ 84% 🔔
30 (83%)Adiabatic ✓ 92%
33 (92%)Adiabatic ✓ 96%
36 (100%)Adiabatic ✓ 98%
ENERGYMIT-2025 ✓ buzzed CORRECT · buzz @ word 18/25 (75% in)
The Broderick Group is studying parametric distributions, such as the normal distribution. How many parameters are required to completely 🔔 specify a 1 dimensional normal distribution?
gold answer: 2
heardbot's guessP(correct)
0 (0%)— 1%
3 (12%)— 1%
6 (25%)— 1%
9 (38%)— 1%
12 (50%)— 1%
15 (62%)2 ✓ 80%
18 (75%)2 ✓ 90% 🔔
21 (88%)2 ✓ 95%
24 (100%)2 ✓ 98%
EARTH_SPACEWSBT ✓ buzzed CORRECT · buzz @ word 15/21 (75% in)
Identify all of the following three types of wind that are downslope winds: 1) Valley breeze; 🔔 2) katabatic wind; 3) chinook.
gold answer: 2 AND 3 Tony VISUAL
heardbot's guessP(correct)
0 (0%)— 0%
3 (15%)— 1%
6 (30%)— 1%
9 (45%)— 1%
12 (60%)— 1%
15 (75%)2 and 3 ✓ 81% 🔔
18 (90%)2 and 3 ✓ 91%
20 (100%)2 and 3 ✓ 96%
BIOLOGYCCWTWO ✓ buzzed CORRECT · buzz @ word 6/9 (75% in)
What vitamin is a part of acetyl 🔔 coenzyme A?
gold answer: VITAMIN B5 / PANTOTHENIC ACID
heardbot's guessP(correct)
0 (0%)— 1%
3 (38%)— 2%
6 (75%)Vitamin B5 ✓ 92% 🔔
8 (100%)Vitamin B5 ✓ 97%
CHEMISTRYCSBL ✓ buzzed CORRECT · buzz @ word 12/17 (75% in)
Compounds that have L and D isomers exhibit what type of isomerism, characterized 🔔 by non-superimposable mirror images?
gold answer: ENANTIOMERISM / OPTICAL ISOMERISM; CHIRALITY
heardbot's guessP(correct)
0 (0%)— 0%
3 (19%)— 0%
6 (38%)Chiral compounds ✓ 58%
9 (56%)Chirality ✓ 71%
12 (75%)Optical isomerism ✓ 81% 🔔
15 (94%)Enantiomerism ✓ 88%
16 (100%)Enantiomerism ✓ 94%
EARTH_SPACENWI-2025 ✓ buzzed CORRECT · buzz @ word 21/29 (75% in)
The cosmological principle suggests that the universe fits which of the following descriptions? W) Isotropic and homogeneous X) Isotropic and heterogeneous Y) 🔔 Anisotropic and homogeneous Z) Anisotropic and heterogeneous
gold answer: W) Isotropic and homogeneous
heardbot's guessP(correct)
0 (0%)— 0%
3 (11%)— 0%
6 (21%)— 0%
9 (32%)homogeneous and isotropic ✓ 56%
12 (43%)Homogeneous and isotropic ✓ 73%
15 (54%)Homogeneous ✗ 69%
18 (64%)W) Isotropic and homogeneous ✓ 78%
21 (75%)W) Isotropic and homogeneous ✓ 88% 🔔
24 (86%)W ✓ 86%
27 (96%)W ✓ 93%
28 (100%)W ✓ 96%
CHEMISTRYSMH-2025 ✓ buzzed CORRECT · buzz @ word 15/21 (75% in)
Dry ice and table sugar are examples of what type of solid, composed of individual molecules 🔔 held together by intermolecular interactions?
gold answer: molecular
heardbot's guessP(correct)
0 (0%)— 0%
3 (15%)— 0%
6 (30%)molecular solids ✓ 56%
9 (45%)Molecular solids ✓ 75%
12 (60%)Molecular solid ✓ 72%
15 (75%)Molecular solid ✓ 87% 🔔
18 (90%)Molecular solid ✓ 94%
20 (100%)Molecular solid ✓ 97%
CHEMISTRYDasoni Standard1 ✓ buzzed CORRECT · buzz @ word 6/9 (75% in)
What reaction order has a half-life independent 🔔 of concentration?
gold answer: FIRST / ONE
heardbot's guessP(correct)
0 (0%)— 1%
3 (38%)— 1%
6 (75%)First order ✓ 85% 🔔
8 (100%)First order ✓ 94%
MATHSMH-2025 ✓ buzzed CORRECT · buzz @ word 36/48 (77% in)
The piecewise function f is defined such that f(x) = 3x for x less than k and f(x) = 6x - 18 for x greater than or equal to k, where k is a fixed constant. If 🔔 the function is continuous everywhere, what is the value of k?
gold answer: 6
heardbot's guessP(correct)
0 (0%)— 0%
3 (6%)— 0%
6 (13%)— 0%
9 (19%)— 0%
12 (26%)— 0%
15 (32%)— 0%
18 (38%)— 0%
21 (45%)🧮 6 ✓ 20%
24 (51%)🧮 6 ✓ 32%
27 (57%)🧮 6 ✓ 48%
30 (64%)🧮 6 ✓ 64%
33 (70%)🧮 6 ✓ 77%
36 (77%)🧮 6 ✓ 87% 🔔
39 (83%)🧮 6 ✓ 93%
42 (89%)🧮 6 ✓ 96%
45 (96%)🧮 6 ✓ 98%
47 (100%)🧮 6 ✓ 99%
EARTH_SPACEMIT-2023 ✓ buzzed CORRECT · buzz @ word 33/44 (77% in)
Identify all of the following four statements are not true of the moons of Mars: 1) Phobos lies in a stable orbit 2) Deimos is the largest martian moon 3) Phobos and Deimos are 🔔 in equatorial orbits 4) Deimos’s composition resembles the asteroid Ceres
gold answer: 1 and 2
heardbot's guessP(correct)
0 (0%)— 0%
3 (7%)— 0%
6 (14%)— 0%
9 (21%)— 0%
12 (28%)— 0%
15 (35%)— 0%
18 (42%)— 0%
21 (49%)— 0%
24 (56%)1 and 3 ✗ 52%
27 (63%)1 and 2 ✓ 60%
30 (70%)1 and 2 ✓ 77%
33 (77%)1 and 2 ✓ 88% 🔔
36 (84%)1 and 2 ✓ 94%
39 (91%)1 and 2 ✓ 97%
42 (98%)1 and 2 ✓ 99%
43 (100%)Let me analyze each statement: ✓ 77%
PHYSICSTHUMB-2025 ✓ buzzed CORRECT · buzz @ word 30/40 (77% in)
Alexander pushes a 10-kilogram box across a floor with a constant force of 20 Newtons. If the box moves at a constant velocity of 5 meters per second, then in watts, 🔔 what is the power being delivered by the person?
gold answer: 100
heardbot's guessP(correct)
0 (0%)— 0%
3 (8%)— 0%
6 (15%)— 0%
9 (23%)— 0%
12 (31%)— 0%
15 (38%)— 0%
18 (46%)— 0%
21 (54%)🧮 1/5 ✗ 55%
24 (62%)🧮 100 ✓ 64%
27 (69%)🧮 100 ✓ 79%
30 (77%)🧮 100 ✓ 89% 🔔
33 (85%)🧮 100 ✓ 95%
36 (92%)🧮 100 ✓ 98%
39 (100%)🧮 100 ✓ 99%
PHYSICSSBST (Spring) ✓ buzzed CORRECT · buzz @ word 30/40 (77% in)
The Lennard-Jones potential contains terms of r, the distance between particles, to the negative 6th and 12th powers. Which of the following forces explains the r−12 term? W) Pauli repulsion X) 🔔 Coulomb forces Y) London dispersion forces Z) Dipole-dipole forces
gold answer: W) PAULI REPULSION
heardbot's guessP(correct)
0 (0%)— 0%
3 (8%)— 0%
6 (15%)— 0%
9 (23%)— 0%
12 (31%)The Lennard-Jones potential is V(r) ✗ 52%
15 (38%)negative 12th power ✗ 61%
18 (46%)— 1%
21 (54%)— 1%
24 (62%)Van der Waals force ✗ 73%
27 (69%)Pauli exclusion ✓ 80%
30 (77%)Pauli repulsion ✓ 85% 🔔
33 (85%)W) Pauli repulsion ✓ 89%
36 (92%)W) Pauli repulsion ✓ 95%
39 (100%)W) Pauli repulsion ✓ 97%
PHYSICSCast ✓ buzzed CORRECT · buzz @ word 27/36 (77% in)
While on Earth's surface, Bob exerts a force of 500 Newtons on the Earth. If the Earth is exactly 1023 times more massive than Bob, how much force 🔔 does the Earth exert on Bob, in newtons?
gold answer: 500
heardbot's guessP(correct)
0 (0%)— 0%
3 (9%)— 0%
6 (17%)— 0%
9 (26%)🧮 250/3 ✗ 48%
12 (34%)🧮 250/3 ✗ 67%
15 (43%)🧮 125 ✗ 60%
18 (51%)500 Newtons ✓ 71%
21 (60%)🧮 1/10000000000000000000000 ✗ 75%
24 (69%)500 Newtons ✓ 80%
27 (77%)🧮 500 ✓ 83% 🔔
30 (86%)🧮 500 ✓ 92%
33 (94%)🧮 500 ✓ 96%
35 (100%)🧮 500 ✓ 98%
PHYSICSSCB-2025 ✓ buzzed CORRECT · buzz @ word 21/28 (78% in)
A Carnot heat engine operates between a hot reservoir at 400 kelvins and a cold reservoir at 280 kelvins. What is the 🔔 maximum possible efficiency of this engine?
gold answer: 0.3
heardbot's guessP(correct)
0 (0%)— 0%
3 (11%)— 0%
6 (22%)— 0%
9 (33%)— 1%
12 (44%)— 1%
15 (56%)— 1%
18 (67%)🧮 3/10 ✓ 79%
21 (78%)🧮 3/10 ✓ 89% 🔔
24 (89%)🧮 3/10 ✓ 95%
27 (100%)🧮 3/10 ✓ 98%
BIOLOGYMIT-2025 ✓ buzzed CORRECT · buzz @ word 21/28 (78% in)
Brown adipose tissue is responsible for nonshivering thermogenesis. What protein in brown adipose tissue, which serves as a proton leak channel, is 🔔 responsible for this generation of heat?
gold answer: THERMOGENIN / UCP1
heardbot's guessP(correct)
0 (0%)— 0%
3 (11%)— 0%
6 (22%)thermogenesis ✗ 47%
9 (33%)Uncoupling protein 1 ✓ 59%
12 (44%)Uncoupling protein 1 ✓ 75%
15 (56%)Thermogenin ✓ 74%
18 (67%)Uncoupling protein 1 ✓ 77%
21 (78%)Uncoupling protein 1 ✓ 87% 🔔
24 (89%)Thermogenin ✓ 82%
27 (100%)Thermogenin ✓ 90%
CHEMISTRYBASED-2025 ✓ buzzed CORRECT · buzz @ word 36/47 (78% in)
Max is a real gas. Unfortunately, the Ideal Gas Law does not do a very good job at approximating Max's pressure under certain conditions. What equation, which accounts for the volume of the gas particles and intermolecular 🔔 forces, calculates a more accurate approximation for Max’s exerted pressure?
gold answer: VAN DER WAALS EQUATION
heardbot's guessP(correct)
0 (0%)— 0%
3 (7%)— 0%
6 (13%)— 0%
9 (20%)Van der Waals equation ✓ 22%
12 (26%)Van der Waals equation ✓ 36%
15 (33%)Van der Waals equation ✓ 54%
18 (39%)Van der Waals equation ✓ 71%
21 (46%)— 0%
24 (52%)— 0%
27 (59%)Van der Waals equation ✓ 34%
30 (65%)Van der Waals equation ✓ 51%
33 (72%)Van der Waals equation ✓ 69%
36 (78%)Van der Waals equation ✓ 82% 🔔
39 (85%)Van der Waals equation ✓ 90%
42 (91%)Van der Waals equation ✓ 95%
45 (98%)Van der Waals equation ✓ 98%
46 (100%)Van der Waals equation ✓ 99%
BIOLOGYSSBT-2023 ✓ buzzed CORRECT · buzz @ word 18/24 (78% in)
What is the name of the class of enzymes which catalyze the transfer of an amino acid to the 🔔 acceptor arm of a tRNA?
gold answer: AMINOACYL TRNA SYNTHETASE
heardbot's guessP(correct)
0 (0%)— 0%
3 (13%)— 0%
6 (26%)— 0%
9 (39%)— 1%
12 (52%)Transferases ✗ 61%
15 (65%)Aminotransferases ✗ 73%
18 (78%)Aminoacyl-tRNA synthetases ✓ 82% 🔔
21 (91%)Aminoacyl-tRNA synthetases ✓ 91%
23 (100%)Aminoacyl-tRNA synthetases ✓ 95%
CHEMISTRYBASIS Peoria Rounds ✓ buzzed CORRECT · buzz @ word 15/20 (79% in)
If 12 moles of Na react with 7 moles of chlorine gas, how many moles of 🔔 NaCl will be produced?
gold answer: 12 moles NaCl
heardbot's guessP(correct)
0 (0%)— 0%
3 (16%)— 0%
6 (32%)🧮 6 ✗ 49%
9 (47%)🧮 6 ✗ 70%
12 (63%)🧮 12 ✓ 66%
15 (79%)🧮 12 ✓ 83% 🔔
18 (95%)🧮 12 ✓ 92%
19 (100%)🧮 12 ✓ 96%
BIOLOGYMIT-2022 ✓ buzzed CORRECT · buzz @ word 15/20 (79% in)
What term describes the seeming impossibility of proteins randomly folding in seconds due to an astronomical 🔔 number of possible conformations?
gold answer: Levinthal’s paradox
heardbot's guessP(correct)
0 (0%)— 0%
3 (16%)— 0%
6 (32%)— 0%
9 (47%)Levinthal's paradox ✓ 61%
12 (63%)Levinthal's paradox ✓ 80%
15 (79%)Levinthal's paradox ✓ 91% 🔔
18 (95%)Levinthal's paradox ✓ 96%
19 (100%)Levinthal's paradox ✓ 98%
EARTH_SPACEStanford_2025 ✓ buzzed CORRECT · buzz @ word 15/20 (79% in)
Identify all of the following three planets that contain metallic hydrogen in their interior: 1) Jupiter; 🔔 2) Saturn; 3) Uranus.
gold answer: 1 and 2
heardbot's guessP(correct)
0 (0%)— 1%
3 (16%)— 1%
6 (32%)— 1%
9 (47%)— 1%
12 (63%)Jupiter and Saturn ✗ 79%
15 (79%)1 and 2 ✓ 86% 🔔
18 (95%)1 and 2 ✓ 94%
19 (100%)1 and 2 ✓ 97%
ENERGYSSBT-2023 ✓ buzzed CORRECT · buzz @ word 24/31 (80% in)
Researchers at Brookhaven National Lab recently discovered a vine with high levels of petroselinic acid, a useful monounsaturated fatty acid with formula C18H34O2. How many 🔔 double bonds does petroselinic acid contain?
gold answer: 2
heardbot's guessP(correct)
0 (0%)— 1%
3 (10%)— 1%
6 (20%)— 1%
9 (30%)— 1%
12 (40%)— 1%
15 (50%)— 1%
18 (60%)— 1%
21 (70%)— 1%
24 (80%)🧮 2 ✓ 82% 🔔
27 (90%)— 2%
30 (100%)🧮 2 ✓ 85%
PHYSICSWSBT ✓ buzzed CORRECT · buzz @ word 24/31 (80% in)
An ideal transformer has 28 coils in the primary winding and 42 coils in the secondary winding. If the source current is 210 A, then 🔔 what current does the transformer output?
gold answer: 140 A
heardbot's guessP(correct)
0 (0%)— 0%
3 (10%)— 0%
6 (20%)🧮 30 ✗ 64%
9 (30%)— 1%
12 (40%)— 1%
15 (50%)🧮 3/2 ✗ 77%
18 (60%)— 1%
21 (70%)— 1%
24 (80%)🧮 140 ✓ 86% 🔔
27 (90%)🧮 140 ✓ 93%
30 (100%)🧮 140 ✓ 97%
PHYSICSMOSFET-2 ✓ buzzed CORRECT · buzz @ word 12/16 (80% in)
Time dilation and length contraction both result from what theory, which relates space 🔔 and time? ​
gold answer: SPECIAL RELATIVITY / RELATIVITY
heardbot's guessP(correct)
0 (0%)— 1%
3 (20%)Special relativity ✓ 67%
6 (40%)— 2%
9 (60%)Special relativity ✓ 77%
12 (80%)Special relativity ✓ 89% 🔔
15 (100%)Special relativity ✓ 95%
CHEMISTRYSBL ✓ buzzed CORRECT · buzz @ word 12/16 (80% in)
Esters can be hydrolyzed under acidic conditions to form carboxylic acids and what 🔔 other functional group?
gold answer: ALCOHOL
heardbot's guessP(correct)
0 (0%)— 0%
3 (20%)— 1%
6 (40%)Fischer esterification ✗ 68%
9 (60%)acids ✗ 79%
12 (80%)Alcohols ✓ 87% 🔔
15 (100%)Alcohol ✓ 92%
ENERGYDeadbird Invitational ✓ buzzed CORRECT · buzz @ word 24/31 (80% in)
Researchers at Lawrence Livermore National Lab are studying the Tobacco mosaic virus and its structure. What is the name of the helical protein shell that 🔔 encloses the mosaic virus’ RNA molecule?
gold answer: CAPSID
heardbot's guessP(correct)
0 (0%)— 0%
3 (10%)— 0%
6 (20%)— 0%
9 (30%)Tobacco mosaic virus ✗ 56%
12 (40%)— 1%
15 (50%)— 1%
18 (60%)— 1%
21 (70%)capsid ✓ 76%
24 (80%)capsid ✓ 88% 🔔
27 (90%)Capsid ✓ 94%
30 (100%)Capsid ✓ 97%
BIOLOGYFE!M-2025 ✓ buzzed CORRECT · buzz @ word 24/31 (80% in)
Unlike most mesodermally derived bones in the body, teeth are primarily of ectodermal origin. This is because they are seeded by what group of cells 🔔 that are a byproduct of neurulation?
gold answer: Neural Crest cells 8
heardbot's guessP(correct)
0 (0%)— 0%
3 (10%)— 0%
6 (20%)— 0%
9 (30%)ectodermally derived ✗ 52%
12 (40%)Neural crest ✓ 62%
15 (50%)neural crest cells ✓ 71%
18 (60%)neural crest ✓ 74%
21 (70%)neural crest cells ✓ 77%
24 (80%)Neural crest cells ✓ 88% 🔔
27 (90%)Neural crest cells ✓ 94%
30 (100%)Neural crest cells ✓ 97%
MATHSBST ✓ buzzed CORRECT · buzz @ word 24/31 (80% in)
A rectangle is inscribed inside a circle with an area of 25π. Given that the rectangle’s length is double the length of its width, what 🔔 is the area of the rectangle?
gold answer: 40
heardbot's guessP(correct)
0 (0%)— 0%
3 (10%)— 0%
6 (20%)— 0%
9 (30%)— 0%
12 (40%)🧮 48 ✗ 24%
15 (50%)🧮 40 ✓ 32%
18 (60%)🧮 40 ✓ 51%
21 (70%)🧮 40 ✓ 70%
24 (80%)🧮 40 ✓ 84% 🔔
27 (90%)🧮 40 ✓ 92%
30 (100%)🧮 40 ✓ 96%
BIOLOGYrandom ✓ buzzed CORRECT · buzz @ word 12/16 (80% in)
What compound present in the bacterial cell walls facilitates trapping of crystal violet 🔔 during Gram staining?
gold answer: PEPTIDOGLYCAN
heardbot's guessP(correct)
0 (0%)— 1%
3 (20%)— 1%
6 (40%)— 1%
9 (60%)Peptidoglycan ✓ 75%
12 (80%)Peptidoglycan ✓ 87% 🔔
15 (100%)Peptidoglycan ✓ 94%
CHEMISTRYDAST1 ✓ buzzed CORRECT · buzz @ word 18/23 (82% in)
What is the term for molecules that lack chiral centers but are optically active due to steric hindrance around 🔔 a rotationally fixed bond?
gold answer: ATROPISOMERS
heardbot's guessP(correct)
0 (0%)— 0%
3 (14%)— 0%
6 (27%)— 0%
9 (41%)achiral ✗ 57%
12 (55%)Achiral ✗ 76%
15 (68%)axially chiral molecules... the answer is **atr ✗ 73%
18 (82%)Atropisomers ✓ 81% 🔔
21 (95%)Atropisomers ✓ 91%
22 (100%)Atropisomers ✓ 95%
EARTH_SPACEMIT-2020 ✓ buzzed CORRECT · buzz @ word 9/12 (82% in)
What is the name of the failed arm of a 🔔 triple junction?
gold answer: Aulacogen
heardbot's guessP(correct)
0 (0%)— 1%
3 (27%)— 2%
6 (55%)— 3%
9 (82%)Aulacogen ✓ 90% 🔔
11 (100%)Aulacogen ✓ 95%
CHEMISTRYCCWTWO ✓ buzzed CORRECT · buzz @ word 18/23 (82% in)
What is the name of the carbonyl condensation reaction that occurs when two esters are treated with a base 🔔 such as sodium ethoxide?
gold answer: Claisen Condensation
heardbot's guessP(correct)
0 (0%)— 0%
3 (14%)— 0%
6 (27%)— 0%
9 (41%)aldol condensation ✗ 61%
12 (55%)Aldol condensation ✗ 77%
15 (68%)Claisen condensation ✓ 74%
18 (82%)Claisen condensation ✓ 86% 🔔
21 (95%)Claisen condensation ✓ 93%
22 (100%)Claisen condensation ✓ 97%
EARTH_SPACEBASIS Peoria Rounds ✓ buzzed CORRECT · buzz @ word 15/19 (83% in)
What is the term for a mountain that is formed by the glacial weathering of the 🔔 rocks around it?
gold answer: HORN
heardbot's guessP(correct)
0 (0%)— 0%
3 (17%)— 1%
6 (33%)— 1%
9 (50%)— 1%
12 (67%)Horn ✓ 79%
15 (83%)Horn ✓ 90% 🔔
18 (100%)Horn ✓ 96%
CHEMISTRYMIT-2023 ✓ buzzed CORRECT · buzz @ word 15/19 (83% in)
When chlorine gas is bubbled into basic water, the chloride anion along with what other chlorine-containing 🔔 ion is formed?
gold answer: Hypochlorite anion / Hypochlorite; OCl−
heardbot's guessP(correct)
0 (0%)— 0%
3 (17%)— 0%
6 (33%)bleach ✗ 54%
9 (50%)— 1%
12 (67%)hypochlorite ✓ 71%
15 (83%)Hypochlorite ✓ 86% 🔔
18 (100%)Hypochlorite ✓ 94%
CHEMISTRYPrometheus 2023 ✓ buzzed CORRECT · buzz @ word 15/19 (83% in)
What is the name given to the non-zero entropy observed in an ensemble of particles cooled 🔔 to absolute zero?
gold answer: Residual entropy
heardbot's guessP(correct)
0 (0%)— 0%
3 (17%)— 0%
6 (33%)— 0%
9 (50%)Residual entropy ✓ 60%
12 (67%)Residual entropy ✓ 78%
15 (83%)Residual entropy ✓ 90% 🔔
18 (100%)Residual entropy ✓ 96%
OTHERDeadbird Invitational ✓ buzzed CORRECT · buzz @ word 36/44 (84% in)
Nayeon, a singer on the kpop band TWICE, is singing. When she is singing, small jets of air pass through moving vocal cords. What is the name for the measure of volume that describes how much air 🔔 is inhaled and exhaled with each breath?
gold answer: TIDAL VOLUME
heardbot's guessP(correct)
0 (0%)TWICE ✗ 32%
3 (7%)— 0%
6 (14%)TWICE ✗ 37%
9 (21%)— 0%
12 (28%)— 0%
15 (35%)— 0%
18 (42%)— 1%
21 (49%)cords ✗ 58%
24 (56%)— 1%
27 (63%)Bernoulli's principle ✗ 68%
30 (70%)— 1%
33 (77%)Loudness ✗ 77%
36 (84%)Tidal volume ✓ 83% 🔔
39 (91%)Tidal volume ✓ 91%
42 (98%)Tidal volume ✓ 96%
43 (100%)Tidal volume ✓ 98%
ENERGYDAST1 ✓ buzzed CORRECT · buzz @ word 48/58 (84% in)
Scientists at Brookhaven National La’s Center for Functional Nanomaterials need precise equipment in order to study the binding of SARS-CoV-2 [sars-co-vtwo] to cells and find a way to inhibit it. In order to accomplish this, they are using what microscopic technique that uses a usually pyramidal-shaped tip attached to 🔔 a cantilever [KANtuh-lee-ver] that can very finely scan surfaces?
gold answer: ATOMIC FORCE MICROSCOPY / SCANNING FORCE MICROSCOPY
heardbot's guessP(correct)
0 (0%)— 0%
3 (5%)— 0%
6 (11%)— 0%
9 (16%)— 0%
12 (21%)— 0%
15 (26%)— 0%
18 (32%)— 0%
21 (37%)— 0%
24 (42%)— 0%
27 (47%)— 0%
30 (53%)— 0%
33 (58%)— 0%
36 (63%)— 0%
39 (68%)electron microscope ✗ 58%
42 (74%)Cryo-electron microscopy ✗ 66%
45 (79%)Atomic Force Microscopy ✓ 73%
48 (84%)Atomic Force Microscopy ✓ 85% 🔔
51 (89%)Atomic force microscopy ✓ 92%
54 (95%)Atomic Force Microscopy ✓ 96%
57 (100%)Atomic force microscopy ✓ 98%
MATHdast-2025 ✓ buzzed CORRECT · buzz @ word 27/33 (84% in)
In Boolean algebra, a conjunction is a logical operator representing “and” whereas a disjunction is a logical operator representing “or”. What set of laws in Boolean algebra relate 🔔 conjunctions and disjunctions by negation?
gold answer: De Morgan’s Laws / De Morgan’s Theorems and WORD FORMS
heardbot's guessP(correct)
0 (0%)— 0%
3 (9%)— 0%
6 (19%)logical AND ✗ 21%
9 (28%)AND ✗ 28%
12 (38%)disjunction ✗ 37%
15 (47%)logical "or ✗ 47%
18 (56%)or ✗ 56%
21 (66%)— 1%
24 (75%)De Morgan's Laws ✓ 68%
27 (84%)De Morgan's Laws ✓ 82% 🔔
30 (94%)De Morgan's Laws ✓ 91%
32 (100%)De Morgan's Laws ✓ 95%
PHYSICSMIT-2022 ✓ buzzed CORRECT · buzz @ word 30/36 (86% in)
By name or number, identify all of the following three changes which would sharpen the resonance peak of a damped, driven harmonic oscillator: 1) Decreasing the damping 2) Increasing the mass 🔔 3) Decreasing the spring constant
gold answer: 1 and 2 / All but 3
heardbot's guessP(correct)
0 (0%)— 0%
3 (9%)— 0%
6 (17%)— 0%
9 (26%)— 0%
12 (34%)— 0%
15 (43%)— 0%
18 (51%)— 1%
21 (60%)— 1%
24 (69%)— 1%
27 (77%)1 and 2 ✓ 67%
30 (86%)1 and 2 ✓ 81% 🔔
33 (94%)1 and 2 ✓ 90%
35 (100%)1 and 2 ✓ 95%
BIOLOGYNSI_2024 ✓ buzzed CORRECT · buzz @ word 18/22 (86% in)
When epinephrine binds to adrenergic receptors and activates a G-protein coupled receptor, it converts ATP to cyclic AMP by 🔔 activating what enzyme?
gold answer: ADENYLYL CYCLASE / ADENYLATE CYCLASE
heardbot's guessP(correct)
0 (0%)— 0%
3 (14%)— 0%
6 (29%)— 1%
9 (43%)cAMP ✗ 61%
12 (57%)— 1%
15 (71%)cyclic AMP ✗ 77%
18 (86%)Adenylyl cyclase ✓ 85% 🔔
21 (100%)Adenylyl cyclase ✓ 93%
MATHWSBT ✓ buzzed CORRECT · buzz @ word 18/22 (86% in)
If 𝑥 ≡ 1 (mod 25) and 𝑥 ≡ 3 (mod 4), what is the remainder when x is 🔔 divided by 100?
gold answer: 51
heardbot's guessP(correct)
0 (0%)— 0%
3 (14%)— 0%
6 (29%)— 0%
9 (43%)— 0%
12 (57%)🧮 51 ✓ 44%
15 (71%)🧮 51 ✓ 64%
18 (86%)🧮 51 ✓ 81% 🔔
21 (100%)🧮 51 ✓ 91%
PHYSICSPrometheus 2023 ✓ buzzed CORRECT · buzz @ word 18/22 (86% in)
Compute the energy, in millijoules, stored in an inductor of inductance 5 millihenries with a current of 6 amperes 🔔 flowing through it.
gold answer: 90
heardbot's guessP(correct)
0 (0%)— 0%
3 (14%)— 1%
6 (29%)— 1%
9 (43%)— 1%
12 (57%)— 1%
15 (71%)— 1%
18 (86%)🧮 90 ✓ 82% 🔔
21 (100%)🧮 90 ✓ 91%
MATHMEHS Rounds ✓ buzzed CORRECT · buzz @ word 24/29 (86% in)
If the surface area of a cube is 600 square centimeters, give the volume of the cube, and express your answer in terms of cubic 🔔 centimeters. Page 7 TOSS-UP
gold answer: 1000
heardbot's guessP(correct)
0 (0%)— 0%
3 (11%)— 0%
6 (21%)— 0%
9 (32%)🧮 1000 ✓ 23%
12 (43%)— 0%
15 (54%)🧮 1000 ✓ 31%
18 (64%)🧮 1000 ✓ 50%
21 (75%)🧮 1000 ✓ 70%
24 (86%)🧮 1000 ✓ 84% 🔔
27 (96%)🧮 1000 ✓ 92%
28 (100%)🧮 1000 ✓ 96%
ENERGYNSBA1 ✓ buzzed CORRECT · buzz @ word 30/36 (86% in)
Researchers at Pacific Northwest National Lab are measuring recharge rates in aquifers by measuring the permeability of the aquifer and viscosity of the liquids. What equation in hydrology describes the movement 🔔 of groundwater in porous mediums?
gold answer: DARCY’S LAW
heardbot's guessP(correct)
0 (0%)— 0%
3 (9%)— 0%
6 (17%)— 0%
9 (26%)— 0%
12 (34%)— 0%
15 (43%)— 1%
18 (51%)— 1%
21 (60%)— 1%
24 (69%)Darcy's Law ✓ 64%
27 (77%)Darcy's Law ✓ 78%
30 (86%)Darcy's Law ✓ 88% 🔔
33 (94%)Darcy's Law ✓ 93%
35 (100%)Darcy's Law ✓ 96%
PHYSICSrandom ✓ buzzed CORRECT · buzz @ word 18/22 (86% in)
What is the term for a material that can be inserted between the slabs of a parallel-plate capacitor to 🔔 increase its capacitance?
gold answer: DIELECTRIC
heardbot's guessP(correct)
0 (0%)— 0%
3 (14%)— 1%
6 (29%)— 1%
9 (43%)— 1%
12 (57%)— 1%
15 (71%)— 1%
18 (86%)Dielectric ✓ 82% 🔔
21 (100%)Dielectric ✓ 92%
BIOLOGYIGNIS 2022 ✓ buzzed CORRECT · buzz @ word 21/25 (88% in)
Whether a muscle is fast or slow twitch is determined by the activity of an ATP hydrolysing enzyme. This ATP is attached 🔔 to what molecule?
gold answer: Myosin
heardbot's guessP(correct)
0 (0%)— 0%
3 (12%)— 0%
6 (25%)myosin heavy chain ✓ 47%
9 (38%)— 1%
12 (50%)myosin ATPase ✓ 62%
15 (62%)ATPase ✗ 71%
18 (75%)Myosin ATPase ✓ 75%
21 (88%)Myosin ATPase ✓ 87% 🔔
24 (100%)Myosin ✓ 84%
MATHFE!M-2025 ✓ buzzed CORRECT · buzz @ word 51/59 (88% in)
An unfair coin has a 23 chance of coming up heads, a 16 chance of landing on its side, and a 61 chance of coming up tails. Theenash flips the coin. He wins if it lands heads, loses if it lands tails, and reflips the coin if it lands on its side. 🔔 What is the probability that Theenash wins?
gold answer: 45
heardbot's guessP(correct)
0 (0%)— 0%
3 (5%)— 0%
6 (10%)— 0%
9 (16%)🧮 4/9 ✗ 8%
12 (21%)🧮 4/5 ✓ 10%
15 (26%)— 0%
18 (31%)— 0%
21 (36%)🧮 4/5 ✓ 13%
24 (41%)🧮 1/6 ✗ 17%
27 (47%)— 0%
30 (52%)🧮 4/5 ✓ 19%
33 (57%)— 0%
36 (62%)🧮 2/3 ✗ 26%
39 (67%)🧮 4/5 ✓ 28%
42 (72%)🧮 4/5 ✓ 45%
45 (78%)🧮 4/5 ✓ 62%
48 (83%)🧮 4/5 ✓ 77%
51 (88%)🧮 4/5 ✓ 87% 🔔
54 (93%)🧮 4/5 ✓ 93%
57 (98%)🧮 4/5 ✓ 97%
58 (100%)🧮 4/5 ✓ 98%
PHYSICSCSBL ✓ buzzed CORRECT · buzz @ word 15/18 (88% in)
When a car drives along a road, the absence of what force can cause slipping on 🔔 the wheels?
gold answer: FRICTION / STATIC FRICTION; DO NOT ACCEPT: KINETIC FRICTION
heardbot's guessP(correct)
0 (0%)— 1%
3 (18%)— 1%
6 (35%)— 1%
9 (53%)— 1%
12 (71%)friction ✓ 77%
15 (88%)Friction ✓ 88% 🔔
17 (100%)Static friction ✓ 88%
ENERGYMIT-2020 ✓ buzzed CORRECT · buzz @ word 39/45 (89% in)
Researchers in the Buchwald group at MIT are interested in developing next-generation ligands. To this end, they are employing organometallic coupling chemistry in order to generate ligands that are constrained in rotation about single bonds by steric effects. What form 🔔 of isomerism does this cause?
gold answer: Atropisomerism
heardbot's guessP(correct)
0 (0%)— 0%
3 (7%)— 0%
6 (14%)— 0%
9 (20%)— 0%
12 (27%)— 0%
15 (34%)— 0%
18 (41%)— 0%
21 (48%)— 0%
24 (55%)— 0%
27 (61%)— 1%
30 (68%)— 1%
33 (75%)Atropisomers ✓ 60%
36 (82%)Atropisomers ✓ 74%
39 (89%)Atropisomers ✓ 85% 🔔
42 (95%)Atropisomerism ✓ 74%
44 (100%)Atropisomerism ✓ 84%
PHYSICSMIT-2024 ✓ buzzed CORRECT · buzz @ word 24/28 (89% in)
Magnetically sensitive dyes are used in spectral imaging because they produce split spectral lines in the presence of a magnetic field. What effect is responsible 🔔 for this phenomenon?
gold answer: Zeeman
heardbot's guessP(correct)
0 (0%)— 0%
3 (11%)— 0%
6 (22%)— 0%
9 (33%)— 0%
12 (44%)Zeeman effect ✓ 57%
15 (56%)Zeeman effect ✓ 73%
18 (67%)magnetic field ✗ 72%
21 (78%)Zeeman effect ✓ 75%
24 (89%)Zeeman effect ✓ 86% 🔔
27 (100%)Zeeman effect ✓ 93%
ENERGYNSI_2024 ✓ buzzed CORRECT · buzz @ word 24/28 (89% in)
Researchers are using graph based models to represent traffic dynamics in densely populated cities. What word describes a graph where each node is connected to 🔔 every other node?
gold answer: Complete
heardbot's guessP(correct)
0 (0%)— 0%
3 (11%)— 0%
6 (22%)— 1%
9 (33%)— 1%
12 (44%)— 1%
15 (56%)— 1%
18 (67%)— 1%
21 (78%)— 1%
24 (89%)complete ✓ 81% 🔔
27 (100%)Complete ✓ 91%
MATHCCWTWO ✓ buzzed CORRECT · buzz @ word 9/11 (90% in)
How many numbers less than 100 are relatively prime to 🔔 100?
gold answer: 40
heardbot's guessP(correct)
0 (0%)— 0%
3 (30%)— 0%
6 (60%)🧮 40 ✓ 69%
9 (90%)🧮 40 ✓ 85% 🔔
10 (100%)🧮 40 ✓ 92%
EARTH_SPACEBTHS-2025 ✓ buzzed CORRECT · buzz @ word 9/11 (90% in)
What type of rock is formed from the solidification of 🔔 magma?
gold answer: Igneous
heardbot's guessP(correct)
0 (0%)— 1%
3 (30%)— 2%
6 (60%)— 3%
9 (90%)igneous ✓ 92% 🔔
10 (100%)Igneous ✓ 96%
MATHMoose ✓ buzzed CORRECT · buzz @ word 27/31 (90% in)
The point A (4, 6) is reflected over the line y = x to point B. What is the area of the triangle formed by points A, B, 🔔 and the origin?
gold answer: 10
heardbot's guessP(correct)
0 (0%)— 0%
3 (10%)— 0%
6 (20%)— 0%
9 (30%)🧮 (Fraction(6, 1), Fraction(4, 1)) ✗ 31%
12 (40%)🧮 (6, 4) ✗ 40%
15 (50%)🧮 (6, 4) ✗ 59%
18 (60%)🧮 2.828 ✗ 53%
21 (70%)🧮 10 ✓ 63%
24 (80%)🧮 10 ✓ 78%
27 (90%)🧮 10 ✓ 88% 🔔
30 (100%)🧮 10 ✓ 94%
MATHAVES-2025 ✓ buzzed CORRECT · buzz @ word 45/51 (90% in)
Gaurav has triangle ABC and he finds points X, Y, and Z outside the triangle such that BCX, ACY, and ABZ are equilateral. The intersection of AX, BY, and CZ is what point, which has the property that the sum of the distances from the vertices 🔔 to the point is minimized?
gold answer: Fermat point
heardbot's guessP(correct)
0 (0%)— 0%
3 (6%)— 0%
6 (12%)— 0%
9 (18%)— 0%
12 (24%)— 0%
15 (30%)— 0%
18 (36%)— 0%
21 (42%)— 0%
24 (48%)— 0%
27 (54%)Napoleon point ✗ 12%
30 (60%)The outer Napoleon point ✗ 15%
33 (66%)Fermat point ✓ 20%
36 (72%)Fermat point ✓ 34%
39 (78%)Fermat point ✓ 52%
42 (84%)Fermat point ✓ 69%
45 (90%)Fermat point ✓ 82% 🔔
48 (96%)Fermat point ✓ 91%
50 (100%)Fermat point ✓ 95%
ENERGYDasoni Comp1 ✓ buzzed CORRECT · buzz @ word 27/31 (90% in)
Davidson HS B Team members are studying hadrons. They hate free hadrons and love watching them decay. What free hadron is least satisfying to watch, as it does 🔔 not decay quickly?
gold answer: PROTON
heardbot's guessP(correct)
0 (0%)— 0%
3 (10%)— 0%
6 (20%)— 0%
9 (30%)— 1%
12 (40%)— 1%
15 (50%)— 1%
18 (60%)— 1%
21 (70%)neutron ✗ 72%
24 (80%)— 2%
27 (90%)The proton ✓ 82% 🔔
30 (100%)proton ✓ 87%
MATHLexSciBowl ✓ buzzed CORRECT · buzz @ word 21/24 (91% in)
Given that the areas of the faces of a rectangular prism are 6, 8, and 12, what is the volume of the 🔔 rectangular prism?
gold answer: 24
heardbot's guessP(correct)
0 (0%)— 0%
3 (13%)— 0%
6 (26%)— 0%
9 (39%)— 0%
12 (52%)🧮 30 ✗ 39%
15 (65%)🧮 24 ✓ 50%
18 (78%)🧮 24 ✓ 70%
21 (91%)🧮 24 ✓ 84% 🔔
23 (100%)🧮 24 ✓ 92%
MATHSBST (Spring) ✓ buzzed CORRECT · buzz @ word 21/24 (91% in)
In how many ways can 21 identical marbles be distributed amongst 7 people such that no two people have the same number 🔔 of marbles?
gold answer: 5040
heardbot's guessP(correct)
0 (0%)— 0%
3 (13%)— 0%
6 (26%)🧮 253 ✗ 29%
9 (39%)🧮 2024 ✗ 40%
12 (52%)🧮 296010 ✗ 51%
15 (65%)— 1%
18 (78%)🧮 5040 ✓ 67%
21 (91%)🧮 5040 ✓ 82% 🔔
23 (100%)— 2%
ENERGYWISC-2021 ✓ buzzed CORRECT · buzz @ word 33/37 (92% in)
Scientists at the Technical University of Munich are researching materials for information storage. What type of magnetic materials are they studying, in which the atoms, which behave as tiny magnets, are aligned in an 🔔 antiparallel arrangement? [SA]
gold answer: ANTIFERROMAGNETS
heardbot's guessP(correct)
0 (0%)— 0%
3 (8%)— 0%
6 (17%)— 0%
9 (25%)— 1%
12 (33%)— 1%
15 (42%)— 1%
18 (50%)— 1%
21 (58%)— 1%
24 (67%)antiferromagnetic materials ✓ 70%
27 (75%)— 1%
30 (83%)Antiferromagnetic materials ✓ 74%
33 (92%)Antiferromagnetic materials ✓ 86% 🔔
36 (100%)Antiferromagnetic materials ✓ 93%
MATHTHUMB-2025 ✓ buzzed CORRECT · buzz @ word 24/27 (92% in)
According to the rational root theorem, which of the following values could be a root of the polynomial 2x^2+14x+12? W) 5 X) 6 Y) 7 🔔 Z) 8
gold answer: X) 6
heardbot's guessP(correct)
0 (0%)— 0%
3 (12%)Rational Root Theorem ✗ 31%
6 (23%)— 0%
9 (35%)— 0%
12 (46%)— 0%
15 (58%)— 0%
18 (69%)🧮 -6 ✗ 54%
21 (81%)🧮 -6 ✗ 73%
24 (92%)🧮 6 ✓ 86% 🔔
26 (100%)🧮 6 ✓ 93%
EARTH_SPACETHUMB-2025 ✓ buzzed CORRECT · buzz @ word 24/27 (92% in)
Identify all of the following three astronomical phenomenon that are commonly used as spiral tracers: 1) Type II supernovae 2) H-II (read: H-two) regions 3) 🔔 K-type stars
gold answer: 1 and 2
heardbot's guessP(correct)
0 (0%)— 0%
3 (12%)— 0%
6 (23%)— 0%
9 (35%)— 1%
12 (46%)— 1%
15 (58%)— 1%
18 (69%)All three ✗ 71%
21 (81%)1 and 2 ✓ 79%
24 (92%)1 and 2 ✓ 90% 🔔
26 (100%)1 and 2 ✓ 95%
BIOLOGYBTHS-2025 ✓ buzzed CORRECT · buzz @ word 27/30 (93% in)
Organisms in the phylum Cnidaria (Read as: “nih-DAIR-ee-uh”) are found during, and can sometimes alternate between, two main life stages, or body forms. What are the names of 🔔 these forms?
gold answer: Polyp and Medusa
heardbot's guessP(correct)
0 (0%)— 0%
3 (10%)— 0%
6 (21%)— 0%
9 (31%)— 0%
12 (41%)— 1%
15 (52%)— 1%
18 (62%)Polyp and medusa ✓ 66%
21 (72%)plans ✗ 74%
24 (83%)Polyp and medusa ✓ 77%
27 (93%)Polyp and medusa ✓ 88% 🔔
29 (100%)Polyp and medusa ✓ 94%
CHEMISTRYRandom Stuff ✓ buzzed CORRECT · buzz @ word 15/17 (94% in)
What is the name of the effect of cooling a real gas by expansion through a 🔔 throttle?
gold answer: JOULE-THOMSON EFFECT
heardbot's guessP(correct)
0 (0%)— 0%
3 (19%)— 1%
6 (38%)— 1%
9 (56%)— 1%
12 (75%)Joule-Thomson effect ✓ 74%
15 (94%)Joule-Thomson effect ✓ 86% 🔔
16 (100%)Joule-Thomson effect ✓ 92%
MATHtexas_sci_bowl_2025 ✓ buzzed CORRECT · buzz @ word 15/17 (94% in)
A regular polygon has an internal angle of 177 degrees. How many side lengths does it 🔔 have?
gold answer: 120
heardbot's guessP(correct)
0 (0%)— 0%
3 (19%)— 0%
6 (38%)— 0%
9 (56%)🧮 120 ✓ 52%
12 (75%)🧮 120 ✓ 73%
15 (94%)🧮 120 ✓ 87% 🔔
16 (100%)🧮 120 ✓ 93%
BIOLOGYTHUMB-2025 ✓ buzzed CORRECT · buzz @ word 15/17 (94% in)
Ishank the rat is an r-selected species. R-selected species tend to follow what type of survivorship 🔔 curve?
gold answer: Type III / three
heardbot's guessP(correct)
0 (0%)— 0%
3 (19%)— 0%
6 (38%)— 1%
9 (56%)— 1%
12 (75%)J-shaped growth curve ✗ 74%
15 (94%)Type III ✓ 83% 🔔
16 (100%)Type III ✓ 91%
CHEMISTRYNSI_2024 ✓ buzzed CORRECT · buzz @ word 18/20 (95% in)
Identify all of the following four orbitals which have zero radial nodes: 1) 2s, 2) 2p, 3) 3p, 4) 🔔 3d
gold answer: 2 AND 4
heardbot's guessP(correct)
0 (0%)— 0%
3 (16%)— 0%
6 (32%)— 1%
9 (47%)— 1%
12 (63%)— 1%
15 (79%)— 1%
18 (95%)🧮 2 and 4 ✓ 81% 🔔
19 (100%)🧮 2, 4 ✓ 87%
EARTH_SPACESMH-2025 ✓ buzzed CORRECT · buzz @ word 18/20 (95% in)
Identify all of the following three spectral classes that are described as red dwarfs: 1) A; 2) G; 3) 🔔 M.
gold answer: 3 only
heardbot's guessP(correct)
0 (0%)— 0%
3 (16%)— 1%
6 (32%)— 1%
9 (47%)— 1%
12 (63%)— 1%
15 (79%)2 and 3 ✗ 79%
18 (95%)3 only ✓ 86% 🔔
19 (100%)3) M ✓ 89%
CHEMISTRYrandom ✓ buzzed CORRECT · buzz @ word 18/20 (95% in)
The strongest hydrogen bonds are typically thought to form only when hydrogen is bonded to one of what three 🔔 atoms?
gold answer: NITROGEN, OXYGEN, AND FLUORINE / N, O, AND F
heardbot's guessP(correct)
0 (0%)— 0%
3 (16%)— 0%
6 (32%)fluorine ✗ 51%
9 (47%)— 1%
12 (63%)bonded to fluorine, oxygen, or nitrogen ✗ 69%
15 (79%)fluorine, oxygen, or nitrogen ✓ 78%
18 (95%)Fluorine, oxygen, and nitrogen ✓ 86% 🔔
19 (100%)Fluorine, oxygen, and nitrogen ✓ 92%
MATHIGNIS 2022 ✓ buzzed CORRECT · buzz @ word 18/20 (95% in)
What probability distribution is used to model the number of times a certain event occurs within a fixed time 🔔 interval?
gold answer: Poisson distribution
heardbot's guessP(correct)
0 (0%)— 0%
3 (16%)— 0%
6 (32%)— 0%
9 (47%)Poisson distribution ✓ 40%
12 (63%)Poisson distribution ✓ 60%
15 (79%)Poisson distribution ✓ 78%
18 (95%)Poisson distribution ✓ 89% 🔔
19 (100%)Poisson distribution ✓ 94%
BIOLOGYSBL ✓ buzzed CORRECT · buzz @ word 18/20 (95% in)
Identify all of the following three organelles that are enclosed by a double membrane: 1) Nucleus; 2) Glyoxysome; 3) 🔔 Chloroplast.
gold answer: 1 AND 3
heardbot's guessP(correct)
0 (0%)— 0%
3 (16%)— 1%
6 (32%)— 1%
9 (47%)— 1%
12 (63%)— 1%
15 (79%)1 and 2 ✗ 77%
18 (95%)1 and 3 ✓ 84% 🔔
19 (100%)1 and 3 ✓ 91%
CHEMISTRYWSBT ✓ buzzed CORRECT · buzz @ word 21/23 (95% in)
What element, found in nature as a sulfide, can be added to improve the rigidity of lead alloy plates in lead acid 🔔 batteries?
gold answer: ANTIMONY
heardbot's guessP(correct)
0 (0%)— 0%
3 (14%)— 0%
6 (27%)— 0%
9 (41%)— 1%
12 (55%)— 1%
15 (68%)Sulfur ✗ 67%
18 (82%)Antimony ✓ 76%
21 (95%)Antimony ✓ 88% 🔔
22 (100%)Antimony ✓ 94%
CHEMISTRYFE!M-2025 ✓ buzzed CORRECT · buzz @ word 21/23 (95% in)
Advaith is setting up a galvanic cell and is attempting to calculate the electromotive force. What equation can he use to do 🔔 this?
gold answer: Nernst Equation 13
heardbot's guessP(correct)
0 (0%)— 0%
3 (14%)— 0%
6 (27%)— 0%
9 (41%)— 1%
12 (55%)— 1%
15 (68%)— 1%
18 (82%)Nernst equation ✓ 74%
21 (95%)Nernst equation ✓ 87% 🔔
22 (100%)Nernst equation ✓ 93%
CHEMISTRYMHS Rounds ✓ buzzed CORRECT · buzz @ word 21/23 (95% in)
Identify all of the following 3 reagents that would create a cis epoxide from a cis alkene: 1) mCPBA; 2) MMPP; 3) 🔔 DMSO.
gold answer: 1 AND 2
heardbot's guessP(correct)
0 (0%)— 0%
3 (14%)— 0%
6 (27%)— 0%
9 (41%)— 1%
12 (55%)— 1%
15 (68%)— 1%
18 (82%)1 and 2 ✓ 71%
21 (95%)1 and 2 ✓ 84% 🔔
22 (100%)1 and 2 ✓ 91%
ENERGYCSBL ✓ buzzed CORRECT · buzz @ word 48/51 (96% in)
Researchers at Pacific Northwest National Lab have designed a chip-sized sensor to detect toxic polyfluoroalkyl substances, or PFAS, which do not break down naturally and can repel water and oils. Identify all of the following three products that PFAS is commonly used in: 1) Non-stick pans; 2) Food packaging; 🔔 3) Silverware.
gold answer: 1 AND 2
heardbot's guessP(correct)
0 (0%)— 0%
3 (6%)— 0%
6 (12%)— 0%
9 (18%)— 0%
12 (24%)— 0%
15 (30%)PFAS ✗ 47%
18 (36%)— 0%
21 (42%)— 1%
24 (48%)— 1%
27 (54%)— 1%
30 (60%)— 1%
33 (66%)— 1%
36 (72%)— 1%
39 (78%)— 1%
42 (84%)— 1%
45 (90%)1 and 2 and 3 ✗ 75%
48 (96%)1 and 2 ✓ 81% 🔔
50 (100%)1 and 2 ✓ 89%
PHYSICSBerkeley-2023 ✓ buzzed CORRECT · buzz @ word 27/29 (96% in)
Identify all of the following three assumptions that must be made when considering an ideal fluid: 1) Fluids are nonviscous; 2) Fluids are compressible; 3) Fluid flow is 🔔 irrotational.
gold answer: 1 AND 3
heardbot's guessP(correct)
0 (0%)— 0%
3 (11%)— 0%
6 (21%)— 1%
9 (32%)— 1%
12 (43%)— 1%
15 (54%)— 1%
18 (64%)— 1%
21 (75%)All three ✗ 72%
24 (86%)1 and 3 ✓ 79%
27 (96%)1 and 3 ✓ 89% 🔔
28 (100%)1 and 3 ✓ 94%
MATHRandom Stuff ✓ buzzed CORRECT · buzz @ word 42/44 (98% in)
The position of a particle constrained to move on the y-axis is described by y=½kt2+4t, where t=time and k is an unknown constant. If the velocity of the particle at time t=5s is 24m/s, what is the value of k? No units are 🔔 necessary.
gold answer: K=4
heardbot's guessP(correct)
0 (0%)— 0%
3 (7%)— 0%
6 (14%)— 0%
9 (21%)— 0%
12 (28%)— 0%
15 (35%)— 0%
18 (42%)— 0%
21 (49%)— 0%
24 (56%)— 0%
27 (63%)🧮 2 ✗ 25%
30 (70%)🧮 2 ✗ 41%
33 (77%)🧮 4 ✓ 35%
36 (84%)🧮 4 ✓ 53%
39 (91%)🧮 4 ✓ 70%
42 (98%)🧮 4 ✓ 83% 🔔
43 (100%)🧮 4 ✓ 90%
ENERGYMIT-2021 ✓ buzzed CORRECT · buzz @ word 48/50 (98% in)
Researchers in the Movassaghi group at MIT are studying diketopiperazine rings in potential anticancer products. They have found that n to pi star interactions in the ring’s disulfide bond greatly reduce its capability of being reduced. When a disulfide bond is reduced, what functional group is produced as a 🔔 result?
gold answer: Thiol
heardbot's guessP(correct)
0 (0%)— 0%
3 (6%)— 0%
6 (12%)— 0%
9 (18%)— 0%
12 (24%)— 0%
15 (31%)— 0%
18 (37%)— 0%
21 (43%)— 0%
24 (49%)— 0%
27 (55%)— 0%
30 (61%)— 0%
33 (67%)— 1%
36 (73%)— 1%
39 (80%)— 1%
42 (86%)Thiols ✓ 63%
45 (92%)Thiol ✓ 70%
48 (98%)Thiol ✓ 83% 🔔
49 (100%)Thiol ✓ 91%
CHEMISTRYAVES-2025 ✓ buzzed CORRECT · buzz @ word 24/25 (100% in)
Identify all of the following three modes of vibration for CO2 that are considered Raman active: 1) Asymmetric stretching; 2) Symmetric stretching; 3) Symmetric bending. 🔔
gold answer: 2 only
heardbot's guessP(correct)
0 (0%)— 0%
3 (12%)— 0%
6 (25%)— 0%
9 (38%)— 0%
12 (50%)— 0%
15 (62%)For CO₂, the Raman active mode is ✗ 56%
18 (75%)1 only ✗ 67%
21 (88%)2 only ✓ 76%
24 (100%)2 only ✓ 88% 🔔
MATHFE!M-2025 ✓ buzzed CORRECT · buzz @ word 31/32 (100% in)
The vertices of a polygon are labeled 𝛢, 𝛣, 𝐶, and so on, in that order. If angle 𝛣𝛢𝐶 is found to be 12 degrees, how many sides does the polygon have? 🔔
gold answer: 15
heardbot's guessP(correct)
0 (0%)— 0%
3 (10%)— 0%
6 (19%)— 0%
9 (29%)— 0%
12 (39%)— 0%
15 (48%)— 0%
18 (58%)— 0%
21 (68%)— 0%
24 (77%)🧮 15 ✓ 38%
27 (87%)🧮 15 ✓ 57%
30 (97%)🧮 15 ✓ 75%
31 (100%)🧮 15 ✓ 85% 🔔
PHYSICSMIT-2025 ✓ buzzed CORRECT · buzz @ word 41/42 (100% in)
A conducting sphere can be considered a capacitor, with the other plate being a concentric conducting shell infinitely far away from the conductor. By what factor does the capacitance of this capacitor change if the sphere’s charge and radius are both doubled? 🔔
gold answer: 2
heardbot's guessP(correct)
0 (0%)— 0%
3 (7%)— 0%
6 (15%)— 0%
9 (22%)— 0%
12 (29%)Infinity ✗ 48%
15 (37%)sphere at infinity ✗ 56%
18 (44%)4πε₀R ✗ 64%
21 (51%)4πε₀R ✗ 80%
24 (59%)— 1%
27 (66%)— 1%
30 (73%)— 1%
33 (80%)— 1%
36 (88%)— 2%
39 (95%)— 2%
41 (100%)2 ✓ 84% 🔔
ENERGYNSBA1 ✓ buzzed CORRECT · buzz @ word 33/34 (100% in)
Scientists at Sandia National Lab are studying the coordination of different crystal structures. Order the following 3 crystal structures in terms of increasing coordination number: 1) Simple cubic; 2) Body-centered cubic; 3) Face-centered cubic. 🔔
gold answer: 1, 2, 3
heardbot's guessP(correct)
0 (0%)— 0%
3 (9%)— 0%
6 (18%)— 0%
9 (27%)— 0%
12 (36%)— 1%
15 (45%)— 1%
18 (55%)— 1%
21 (64%)— 1%
24 (73%)— 1%
27 (82%)Simple cubic ✗ 70%
30 (91%)1, 2, 3 ✓ 79%
33 (100%)1, 2, 3 ✓ 88% 🔔
PHYSICSNSBA2 ✓ buzzed CORRECT · buzz @ word 41/42 (100% in)
David sets up a far-field, single-slit diffraction experiment where the wavelength of light is 600 nanometers. The first minimum in intensity occurs when the path difference between light rays from the top and the bottom of the slit is how many nanometers? 🔔
gold answer: 600
heardbot's guessP(correct)
0 (0%)— 0%
3 (7%)— 0%
6 (15%)— 0%
9 (22%)— 0%
12 (29%)— 0%
15 (37%)— 0%
18 (44%)— 0%
21 (51%)— 0%
24 (59%)300 nanometers ✗ 52%
27 (66%)— 1%
30 (73%)— 1%
33 (80%)🧮 600 ✓ 65%
36 (88%)— 1%
39 (95%)🧮 600 ✓ 70%
41 (100%)🧮 600 ✓ 82% 🔔
MATHSBST ✓ buzzed CORRECT · buzz @ word 28/29 (100% in)
What is the minimum number of cards that must be drawn out of a 52-card deck such that you are guaranteed at least 3 of the same face card? 🔔
gold answer: 47
heardbot's guessP(correct)
0 (0%)— 0%
3 (11%)— 0%
6 (21%)— 0%
9 (32%)— 0%
12 (43%)— 0%
15 (54%)🧮 5 ✗ 40%
18 (64%)🧮 40 ✗ 50%
21 (75%)🧮 14 ✗ 59%
24 (86%)🧮 9 ✗ 68%
27 (96%)🧮 27 ✗ 76%
28 (100%)🧮 47 ✓ 81% 🔔
PHYSICSWalton Rounds ✓ buzzed CORRECT · buzz @ word 17/18 (100% in)
What is the power dissipated in Watts by a 2 Ohm resistor in a circuit with 6 Volts? 🔔
gold answer: 18 (WATTS)
heardbot's guessP(correct)
0 (0%)— 1%
3 (18%)— 1%
6 (35%)— 1%
9 (53%)— 1%
12 (71%)— 2%
15 (88%)— 3%
17 (100%)🧮 18 ✓ 92% 🔔
BIOLOGYdast-2025 ✓ buzzed CORRECT · buzz @ word 18/19 (100% in)
Order the following four root layers from superficial to deep? 1) Pericycle 2) Stele 3) Root cap 4) Cortex 🔔
gold answer: ROOT CAP, CORTEX, PERICYCLE, STELE (3, 4, 1, 2)
heardbot's guessP(correct)
0 (0%)— 1%
3 (17%)— 1%
6 (33%)— 1%
9 (50%)— 1%
12 (67%)— 1%
15 (83%)— 1%
18 (100%)3, 4, 1, 2 ✓ 82% 🔔
EARTH_SPACEBASIS Peoria Rounds ✓ buzzed CORRECT · buzz @ word 8/9 (100% in)
What was the first period in the Paleozoic Era? 🔔
gold answer: CAMBRIAN
heardbot's guessP(correct)
0 (0%)— 1%
3 (38%)— 2%
6 (75%)— 3%
8 (100%)Cambrian ✓ 91% 🔔
ENERGYDasoni Standard1 ✓ buzzed CORRECT · buzz @ word 46/47 (100% in)
Davidson HS A Team members are currently studying freezing fog. Freezing fog is fog formed at temperatures below freezing and can lead to icy roads as the supercooled droplets in the fog freeze on the road surface. What type of precipitation behaves most similarly to freezing fog? 🔔
gold answer: FREEZING RAIN
heardbot's guessP(correct)
0 (0%)— 0%
3 (7%)— 0%
6 (13%)— 0%
9 (20%)— 0%
12 (26%)— 0%
15 (33%)— 0%
18 (39%)— 0%
21 (46%)— 0%
24 (52%)— 0%
27 (59%)— 0%
30 (65%)— 1%
33 (72%)— 1%
36 (78%)— 1%
39 (85%)— 1%
42 (91%)Freezing drizzle ✗ 68%
45 (98%)Freezing rain ✓ 74%
46 (100%)Freezing rain ✓ 85% 🔔
CHEMISTRYGWHS Rounds ✓ buzzed CORRECT · buzz @ word 9/10 (100% in)
What is the molecular geometry around a carbon in ethene? 🔔
gold answer: TRIGONAL PLANAR
heardbot's guessP(correct)
0 (0%)— 1%
3 (33%)— 1%
6 (67%)— 1%
9 (100%)Trigonal planar ✓ 87% 🔔
MATHMHS Rounds ✓ buzzed CORRECT · buzz @ word 8/9 (100% in)
What is the smallest number that has 9 factors? 🔔
gold answer: 36
heardbot's guessP(correct)
0 (0%)— 0%
3 (38%)— 1%
6 (75%)— 1%
8 (100%)🧮 36 ✓ 83% 🔔
ENERGYNSBA1 ✓ buzzed CORRECT · buzz @ word 36/37 (100% in)
Scientists at Oak Ridge National Lab are studying how the 3D arrangement of molecules affects dimerization. Identify all of the following 3 molecules which dimerize to a significant degree at STP: 1) NO2; 2) NH3; 3) BH3. 🔔
gold answer: 1 AND 3
heardbot's guessP(correct)
0 (0%)— 0%
3 (8%)— 0%
6 (17%)— 0%
9 (25%)— 1%
12 (33%)— 1%
15 (42%)— 1%
18 (50%)— 1%
21 (58%)— 1%
24 (67%)— 1%
27 (75%)— 1%
30 (83%)— 1%
33 (92%)1 and 2 ✗ 76%
36 (100%)1 and 3 ✓ 82% 🔔
PHYSICSMIT-2023 ✓ buzzed CORRECT · buzz @ word 47/48 (100% in)
A wheel with radius 0.4 meters rolls without slipping at a speed of 3 meters per second. A point that is 0.2 meters away from the center of the wheel is chosen. In meters per second, as the wheel rolls, what is the maximum speed of the point? 🔔
gold answer: 4.5
heardbot's guessP(correct)
0 (0%)— 0%
3 (6%)— 0%
6 (13%)— 0%
9 (19%)🧮 15/2 ✓ 40%
12 (26%)🧮 5 ✗ 52%
15 (32%)🧮 15/2 ✓ 54%
18 (38%)— 1%
21 (45%)— 1%
24 (51%)— 1%
27 (57%)— 1%
30 (64%)— 1%
33 (70%)— 1%
36 (77%)— 1%
39 (83%)— 1%
42 (89%)— 1%
45 (96%)🧮 9/2 ✓ 80%
47 (100%)🧮 9/2 ✓ 88% 🔔
EARTH_SPACEBASED-2025 ✓ buzzed CORRECT · buzz @ word 18/19 (100% in)
By name or number, order the following three particle types by increasing size: 1. Silt 2. Sand 3. Clay 🔔
gold answer: 3, 1, 2
heardbot's guessP(correct)
0 (0%)— 1%
3 (17%)— 1%
6 (33%)— 1%
9 (50%)— 1%
12 (67%)— 2%
15 (83%)— 2%
18 (100%)3, 1, 2 ✓ 89% 🔔
PHYSICSBASIS Peoria Rounds ✓ buzzed CORRECT · buzz @ word 14/15 (100% in)
Newtons and mass 4 kg. Find the instantaneous acceleration of a rocket with thrust 28 🔔
gold answer: 7
heardbot's guessP(correct)
0 (0%)— 1%
3 (21%)— 1%
6 (43%)— 1%
9 (64%)— 2%
12 (86%)— 2%
14 (100%)🧮 7 ✓ 90% 🔔
PHYSICSCCWTWO ✓ buzzed CORRECT · buzz @ word 18/19 (100% in)
What theorem or law gives the relationship between the rate of change in magnetic flux and the induced current? 🔔
gold answer: Faraday’s Law
heardbot's guessP(correct)
0 (0%)— 1%
3 (17%)— 1%
6 (33%)— 1%
9 (50%)— 1%
12 (67%)— 1%
15 (83%)Faraday's Law ✓ 79%
18 (100%)Faraday's law ✓ 89% 🔔
ENERGYMIT-2025 ✓ buzzed CORRECT · buzz @ word 24/25 (100% in)
Scientists from the Li Lab discovered neutrons occasionally stick to quantum dots instead of scattering as expected. What fundamental interaction is responsible for this phenomenon? 🔔
gold answer: STRONG FORCE / STRONG NUCLEAR FORCE, STRONG
heardbot's guessP(correct)
0 (0%)— 0%
3 (12%)— 1%
6 (25%)— 1%
9 (38%)— 1%
12 (50%)— 1%
15 (62%)— 1%
18 (75%)— 1%
21 (88%)Strong ✓ 79%
24 (100%)strong nuclear force ✓ 86% 🔔
CHEMISTRYNSBA1 ✓ buzzed CORRECT · buzz @ word 11/12 (100% in)
What is the organic product formed when benzaldehyde undergoes a Clemmensen reduction? 🔔
gold answer: TOLUENE / methbenzene
heardbot's guessP(correct)
0 (0%)— 1%
3 (27%)— 1%
6 (55%)— 1%
9 (82%)— 2%
11 (100%)Toluene ✓ 87% 🔔
MATHWalton Rounds ✓ buzzed CORRECT · buzz @ word 20/21 (100% in)
Two fair coins are tossed and at least one is a head. What is the probability that both coins are heads? 🔔
gold answer: 1/3
heardbot's guessP(correct)
0 (0%)— 0%
3 (15%)— 0%
6 (30%)— 0%
9 (45%)— 0%
12 (60%)1/3 ✓ 38%
15 (75%)1/3 ✓ 57%
18 (90%)1/3 ✓ 74%
20 (100%)1/3 ✓ 85% 🔔
MATHBTHS-2025 ✓ buzzed CORRECT · buzz @ word 13/14 (100% in)
What are the solutions to the equation x^2 + 6x - 7 = 0? 🔔
gold answer: -7, 1
heardbot's guessP(correct)
0 (0%)— 0%
3 (23%)— 0%
6 (46%)— 0%
9 (69%)🧮 (Fraction(0, 1), Fraction(-6, 1)) ✗ 64%
12 (92%)x² + 6x - 7 = ✗ 69%
13 (100%)🧮 (-7, 1) ✓ 82% 🔔
PHYSICSCSUB ✓ buzzed CORRECT · buzz @ word 21/22 (100% in)
In a standing wave of a vibrating string, what is the name of the specific harmonic that corresponds to the first overtone? 🔔
gold answer: SECOND HARMONIC
heardbot's guessP(correct)
0 (0%)— 0%
3 (14%)— 1%
6 (29%)— 1%
9 (43%)— 1%
12 (57%)— 1%
15 (71%)— 1%
18 (86%)— 2%
21 (100%)Second harmonic ✓ 86% 🔔
MATHDeadbird Invitational ✓ buzzed CORRECT · buzz @ word 23/24 (100% in)
What is the limit as x approaches infinity of the fraction with numerator e to the x and denominator x factorial? Page 7 TOSS-UP 🔔
gold answer: 0
heardbot's guessP(correct)
0 (0%)— 0%
3 (13%)— 0%
6 (26%)— 0%
9 (39%)— 0%
12 (52%)— 0%
15 (65%)— 0%
18 (78%)infinity ✗ 58%
21 (91%)0 ✓ 68%
23 (100%)🧮 0 ✓ 80% 🔔
CHEMISTRYLexSciBowl ✓ buzzed CORRECT · buzz @ word 37/38 (100% in)
By name or number, identify all of the following 4 types of bonds which are found in boranes, a general class of compounds with chemical formula BxHy: 1) 2-center 2-electrons; 2) 3-center-2-electrons; 3) Sigma 3-center-4-electrons; 4) Pi 3-center-4-electrons. 🔔
gold answer: 1 AND 2
heardbot's guessP(correct)
0 (0%)— 0%
3 (8%)— 0%
6 (16%)— 0%
9 (24%)— 0%
12 (32%)— 0%
15 (41%)— 0%
18 (49%)— 0%
21 (57%)— 0%
24 (65%)— 0%
27 (73%)— 0%
30 (81%)All four ✗ 58%
33 (89%)1, 2, and 3 ✗ 66%
36 (97%)1 and 2 ✓ 73%
37 (100%)1 and 2 ✓ 84% 🔔
BIOLOGYCSUB ✗ buzzed WRONG · buzz @ word 3/11 (30% in)
The 1,25 form of 🔔 Vitamin D is formed in what organ?
gold answer: KIDNEY
heardbot's guessP(correct)
0 (0%)— 1%
3 (30%)Vitamin D ✗ 81% 🔔
6 (60%)calcitriol ✗ 90%
9 (90%)kidney ✓ 95%
10 (100%)Kidney ✓ 98%
EARTH_SPACEDeadbird Invitational ✗ buzzed WRONG · buzz @ word 12/38 (32% in)
Star A has a temperature of 5000 K, while star B has a 🔔 temperature of 15000 K. Given that both stars have the same radius, what is the ratio of the luminosity of star A to star B?
gold answer: 1/81
heardbot's guessP(correct)
0 (0%)— 0%
3 (8%)— 0%
6 (16%)🧮 16 ✗ 55%
9 (24%)🧮 16 ✗ 71%
12 (32%)🧮 16 ✗ 83% 🔔
15 (41%)🧮 81 ✗ 71%
18 (49%)🧮 81 ✗ 83%
21 (57%)🧮 81 ✗ 91%
24 (65%)🧮 1/81 ✓ 83%
27 (73%)🧮 81 ✗ 85%
30 (81%)🧮 1/81 ✓ 86%
33 (89%)🧮 81 ✗ 87%
36 (97%)🧮 1/81 ✓ 88%
37 (100%)🧮 1/81 ✓ 93%
BIOLOGYSBL ✗ buzzed WRONG · buzz @ word 9/21 (45% in)
PYY is a hormone that suppresses the action of what 🔔 hormone released by the walls of the stomach to increase hunger?
gold answer: GHRELIN
heardbot's guessP(correct)
0 (0%)PYY ✗ 57%
3 (15%)peptide YY ✗ 68%
6 (30%)appetite ✗ 77%
9 (45%)NPY ✗ 84% 🔔
12 (60%)Ghrelin ✓ 89%
15 (75%)Ghrelin ✓ 95%
18 (90%)Ghrelin ✓ 98%
20 (100%)Ghrelin ✓ 99%
BIOLOGYMoose ✗ buzzed WRONG · buzz @ word 15/33 (47% in)
What name is given to the region along which transcription factors commonly bind to DNA? This 🔔 region of DNA is distinct from its counterpart in its wider structure thus allowing transcription factor binding.
gold answer: MAJOR GROOVE
heardbot's guessP(correct)
0 (0%)— 0%
3 (9%)— 0%
6 (19%)— 0%
9 (28%)promoter ✗ 51%
12 (38%)promoter ✗ 69%
15 (47%)promoter ✗ 82% 🔔
18 (56%)Promoter ✗ 91%
21 (66%)Promoter ✗ 95%
24 (75%)Promoter ✗ 98%
27 (84%)Major groove ✓ 72%
30 (94%)Major groove ✓ 84%
32 (100%)Major groove ✓ 92%
EARTH_SPACECCWTWO ✗ buzzed WRONG · buzz @ word 6/13 (50% in)
What crystal structure has 3 axes of 🔔 unequal length and unequal intersection angles?
gold answer: TRICLINIC
heardbot's guessP(correct)
0 (0%)— 1%
3 (25%)— 1%
6 (50%)Isometric ✗ 84% 🔔
9 (75%)orthorhombic ✗ 91%
12 (100%)Triclinic ✓ 95%
EARTH_SPACEMoose ✗ buzzed WRONG · buzz @ word 27/55 (50% in)
In reflection nebulae like the Pleiades [PLEE-uh-deez], starlight does not ionize the nebula; instead, compounds scatter their light. Two elements that appear in compounds that scatter light in 🔔 nebulae are iron and nickel. Due to their alignment with the magnetic field of their galaxy, the light from reflection nebulae is slightly affected by what phenomenon?
gold answer: POLARIZATION
heardbot's guessP(correct)
0 (0%)— 0%
3 (6%)— 0%
6 (11%)Blue ✗ 34%
9 (17%)Rayleigh scattering ✗ 44%
12 (22%)Blue ✗ 46%
15 (28%)Blue light ✗ 57%
18 (33%)dust ✗ 67%
21 (39%)Dust ✗ 80%
24 (44%)Carbon and silicon ✗ 77%
27 (50%)Carbon and silicon ✗ 87% 🔔
30 (56%)Silicon ✗ 85%
33 (61%)Dust ✗ 86%
36 (67%)— 4%
39 (72%)Dust grains ✗ 91%
42 (78%)Dust grains ✗ 95%
45 (83%)Polarized ✓ 95%
48 (89%)Polarized ✓ 97%
51 (94%)polarized ✓ 98%
54 (100%)Polarization ✓ 97%
MATHSCB-2025 ✗ buzzed WRONG · buzz @ word 15/30 (52% in)
A piano has 88 keys. Likith and Monish independently and at random choose one of the 🔔 88 keys. What is the probability that Monish’s key is higher than Likhith’s key?
gold answer: 87/176
heardbot's guessP(correct)
0 (0%)— 0%
3 (10%)🧮 9/13 ✗ 25%
6 (21%)🧮 1/88 ✗ 33%
9 (31%)🧮 1/88 ✗ 53%
12 (41%)🧮 1/88 ✗ 72%
15 (52%)🧮 1/88 ✗ 86% 🔔
18 (62%)🧮 1/88 ✗ 93%
21 (72%)🧮 1/88 ✗ 97%
24 (83%)🧮 87/176 ✓ 61%
27 (93%)🧮 87/176 ✓ 78%
29 (100%)🧮 87/176 ✓ 89%
MATHStanford_2025 ✗ buzzed WRONG · buzz @ word 24/47 (52% in)
Leif has 3 red socks, 6 green socks, and 5 black socks in a bag. What is the minimum number of socks that Leif needs 🔔 to randomly draw from the bag to guarantee having 2 socks of one color and another 2 socks of a different color?
gold answer: 9
heardbot's guessP(correct)
0 (0%)— 0%
3 (7%)— 0%
6 (13%)🧮 1/2 ✗ 17%
9 (20%)🧮 4/13 ✗ 22%
12 (26%)🧮 4/13 ✗ 38%
15 (33%)🧮 4 ✗ 31%
18 (39%)🧮 4 ✗ 49%
21 (46%)🧮 4 ✗ 67%
24 (52%)🧮 4 ✗ 82% 🔔
27 (59%)🧮 4 ✗ 91%
30 (65%)🧮 4 ✗ 95%
33 (72%)🧮 4 ✗ 98%
36 (78%)🧮 4 ✗ 99%
39 (85%)🧮 4 ✗ 100%
42 (91%)🧮 9 ✓ 57%
45 (98%)🧮 9 ✓ 74%
46 (100%)— 1%
EARTH_SPACEMIT-2021 ✗ buzzed WRONG · buzz @ word 12/24 (52% in)
Three of the four Galilean moons of Jupiter are locked in a 1:2:4 🔔 orbital resonance. Which Galilean moon is NOT part of this resonance?
gold answer: Callisto
heardbot's guessP(correct)
0 (0%)— 1%
3 (13%)— 1%
6 (26%)— 1%
9 (39%)Laplace resonance ✗ 68%
12 (52%)Laplace resonance ✗ 82% 🔔
15 (65%)Io, Europa, and Ganymede ✗ 81%
18 (78%)Callisto ✓ 88%
21 (91%)Callisto ✓ 94%
23 (100%)Callisto ✓ 97%
BIOLOGYICSBT-2025 ✗ buzzed WRONG · buzz @ word 18/35 (53% in)
Iodide ions are transported into follicular cells through symport with sodium. To attach iodide ions to thyroglobulin for thyroid 🔔 hormone synthesis, iodide ions must then be transported into the colloid by what integral membrane protein?
gold answer: Pendrin
heardbot's guessP(correct)
0 (0%)— 0%
3 (9%)Thyroid gland ✗ 40%
6 (18%)thyroid gland ✗ 58%
9 (26%)Sodium ions ✗ 53%
12 (35%)Thyroid gland ✗ 56%
15 (44%)Thyroid peroxidase ✗ 66%
18 (53%)thyroid peroxidase ✗ 80% 🔔
21 (62%)oxidized ✗ 76%
24 (71%)be oxidized ✗ 83%
27 (79%)the follicular lumen ✗ 88%
30 (88%)pendrin ✓ 91%
33 (97%)Pendrin ✓ 96%
34 (100%)Pendrin ✓ 98%
MATHDAST1 ✗ buzzed WRONG · buzz @ word 27/51 (54% in)
Let a and b be three-dimensional vectors, where (3a + 2b) x (-4a 7b) = ka x b [the quantity three a + two b cross the quantity 🔔 negative four a minus seven b equals k times a cross b], where k is a scalar. What is the value of k?
gold answer: -13
heardbot's guessP(correct)
0 (0%)— 0%
3 (6%)— 0%
6 (12%)— 0%
9 (18%)— 0%
12 (24%)🧮 11 ✗ 18%
15 (30%)🧮 29 ✗ 24%
18 (36%)🧮 29 ✗ 40%
21 (42%)🧮 29 ✗ 57%
24 (48%)🧮 29 ✗ 73%
27 (54%)🧮 29 ✗ 85% 🔔
30 (60%)🧮 29 ✗ 92%
33 (66%)🧮 -13 ✓ 39%
36 (72%)🧮 -13 ✓ 56%
39 (78%)🧮 -13 ✓ 73%
42 (84%)🧮 -13 ✓ 84%
45 (90%)🧮 -13 ✓ 92%
48 (96%)🧮 -13 ✓ 96%
50 (100%)🧮 -13 ✓ 98%
ENERGYCSBL ✗ buzzed WRONG · buzz @ word 18/34 (55% in)
Researchers at Ames National Lab are conducting experiments with CaloriSMART, which could improve the energy efficiency of current refrigeration 🔔 systems. What theoretical heat cycle minimizes heat loss and has the maximum possible theoretical efficiency?
gold answer: CARNOT CYCLE
heardbot's guessP(correct)
0 (0%)— 0%
3 (9%)— 0%
6 (18%)— 0%
9 (27%)— 1%
12 (36%)— 1%
15 (45%)Magnetocaloric effect ✗ 66%
18 (55%)Magnetocaloric effect ✗ 81% 🔔
21 (64%)magnetocaloric effect ✗ 90%
24 (73%)Carnot cycle ✓ 80%
27 (82%)Carnot cycle ✓ 89%
30 (91%)Carnot cycle ✓ 95%
33 (100%)Carnot cycle ✓ 98%
EARTH_SPACEMHS Rounds ✗ buzzed WRONG · buzz @ word 12/23 (55% in)
What is the final nuclide of the CNO cycle, which combines with a 🔔 proton to generate an alpha particle and a carbon-12 nucleus?
gold answer: NITROGEN-15
heardbot's guessP(correct)
0 (0%)— 0%
3 (14%)— 0%
6 (27%)— 1%
9 (41%)Nitrogen-14 ✗ 65%
12 (55%)Nitrogen-14 ✗ 82% 🔔
15 (68%)Nitrogen-14 ✗ 91%
18 (82%)Nitrogen-15 ✓ 81%
21 (95%)Nitrogen-15 ✓ 91%
22 (100%)Nitrogen-15 ✓ 96%
BIOLOGYCast ✗ buzzed WRONG · buzz @ word 9/16 (60% in)
If thirteen fructose molecules were joined together through dehydration reactions, 🔔 what would be the resulting compound?
gold answer: C78H13O65
heardbot's guessP(correct)
0 (0%)— 1%
3 (20%)— 1%
6 (40%)12 water molecules ✗ 74%
9 (60%)12 water molecules ✗ 88% 🔔
12 (80%)12 water molecules ✗ 95%
15 (100%)A polysaccharide made of fructose units ✗ 91%
PHYSICSdast-2025 ✗ buzzed WRONG · buzz @ word 24/41 (60% in)
Two parallel plates of area 0.25 meters squared have a surface charge of 5 couloumbs per square meter. The two plates form a capacitor with 🔔 a capacitance of 4 millifarads. What is the voltage difference between the two plates, in volts?
gold answer: 312.5 V
heardbot's guessP(correct)
0 (0%)— 0%
3 (8%)— 0%
6 (15%)— 0%
9 (22%)🧮 4 ✗ 57%
12 (30%)— 0%
15 (38%)🧮 5.65e+11 ✗ 67%
18 (45%)— 1%
21 (52%)🧮 5.65e+11 ✗ 71%
24 (60%)🧮 5.65e+11 ✗ 83% 🔔
27 (68%)— 1%
30 (75%)🧮 625/2 ✓ 81%
33 (82%)🧮 625/2 ✓ 90%
36 (90%)🧮 625/2 ✓ 95%
39 (98%)🧮 625/2 ✓ 97%
40 (100%)🧮 625/2 ✓ 99%
PHYSICSDasoni Comp1 ✗ buzzed WRONG · buzz @ word 9/16 (60% in)
Diatomic molecules can be modeled as what systems that can 🔔 be analyzed using the Schrodinger equation?
gold answer: QUANTUM HARMONIC OSCILLATOR
heardbot's guessP(correct)
0 (0%)— 1%
3 (20%)— 1%
6 (40%)harmonic oscillators ✗ 79%
9 (60%)Harmonic oscillators ✗ 90% 🔔
12 (80%)Harmonic oscillators ✗ 95%
15 (100%)Quantum harmonic oscillators ✓ 90%
BIOLOGYDAST1 ✗ buzzed WRONG · buzz @ word 15/25 (62% in)
In bacteria, as well as in mitochondria and chloroplasts, the compound that initiates protein synthesis, rather 🔔 than methionine [meth-EYE-o-neen], is methionine attached to what group?
gold answer: FORMYL
heardbot's guessP(correct)
0 (0%)— 0%
3 (12%)— 0%
6 (25%)— 1%
9 (38%)— 1%
12 (50%)N-formylmethionine ✗ 67%
15 (62%)N-formylmethionine ✗ 82% 🔔
18 (75%)N-formylmethionine ✗ 91%
21 (88%)N-formylmethionine ✗ 96%
24 (100%)Formyl ✓ 85%
ENERGYMIT-2023 ✗ buzzed WRONG · buzz @ word 27/44 (63% in)
Researchers in the Francis Bitter Magnet Laboratory at MIT are studying magnetism. Curie’s law is an emperical law that relates the magnetic susceptibility of paramagnetic materials to their 🔔 temperature. According to Curie’s law, the magnetic susceptibility is proportional to temperature raised to what power?
gold answer: −1
heardbot's guessP(correct)
0 (0%)— 0%
3 (7%)— 0%
6 (14%)— 0%
9 (21%)— 0%
12 (28%)Curie temperature ✗ 56%
15 (35%)— 1%
18 (42%)— 1%
21 (49%)susceptibility ✗ 68%
24 (56%)Temperature ✗ 75%
27 (63%)Temperature ✗ 86% 🔔
30 (70%)— 2%
33 (77%)— 2%
36 (84%)inversely proportional to temperature ✗ 85%
39 (91%)inversely proportional ✗ 89%
42 (98%)Negative one ✓ 92%
43 (100%)-1 ✓ 94%
EARTH_SPACENWI-2025 ✗ buzzed WRONG · buzz @ word 12/20 (63% in)
A perched aquifer does not drain down towards the water table because groundwater 🔔 flow is blocked by what low-permeability layer?
gold answer: Aquiclude / Aquitard
heardbot's guessP(correct)
0 (0%)— 0%
3 (16%)— 1%
6 (32%)— 1%
9 (47%)table ✗ 72%
12 (63%)sits on an impermeable layer ✗ 81% 🔔
15 (79%)aquitard ✓ 88%
18 (95%)aquitard ✓ 94%
19 (100%)aquitard ✓ 97%
BIOLOGYDasoni Comp1 ✗ buzzed WRONG · buzz @ word 9/15 (64% in)
Excess neurotransmitter is removed from the synaptic cleft by what 🔔 type of glial [GLEE-ul] cell?
gold answer: ASTROCYTES
heardbot's guessP(correct)
0 (0%)— 1%
3 (21%)— 1%
6 (43%)cleft ✗ 72%
9 (64%)reuptake ✗ 83% 🔔
12 (86%)Astrocytes ✓ 90%
14 (100%)Astrocytes ✓ 95%
PHYSICSPrometheus 2021 ✗ buzzed WRONG · buzz @ word 24/38 (65% in)
A positively charged object is attracted by a rod 1 meter away. If the charges of both objects are doubled, what new distance from the 🔔 rod, in meters, would create a force with half the strength as before?
gold answer: 8
heardbot's guessP(correct)
0 (0%)— 0%
3 (8%)— 0%
6 (16%)— 0%
9 (24%)— 0%
12 (32%)— 0%
15 (41%)— 0%
18 (49%)— 0%
21 (57%)🧮 2 ✗ 67%
24 (65%)🧮 2 ✗ 81% 🔔
27 (73%)🧮 2 ✗ 90%
30 (81%)🧮 2 ✗ 95%
33 (89%)🧮 2.828 ✗ 81%
36 (97%)🧮 2.828 ✗ 90%
37 (100%)🧮 2.828 ✗ 95%
PHYSICSPrometheus 2023 ✗ buzzed WRONG · buzz @ word 27/42 (66% in)
A light beam in air with frequency 6.0 × 1014 Hz goes into glass, which has an index of refraction of 1.5. In scientific notation to two significant 🔔 figures and in hertz, what is the frequency of the light in the glass?
gold answer: 6.0 × 1014
heardbot's guessP(correct)
0 (0%)— 0%
3 (7%)— 0%
6 (15%)— 0%
9 (22%)🧮 5e-07 ✗ 48%
12 (29%)— 0%
15 (37%)🧮 3.333e-07 ✗ 60%
18 (44%)🧮 3.333e-07 ✗ 76%
21 (51%)🧮 333.3 ✗ 70%
24 (59%)🧮 3.333e-07 ✗ 73%
27 (66%)🧮 3.333e-07 ✗ 85% 🔔
30 (73%)🧮 3.333e-07 ✗ 92%
33 (80%)🧮 600000000000000 ✓ 83%
36 (88%)🧮 600000000000000 ✓ 91%
39 (95%)🧮 600000000000000 ✓ 96%
41 (100%)🧮 600000000000000 ✓ 98%
EARTH_SPACEBerkeley-2023 ✗ buzzed WRONG · buzz @ word 15/23 (68% in)
The magnetic field strength of the sun can be measured by the relative splitting of the 🔔 sun’s spectrum. This relies on what effect?
gold answer: ZEEMAN EFFECT
heardbot's guessP(correct)
0 (0%)— 1%
3 (14%)— 1%
6 (27%)— 1%
9 (41%)— 1%
12 (55%)Zeeman effect ✓ 74%
15 (68%)spectral lines ✗ 83% 🔔
18 (82%)Zeeman effect ✓ 85%
21 (95%)Zeeman effect ✓ 92%
22 (100%)Zeeman effect ✓ 96%
ENERGYCast ✗ buzzed WRONG · buzz @ word 15/23 (68% in)
Researchers at Los Alamos National Laboratory are studying protein folding and unfolding. On what level of 🔔 protein folding are zinc fingers found in?
gold answer: SECONDARY STRUCTURE
heardbot's guessP(correct)
0 (0%)— 1%
3 (14%)— 1%
6 (27%)— 1%
9 (41%)— 1%
12 (55%)— 1%
15 (68%)Tertiary ✗ 81% 🔔
18 (82%)— 2%
21 (95%)Tertiary ✗ 85%
22 (100%)Tertiary ✗ 92%
EARTH_SPACESSBT-2023 ✗ buzzed WRONG · buzz @ word 15/23 (68% in)
When temperatures in clouds reach below freezing in certain conditions, water vapor begins to deposit directly 🔔 onto existing ice crystals via what process?
gold answer: BERGERON PROCESS
heardbot's guessP(correct)
0 (0%)— 0%
3 (14%)— 1%
6 (27%)— 1%
9 (41%)— 1%
12 (55%)deposition ✗ 73%
15 (68%)Ice crystals ✗ 81% 🔔
18 (82%)Bergeron process ✓ 87%
21 (95%)Bergeron process ✓ 94%
22 (100%)Bergeron process ✓ 97%
EARTH_SPACEMHS Rounds ✗ buzzed WRONG · buzz @ word 9/14 (69% in)
What is the term for when an inferior planet’s position 🔔 is farthest from Earth?
gold answer: SUPERIOR CONJUNCTION
heardbot's guessP(correct)
0 (0%)— 1%
3 (23%)— 1%
6 (46%)— 2%
9 (69%)conjunction ✗ 87% 🔔
12 (92%)Greatest elongation ✗ 93%
13 (100%)Superior conjunction ✓ 95%
EARTH_SPACEWalton Rounds ✗ buzzed WRONG · buzz @ word 18/27 (69% in)
If the distance between the Earth and the Sun is 150 million km, then what is the distance in 🔔 kilometers between the Earth and its L4 point?
gold answer: 150 MILLION
heardbot's guessP(correct)
0 (0%)— 0%
3 (12%)— 1%
6 (23%)— 1%
9 (35%)— 1%
12 (46%)— 1%
15 (58%)🧮 500 ✗ 77%
18 (69%)🧮 8.333 ✗ 85% 🔔
21 (81%)— 3%
24 (92%)🧮 1.5e+06 ✗ 92%
26 (100%)🧮 150000000 ✓ 95%
MATHPrometheus 2021 ✗ buzzed WRONG · buzz @ word 27/40 (69% in)
Three concentric circles have radii [RAY-dee-eye] of lengths 5, 7, and 10. A region in this shape is shaded if it is contained within an odd number of 🔔 circles. What is the area of the shaded regions of this shape?
gold answer: 76π BONUS xy [the limit as x, y
heardbot's guessP(correct)
0 (0%)— 0%
3 (8%)— 0%
6 (15%)— 0%
9 (23%)🧮 8/27 ✗ 23%
12 (31%)— 0%
15 (38%)🧮 6/25 ✗ 32%
18 (46%)🧮 19/25 ✗ 41%
21 (54%)🧮 76 ✗ 50%
24 (62%)🧮 76 ✗ 68%
27 (69%)🧮 76 ✗ 82% 🔔
30 (77%)🧮 238.8 ✗ 64%
33 (85%)🧮 238.8 ✗ 79%
36 (92%)🧮 238.8 ✗ 88%
39 (100%)🧮 238.8 ✗ 94%
BIOLOGYdast-2025 ✗ buzzed WRONG · buzz @ word 18/27 (69% in)
Which of the two main types of slime molds consists of a large cell with thousands of nuclei within 🔔 a single membrane without walls, forming a syncytium
gold answer: CELLULAR SLIME MOLDS / MYXOGASTRIA
heardbot's guessP(correct)
0 (0%)— 0%
3 (12%)— 0%
6 (23%)— 0%
9 (35%)— 1%
12 (46%)Plasmodial slime molds ✗ 63%
15 (58%)Plasmodial slime molds ✗ 79%
18 (69%)Plasmodial slime molds ✗ 89% 🔔
21 (81%)Plasmodial slime molds ✗ 95%
24 (92%)Plasmodial slime molds ✗ 98%
26 (100%)Plasmodial slime molds ✗ 99%
CHEMISTRYMIT-2024 ✗ buzzed WRONG · buzz @ word 18/27 (69% in)
The cation in Meerwein’s salt, a common methylating agent, is an example of what type of chemical species where 🔔 the oxygen atom carries a positive formal charge?
gold answer: Oxonium / Oxonium cation, Oxonium ion
heardbot's guessP(correct)
0 (0%)— 0%
3 (12%)Trimethyloxonium ✗ 48%
6 (23%)Triethyloxonium ✗ 59%
9 (35%)Trimethyloxonium ✗ 61%
12 (46%)oxocarbenium ion ✗ 71%
15 (58%)Oxocarbenium ion... wait ✗ 79%
18 (69%)Oxocarbenium ion... wait ✗ 89% 🔔
21 (81%)Oxocarbenium ion ✗ 83%
24 (92%)Oxocarbenium ion ✗ 91%
26 (100%)Oxocarbenium ion... actually, Me ✗ 89%
MATHDasoni Standard1 ✗ buzzed WRONG · buzz @ word 33/48 (70% in)
On each of the three days from Monday to Wednesday, the probability of rain is 40%. Given that the occurrence of rain on any two days is independent, what is the probability that there 🔔 is no rain on any of the days? Express your answer as a fraction.
gold answer: 27/125
heardbot's guessP(correct)
0 (0%)— 0%
3 (6%)— 0%
6 (13%)— 0%
9 (19%)— 0%
12 (26%)— 0%
15 (32%)🧮 98/125 ✗ 21%
18 (38%)🧮 4/49 ✗ 27%
21 (45%)— 0%
24 (51%)🧮 44/125 ✗ 36%
27 (57%)🧮 44/125 ✗ 55%
30 (64%)🧮 44/125 ✗ 72%
33 (70%)🧮 44/125 ✗ 85% 🔔
36 (77%)🧮 27/125 ✓ 51%
39 (83%)🧮 27/125 ✓ 69%
42 (89%)🧮 27/125 ✓ 83%
45 (96%)🧮 27/125 ✓ 91%
47 (100%)🧮 27/125 ✓ 96%
CHEMISTRYDasoni Comp1 ✗ buzzed WRONG · buzz @ word 12/18 (71% in)
The most general formulation of the equilibrium constant expresses reactants and products in 🔔 terms of what thermodynamic property?
gold answer: ACTIVITY
heardbot's guessP(correct)
0 (0%)— 0%
3 (18%)— 1%
6 (35%)— 1%
9 (53%)Activities ✓ 70%
12 (71%)activities ✗ 85% 🔔
15 (88%)activities ✗ 93%
17 (100%)Activity ✓ 84%
OTHERBASED-2025 ✗ buzzed WRONG · buzz @ word 15/22 (71% in)
Alex has been overwriting isotope questions. In years, estimate the order of magnitude of the longest 🔔 known half-life of a radioactive isotope.
gold answer: 24
heardbot's guessP(correct)
0 (0%)— 1%
3 (14%)— 1%
6 (29%)— 1%
9 (43%)— 1%
12 (57%)— 1%
15 (71%)10^21 years ✗ 82% 🔔
18 (86%)The longest known half-life belongs to tellurium- ✗ 88%
21 (100%)10^24 ✗ 92%
EARTH_SPACEICSBT-2025 ✗ buzzed WRONG · buzz @ word 18/25 (75% in)
The cooling of white dwarfs and neutron stars is partially thought to take place due to the release of 🔔 neutrinos via what type of process?
gold answer: Urca process
heardbot's guessP(correct)
0 (0%)— 0%
3 (12%)Black dwarf ✗ 52%
6 (25%)— 1%
9 (38%)— 1%
12 (50%)— 1%
15 (62%)neutrino emission ✗ 75%
18 (75%)neutrinos ✗ 82% 🔔
21 (88%)URCA process ✓ 87%
24 (100%)Urca process ✓ 94%
EARTH_SPACESMH-2025 ✗ buzzed WRONG · buzz @ word 18/25 (75% in)
Select all of the following three types of type I supernovae that contain hydrogen spectral lines: 1. Type Ia 🔔 2. Type Ib 3. Type Ic
gold answer: None
heardbot's guessP(correct)
0 (0%)— 0%
3 (12%)— 0%
6 (25%)— 1%
9 (38%)— 1%
12 (50%)— 1%
15 (62%)None ✓ 73%
18 (75%)2 and 3 ✗ 81% 🔔
21 (88%)3 only ✗ 87%
24 (100%)2 and 3 ✗ 89%
ENERGYSBL ✗ buzzed WRONG · buzz @ word 27/37 (75% in)
Scientists at Lawrence Berkeley National Lab have been developing methods for performing artificial photosynthesis. In these methods, titanium dioxide is used for the water-splitting reaction that is traditionally 🔔 catalyzed by what enzyme within photosystem 2 in plants?
gold answer: OXYGEN-EVOLVING COMPLEX / WATER-SPLITTING COMPLEX
heardbot's guessP(correct)
0 (0%)— 0%
3 (8%)— 0%
6 (17%)— 0%
9 (25%)— 0%
12 (33%)photosynthesis ✗ 51%
15 (42%)— 1%
18 (50%)Titanium dioxide ✗ 63%
21 (58%)water splitting ✓ 71%
24 (67%)Hydrogen ✗ 78%
27 (75%)Oxygen ✗ 83% 🔔
30 (83%)Oxygen-evolving complex ✓ 88%
33 (92%)Oxygen-evolving complex ✓ 94%
36 (100%)Oxygen-evolving complex ✓ 97%
BIOLOGYNSBA2 ✗ buzzed WRONG · buzz @ word 18/24 (78% in)
Order the following four components of the light-dependent reactions from first to last. 1) Plastoquinone 2) Photosystem 1 3) 🔔 Photosystem 2 4) Cytochrome b6f
gold answer: 3, 1, 4, 2
heardbot's guessP(correct)
0 (0%)— 0%
3 (13%)— 0%
6 (26%)— 1%
9 (39%)— 1%
12 (52%)— 1%
15 (65%)The light-dependent reactions ✗ 70%
18 (78%)The light-dependent reactions ✗ 83% 🔔
21 (91%)The correct order of the light-dependent reactions ✗ 80%
23 (100%)3, 1, 4, 2 ✓ 86%
ENERGYNWI-2025 ✗ buzzed WRONG · buzz @ word 24/31 (80% in)
In an object oriented programming language, a subclass may inherit from a superclass. What is the term used to describe an object created using the 🔔 subclass but defined with the superclass?
gold answer: POLYMORPHISM
heardbot's guessP(correct)
0 (0%)— 0%
3 (10%)— 0%
6 (20%)— 1%
9 (30%)— 1%
12 (40%)— 1%
15 (50%)— 1%
18 (60%)Inheritance ✗ 71%
21 (70%)— 1%
24 (80%)instance ✗ 81% 🔔
27 (90%)— 2%
30 (100%)Polymorphism ✓ 88%
MATHMIT-2022 ✗ buzzed WRONG · buzz @ word 45/57 (80% in)
By name or number, identify all of the following three measurements that are always sufficient to determine the circumradius of a triangle: 1) The measure of two specific angles and the length of a specific side 2) The measure of one specific angle and the length 🔔 of two specific sides 3) The lengths of any three sides
gold answer: 1, 2, 3 / All
heardbot's guessP(correct)
0 (0%)— 0%
3 (5%)— 0%
6 (11%)— 0%
9 (16%)— 0%
12 (21%)— 0%
15 (27%)— 0%
18 (32%)— 0%
21 (38%)— 0%
24 (43%)— 0%
27 (48%)— 0%
30 (54%)1 and 2 ✗ 18%
33 (59%)1 and 2 ✗ 31%
36 (64%)1 and 2 ✗ 48%
39 (70%)1 and 2 ✗ 65%
42 (75%)1 and 2 ✗ 79%
45 (80%)1 and 2 ✗ 88% 🔔
48 (86%)1 and 2 ✗ 94%
51 (91%)— 0%
54 (96%)1 and 3 ✗ 36%
56 (100%)1 and 3 ✗ 53%
PHYSICSWISC-2021 ✗ buzzed WRONG · buzz @ word 54/68 (81% in)
There are three tuning forks. The first one is tuned at a frequency of 250 Hertz, and second one is tuned at a frequency of 242 Hertz. When the first and third forks are beat, you hear a beat frequency of 15 Hertz. When the second and third forks are beat, you hear a beat 🔔 frequency of 7 Hertz. What is the frequency of the third fork? [SA]
gold answer: 235 HERTZ
heardbot's guessP(correct)
0 (0%)— 0%
3 (4%)— 0%
6 (9%)— 0%
9 (13%)— 0%
12 (18%)— 0%
15 (22%)— 0%
18 (27%)— 0%
21 (31%)— 0%
24 (36%)— 0%
27 (40%)8 Hz ✗ 38%
30 (45%)8 Hz ✗ 56%
33 (49%)— 0%
36 (54%)— 0%
39 (58%)— 0%
42 (63%)— 0%
45 (67%)— 0%
48 (72%)The third fork is either 250+15=265 ✗ 55%
51 (76%)The third fork is either 250+15=265 ✗ 72%
54 (81%)The third fork is either 250+15=265 ✗ 84% 🔔
57 (85%)🧮 235 ✓ 62%
60 (90%)🧮 235 ✓ 78%
63 (94%)🧮 235 ✓ 88%
66 (99%)🧮 235 ✓ 94%
67 (100%)🧮 235 ✓ 97%
CHEMISTRYCSUB ✗ buzzed WRONG · buzz @ word 21/27 (81% in)
First noticed by Faraday in 1857, what is the name for the phenomenon which occurs when light becomes polarized after it is 🔔 passed through a colloidal suspension?
gold answer: THE TYNDAL EFFECT
heardbot's guessP(correct)
0 (0%)— 0%
3 (12%)Faraday effect ✗ 40%
6 (23%)Gold nanoparticles ✗ 53%
9 (35%)— 1%
12 (46%)Faraday effect ✗ 61%
15 (58%)Tyndall effect ✓ 72%
18 (69%)Faraday effect ✗ 75%
21 (81%)Faraday effect ✗ 86% 🔔
24 (92%)Faraday effect ✗ 93%
26 (100%)Tyndall effect ✓ 82%
BIOLOGYMIT-2022 ✗ buzzed WRONG · buzz @ word 27/34 (82% in)
By name or number, identify all of the following four blood components that are present in the buffy coat after blood centrifugation: 1) Plasma 2) White blood cells 🔔 3) Red blood cells 4) Platelets
gold answer: 2 and 4
heardbot's guessP(correct)
0 (0%)— 0%
3 (9%)— 0%
6 (18%)— 0%
9 (27%)— 0%
12 (36%)— 0%
15 (45%)— 0%
18 (55%)The buffy coat contains white blood cells ✗ 57%
21 (64%)The buffy coat contains white blood cells ✗ 74%
24 (73%)2 and 3 ✗ 69%
27 (82%)2 and 3 ✗ 83% 🔔
30 (91%)2 and 4 ✓ 79%
33 (100%)2 and 4 ✓ 89%
EARTH_SPACEPrometheus 2023 ✗ buzzed WRONG · buzz @ word 18/23 (82% in)
Identify all of the following three front types that involve at least one cold air mass: 1) Occluded [uh-CLOO-did]; 🔔 2) Stationary; 3) Warm.
gold answer: All
heardbot's guessP(correct)
0 (0%)— 0%
3 (14%)— 0%
6 (27%)— 1%
9 (41%)— 1%
12 (55%)— 1%
15 (68%)I and II and III ✓ 74%
18 (82%)1 and 3 ✗ 81% 🔔
21 (95%)1 and 3 ✗ 91%
22 (100%)1 and 2 ✗ 88%
CHEMISTRYBASED-2025 ✗ buzzed WRONG · buzz @ word 9/12 (82% in)
Identify the hybridization of the central carbon atom in hydrogen 🔔 cyanide, HCN.
gold answer: SP HYBRIDIZED
heardbot's guessP(correct)
0 (0%)— 0%
3 (27%)— 1%
6 (55%)— 1%
9 (82%)sp³ ✗ 82% 🔔
11 (100%)sp ✓ 88%
CHEMISTRYWSBT ✗ buzzed WRONG · buzz @ word 39/47 (85% in)
Identify all of the following 3 statements which are correct regarding Fischer indole synthesis. 1) Fischer Synthesis can occur when phenylhydrazine is reacted with cyclohexanone 2) Boron Trifluoride can be utilized as a catalyst for this synthesis 3) A single 🔔 indole will be formed in Fischer Synthesis
gold answer: 2 AND 3 Written by APLegends1#3363/Org (Clayden)
heardbot's guessP(correct)
0 (0%)— 0%
3 (7%)— 0%
6 (13%)— 0%
9 (20%)— 0%
12 (26%)— 0%
15 (33%)— 0%
18 (39%)— 0%
21 (46%)— 0%
24 (52%)1 and 2 ✗ 38%
27 (59%)— 0%
30 (65%)1 and 2 ✗ 43%
33 (72%)1 and 2 ✗ 62%
36 (78%)1 and 2 ✗ 77%
39 (85%)1 and 2 ✗ 88% 🔔
42 (91%)1 and 2 ✗ 94%
45 (98%)1 and 2 ✗ 97%
46 (100%)1 and 2 ✗ 98%
PHYSICSRandom Stuff ✗ buzzed WRONG · buzz @ word 18/22 (86% in)
By name or number, rank the following particles by increasing mass: 1) tau neutrino 2) electron neutrino 3) Higgs 🔔 boson 4) muon
gold answer: 2 1 4 3
heardbot's guessP(correct)
0 (0%)— 0%
3 (14%)— 1%
6 (29%)— 1%
9 (43%)— 1%
12 (57%)— 1%
15 (71%)— 1%
18 (86%)2, 1, 3 ✗ 82% 🔔
21 (100%)The ranking by increasing mass: ✗ 88%
BIOLOGYdast-2025 ✗ buzzed WRONG · buzz @ word 30/36 (86% in)
Which of the following four are not true of cancer cells? 1) They are capable of chemotaxis 2) They exhibit anchorage dependence 3) They have undergone a process known as “transformation” 🔔 4) They exhibit density-dependent inhibition
gold answer: 2 AND 4
heardbot's guessP(correct)
0 (0%)— 0%
3 (9%)— 0%
6 (17%)— 0%
9 (26%)— 0%
12 (34%)— 0%
15 (43%)— 0%
18 (51%)— 0%
21 (60%)2 and 4 ✓ 51%
24 (69%)2 and 3 ✗ 63%
27 (77%)2) They exhibit anchorage dependence ✗ 73%
30 (86%)1 and 2 ✗ 82% 🔔
33 (94%)2 ✗ 88%
35 (100%)2 and 4 ✓ 89%
ENERGYBerkeley-2023 ✗ buzzed WRONG · buzz @ word 51/59 (88% in)
Scientists in the Sarpong Lab at UC Berkeley are focused on developing new mechanisms for total synthesis of various natural products. While investigating the kinetics of a substitution reaction where methanol is reacted with 2-bromo-2-methyl pentane, how much is the reaction rate scaled by if the concentration of methanol is doubled while 🔔 the concentration of the alkane is halved?
gold answer: ONE HALF
heardbot's guessP(correct)
0 (0%)— 0%
3 (5%)— 0%
6 (10%)— 0%
9 (16%)— 0%
12 (21%)— 0%
15 (26%)synthesis ✗ 46%
18 (31%)— 0%
21 (36%)— 0%
24 (41%)— 0%
27 (47%)— 0%
30 (52%)— 1%
33 (57%)— 1%
36 (62%)— 1%
39 (67%)— 1%
42 (72%)— 1%
45 (78%)— 1%
48 (83%)🧮 1 ✗ 74%
51 (88%)🧮 1 ✗ 85% 🔔
54 (93%)🧮 1 ✗ 92%
57 (98%)🧮 1 ✗ 96%
58 (100%)🧮 1/2 ✓ 82%
PHYSICSDAST1 ✗ buzzed WRONG · buzz @ word 39/45 (89% in)
What shape is formed when light passes through an object where each infinitesimally thin layer of the object has an index of refraction that varies with the sine of the angle that light approaches it divided by the speed of 🔔 the light at the instant?
gold answer: BRACHISTOCHRONE
heardbot's guessP(correct)
0 (0%)— 0%
3 (7%)— 0%
6 (14%)— 0%
9 (20%)— 0%
12 (27%)— 0%
15 (34%)— 0%
18 (41%)— 0%
21 (48%)— 0%
24 (55%)Mirage ✗ 55%
27 (61%)— 1%
30 (68%)— 1%
33 (75%)Mirage ✗ 63%
36 (82%)Mirage ✗ 78%
39 (89%)Mirage ✗ 89% 🔔
42 (95%)circle ✗ 74%
44 (100%)— 1%
EARTH_SPACEPrometheus 2023 ✗ buzzed WRONG · buzz @ word 24/28 (89% in)
Identify all of the following three phenomena that can significantly alter the spin of a spiral-barred galaxy: 1) Galactic merger; 2) Central supermassive black hole; 🔔 3) Non-uniform halo.
gold answer: 1 only
heardbot's guessP(correct)
0 (0%)— 0%
3 (11%)— 0%
6 (22%)— 0%
9 (33%)— 1%
12 (44%)— 1%
15 (56%)— 1%
18 (67%)— 1%
21 (78%)1 and 2 ✗ 73%
24 (89%)1 and 2 ✗ 86% 🔔
27 (100%)1 and 3 ✗ 83%
ENERGYSBST ✗ buzzed WRONG · buzz @ word 21/24 (91% in)
Argonne National Lab scientists are studying the residual stress evolution of silicon carbide ceramics upon heat treatment. Silicon carbide adopts what 8-atom 🔔 crystal structure?
gold answer: DIAMOND CUBIC
heardbot's guessP(correct)
0 (0%)— 1%
3 (13%)— 1%
6 (26%)— 1%
9 (39%)— 1%
12 (52%)— 1%
15 (65%)— 1%
18 (78%)— 1%
21 (91%)zinc blende structure ✗ 80% 🔔
23 (100%)Zinc blende ✗ 87%
BIOLOGYMoose ✗ buzzed WRONG · buzz @ word 21/24 (91% in)
Identify all of the following three amino acids that contain at least one 5-membered ring: 1) Tryptophan [TRIP-tow-fan]; 2) Histidine [HISS-ti-deen]; 3) 🔔 Proline [PRO-leen]
gold answer: ALL
heardbot's guessP(correct)
0 (0%)— 0%
3 (13%)— 0%
6 (26%)— 0%
9 (39%)— 0%
12 (52%)— 1%
15 (65%)— 1%
18 (78%)1 and 2 ✗ 67%
21 (91%)1 and 2 ✗ 83% 🔔
23 (100%)All three ✓ 78%
PHYSICSNNHS Rounds ✗ buzzed WRONG · buzz @ word 12/14 (92% in)
What type of matter has a density and temperature between plasma and condensed 🔔 matter?
gold answer: WARM DENSE MATTER / WDM
heardbot's guessP(correct)
0 (0%)— 1%
3 (23%)— 1%
6 (46%)— 1%
9 (69%)— 2%
12 (92%)Degenerate matter ✗ 86% 🔔
13 (100%)Degenerate matter ✗ 92%
MATHMIT-2021 ✗ buzzed WRONG · buzz @ word 24/27 (92% in)
A rhombus has a side length of 20, and contains an angle measuring 60 degrees. What is the length of the longest diagonal of the 🔔 rhombus? √
gold answer: 20 3
heardbot's guessP(correct)
0 (0%)— 0%
3 (12%)— 0%
6 (23%)— 0%
9 (35%)🧮 320 ✗ 26%
12 (46%)🧮 346.4 ✗ 35%
15 (58%)🧮 346.4 ✗ 55%
18 (69%)🧮 34.64 ✗ 50%
21 (81%)🧮 34.64 ✗ 69%
24 (92%)🧮 34.64 ✗ 84% 🔔
26 (100%)🧮 34.64 ✗ 92%
MATHCSBL ✗ buzzed WRONG · buzz @ word 12/14 (92% in)
Let f(x) = 2x3 + 3. What is the degree of the polynomial 🔔 f(x)3?
gold answer: 9
heardbot's guessP(correct)
0 (0%)— 0%
3 (23%)— 0%
6 (46%)🧮 2 ✗ 59%
9 (69%)🧮 3 ✗ 71%
12 (92%)🧮 3 ✗ 86% 🔔
13 (100%)🧮 9 ✓ 82%
ENERGYCCWTWO ✗ buzzed WRONG · buzz @ word 15/17 (94% in)
By name or number, order the following coal types in increasing carbon content: Bituminous, lignite, peat, 🔔 anthracite
gold answer: Peat, lignite, bituminous, anthracite
heardbot's guessP(correct)
0 (0%)— 1%
3 (19%)— 1%
6 (38%)— 2%
9 (56%)— 2%
12 (75%)— 3%
15 (94%)Peat, lignite, bituminous, anth ✗ 91% 🔔
16 (100%)Peat, lignite, bituminous, anth ✗ 96%
CHEMISTRYWalton Rounds ✗ buzzed WRONG · buzz @ word 21/23 (95% in)
Identify all of the following that would burn green when subjected to a flame test: 1) Lithium, 2) Barium, 3) Calcium, 4) 🔔 Boron
gold answer: 2 AND 4 / BARIUM AND BORON
heardbot's guessP(correct)
0 (0%)— 0%
3 (14%)— 0%
6 (27%)— 0%
9 (41%)— 1%
12 (55%)— 1%
15 (68%)— 1%
18 (82%)2 only ✗ 74%
21 (95%)2 only ✗ 87% 🔔
22 (100%)2 and 4 ✓ 83%
EARTH_SPACESBL ✗ buzzed WRONG · buzz @ word 24/26 (96% in)
Identify all of the following three solar system bodies that are known to have permanent polar ice caps: 1) Mars; 2) The Earth’s moon; 3) 🔔 Venus.
gold answer: 1 ONLY
heardbot's guessP(correct)
0 (0%)— 0%
3 (12%)— 0%
6 (24%)— 1%
9 (36%)— 1%
12 (48%)— 1%
15 (60%)— 1%
18 (72%)— 1%
21 (84%)1 and 2 ✗ 79%
24 (96%)1 and 2 ✗ 90% 🔔
25 (100%)1 and 2 ✗ 95%
MATHMIT-2023 ✗ buzzed WRONG · buzz @ word 30/32 (97% in)
What is the maximum value over real values of x for the expression esin (x)+cos (x) (read: e raised to the power of the quantity sine x plus cosine x )? 🔔 √
gold answer: e 2
heardbot's guessP(correct)
0 (0%)— 0%
3 (10%)— 0%
6 (19%)— 0%
9 (29%)— 0%
12 (39%)— 0%
15 (48%)I need to maximize e^(sin(x) + ✗ 39%
18 (58%)I need to maximize e^(sin(x) + ✗ 59%
21 (68%)I need to maximize sin(x) + cos(x ✗ 51%
24 (77%)I need to maximize sin(x) + cos(x ✗ 71%
27 (87%)The maximum of sin(x) + cos(x) ✗ 64%
30 (97%)The maximum of sin(x) + cos(x) ✗ 80% 🔔
31 (100%)The maximum of sin(x) + cos(x) ✗ 89%
EARTH_SPACELexSciBowl ✗ buzzed WRONG · buzz @ word 28/29 (100% in)
By name or number, order the following four astronomical bodies in increasing order of energy per photon emitted: 1) crab pulsar, 2) quasar 3C 273, 3) Betelgeuse, 4) Rigel. 🔔
gold answer: 2, 3, 4, 1
heardbot's guessP(correct)
0 (0%)— 0%
3 (11%)— 0%
6 (21%)— 0%
9 (32%)— 1%
12 (43%)— 1%
15 (54%)— 1%
18 (64%)— 1%
21 (75%)— 1%
24 (86%)— 1%
27 (96%)— 2%
28 (100%)3, 1, 4, 2 ✗ 81% 🔔
MATHCSUB ✗ buzzed WRONG · buzz @ word 21/22 (100% in)
Of the following 5 angles, which pair of angles are coterminal with one another: 50°; -50°; 50° + 2(360°); 11/3 rev; 0° 🔔
gold answer: 50° AND 50° + 2(360°) BONUS 2
heardbot's guessP(correct)
0 (0%)— 0%
3 (14%)— 0%
6 (29%)— 0%
9 (43%)— 0%
12 (57%)— 0%
15 (71%)— 1%
18 (86%)🧮 50° and 50° + 2(360°) ✓ 60%
21 (100%)50° and 50° + 2(360 ✗ 80% 🔔
CHEMISTRYNNHS Rounds ✗ buzzed WRONG · buzz @ word 22/23 (100% in)
Identify all of the following three compounds that have the same empirical formula as formic acid: 1) Acetic acid; 2) Glucose; 3) 1-propanol. 🔔
gold answer: NONE
heardbot's guessP(correct)
0 (0%)— 0%
3 (14%)— 0%
6 (27%)— 0%
9 (41%)— 0%
12 (55%)— 0%
15 (68%)Formic acid is HCOOH, empirical ✗ 61%
18 (82%)Formic acid is HCOOH, empirical ✗ 78%
21 (95%)🧮 1 and 2 ✗ 74%
22 (100%)Formic acid: HCOOH → CH ✗ 81% 🔔
CHEMISTRYSSBT-2023 ✗ buzzed WRONG · buzz @ word 15/16 (100% in)
Rank the following three ions in increasing ionic radii: 1) F-; 2) Na +; 3) Mg2+. 🔔
gold answer: 3 2 1 VISUAL
heardbot's guessP(correct)
0 (0%)— 0%
3 (20%)— 0%
6 (40%)— 1%
9 (60%)— 1%
12 (80%)The three ions are F⁻, Na ✗ 74%
15 (100%)2, 3, 1 ✗ 83% 🔔
EARTH_SPACErandom ✗ buzzed WRONG · buzz @ word 9/10 (100% in)
What ion is the primary weak base in ocean water? 🔔
gold answer: BICARBONATE / HYDROGEN CARBONATE, HCO3 -
heardbot's guessP(correct)
0 (0%)— 2%
3 (33%)— 2%
6 (67%)— 4%
9 (100%)Carbonate ion ✗ 93% 🔔
PHYSICSWISC-2021 ✗ buzzed WRONG · buzz @ word 37/38 (100% in)
Identify all of the following three statements which are true about Compton scattering: 1) It is inelastic; 2) The wavelength shift decreases as the scattering angle increases; 3) The scattering is usually caused by a charged particle. [SA] 🔔
gold answer: 1 AND 3
heardbot's guessP(correct)
0 (0%)— 0%
3 (8%)— 0%
6 (16%)— 0%
9 (24%)— 0%
12 (32%)— 0%
15 (41%)— 0%
18 (49%)— 0%
21 (57%)— 0%
24 (65%)— 1%
27 (73%)1 only ✗ 57%
30 (81%)1 only ✗ 72%
33 (89%)1 and 3 ✓ 70%
36 (97%)Let me analyze each statement: ✗ 79%
37 (100%)Let me analyze each statement: ✗ 88% 🔔
MATHtexas_sci_bowl_2025 ✗ buzzed WRONG · buzz @ word 9/10 (100% in)
What is the tangent of the arccosine of 3/7? √ 🔔
gold answer: 2 310
heardbot's guessP(correct)
0 (0%)— 0%
3 (33%)— 1%
6 (67%)— 1%
9 (100%)If arccos(3/7) = θ, ✗ 84% 🔔
MATHGWHS Rounds ✗ buzzed WRONG · buzz @ word 9/10 (100% in)
What is the absolute value of 13 − 13 𝑖? 🔔
gold answer: 1
heardbot's guessP(correct)
0 (0%)— 0%
3 (33%)— 0%
6 (67%)🧮 13 ✗ 71%
9 (100%)🧮 18.38 ✗ 84% 🔔
EARTH_SPACEICSBT-2025 ✗ buzzed WRONG · buzz @ word 18/19 (100% in)
Order the following three igneous rocks in terms of increasing speed of crystallization: 1) Dacite; 2) Diabase; 3) Tachylite. 🔔
gold answer: 2, 1, 3
heardbot's guessP(correct)
0 (0%)— 1%
3 (17%)— 1%
6 (33%)— 1%
9 (50%)— 1%
12 (67%)— 2%
15 (83%)— 2%
18 (100%)The three rocks: ✗ 89% 🔔
MATHNWI-2025 ✗ buzzed WRONG · buzz @ word 7/8 (100% in)
What is the value of 115 mod 7? 🔔
gold answer: 4
heardbot's guessP(correct)
0 (0%)— 0%
3 (43%)— 1%
6 (86%)— 1%
7 (100%)🧮 3 ✗ 85% 🔔
MATHTHUMB-2025 ✗ buzzed WRONG · buzz @ word 9/10 (100% in)
What is the 10th derivative of the cosine of 2x? 🔔
gold answer: -1024cos(2x)
heardbot's guessP(correct)
0 (0%)— 0%
3 (33%)🧮 55 ✗ 61%
6 (67%)— 1%
9 (100%)🧮 -1024 ✗ 84% 🔔
MATHBTHS-2025 — abstained (never confident) · no buzz
What is the determinant of the 2x2 matrix with first row [5, 3] and second row [2, 8]?
gold answer: 34
heardbot's guessP(correct)
0 (0%)— 0%
3 (18%)— 0%
6 (35%)— 0%
9 (53%)— 0%
12 (71%)— 0%
15 (88%)🧮 -2 ✗ 62%
17 (100%)🧮 34 ✓ 71%
MATHCast — abstained (never confident) · no buzz
What is the area of an equilateral triangle with side length 2?
gold answer: √3
heardbot's guessP(correct)
0 (0%)— 0%
3 (27%)— 1%
6 (55%)— 1%
9 (82%)— 1%
11 (100%)🧮 1.732 ✓ 79%
MATHDasoni Standard1 — abstained (never confident) · no buzz
What is sixty four raised to the power of quantity log base twenty seven of nine end quantity?
gold answer: 16
heardbot's guessP(correct)
0 (0%)— 0%
3 (18%)— 0%
6 (35%)— 0%
9 (53%)— 0%
12 (71%)— 1%
15 (88%)I need to find 64^(log₂ ✗ 69%
17 (100%)I need to compute 64^(log₂ ✗ 77%
PHYSICSDasoni Comp1 — abstained (never confident) · no buzz
A machine stores energy by producing a magnetic field inside a spherical glitter bead. If the radius of the glitter bead is quadrupled and the strength of the magnetic field is halved, how many times more energy can this new machine store?
gold answer: 16
heardbot's guessP(correct)
0 (0%)— 0%
3 (7%)— 0%
6 (15%)— 0%
9 (22%)inductor ✗ 48%
12 (29%)— 0%
15 (37%)— 0%
18 (44%)— 1%
21 (51%)— 1%
24 (59%)— 1%
27 (66%)— 1%
30 (73%)— 1%
33 (80%)— 1%
36 (88%)— 1%
39 (95%)— 1%
41 (100%)— 1%
MATHICSBT-2025 — abstained (never confident) · no buzz
Dole and Chiquita are playing a game with Dole going first. Each turn, one of them rolls two six-sided dice. Whoever rolls two prime numbers first wins. What is the probability that the winner is Chiquita?
gold answer: 3/7
heardbot's guessP(correct)
0 (0%)— 0%
3 (9%)— 0%
6 (17%)— 0%
9 (26%)— 0%
12 (34%)— 0%
15 (43%)— 0%
18 (51%)— 0%
21 (60%)— 0%
24 (69%)— 0%
27 (77%)— 0%
30 (86%)— 0%
33 (94%)— 0%
35 (100%)— 0%
PHYSICSMIT-2021 — abstained (never confident) · no buzz
What is the Young’s Modulus of a rod of length 3 meters if it shrinks by 1.5 centimeters lengthwise under a pressure of 30 pascals?
gold answer: 60,000 pascals
heardbot's guessP(correct)
0 (0%)— 0%
3 (12%)— 0%
6 (25%)— 0%
9 (38%)— 1%
12 (50%)— 1%
15 (62%)— 1%
18 (75%)— 1%
21 (88%)— 1%
24 (100%)🧮 6000 ✗ 80%
MATHMIT-2024 — abstained (never confident) · no buzz
What is the sum of the cubes of −1 through 9, inclusive?
gold answer: 2024
heardbot's guessP(correct)
0 (0%)— 0%
3 (27%)— 0%
6 (55%)— 0%
9 (82%)— 1%
11 (100%)🧮 2024 ✓ 77%
MATHNNHS Rounds — abstained (never confident) · no buzz
If rotations and reflections are considered equivalent, then how many ways are there to pick two of the six faces of a white cube and paint them blue?
gold answer: 2
heardbot's guessP(correct)
0 (0%)— 0%
3 (11%)— 0%
6 (22%)— 0%
9 (33%)— 0%
12 (44%)— 0%
15 (56%)— 0%
18 (67%)— 0%
21 (78%)— 0%
24 (89%)— 0%
27 (100%)— 0%
MATHSCB-2025 — abstained (never confident) · no buzz
In a certain probability distribution, the value 20 has a z-score of 1.2, and the value 11 has a z-score of -.6. What is the standard deviation of this distribution?
gold answer: 5
heardbot's guessP(correct)
0 (0%)— 0%
3 (10%)— 0%
6 (21%)— 0%
9 (31%)— 0%
12 (41%)— 0%
15 (52%)— 0%
18 (62%)— 0%
21 (72%)🧮 (Fraction(14, 1), Fraction(5, 1)) ✗ 40%
24 (83%)🧮 14 ✗ 50%
27 (93%)🧮 5 ✓ 60%
29 (100%)🧮 5 ✓ 76%
PHYSICSStanford_2025 — abstained (never confident) · no buzz
To the nearest second and neglecting air resistance, how long will it take for a ball to hit the ground if it is dropped from a tower of height 20 meters?
gold answer: 2
heardbot's guessP(correct)
0 (0%)— 0%
3 (10%)— 0%
6 (20%)— 0%
9 (30%)— 0%
12 (40%)— 0%
15 (50%)— 1%
18 (60%)— 1%
21 (70%)— 1%
24 (80%)— 1%
27 (90%)— 1%
30 (100%)🧮 2 ✓ 78%
MATHSMH-2025 — abstained (never confident) · no buzz
A ball is dropped from a height of 4 meters. On each bounce, it bounces up to 1/3 of the previous height it bounced up to. How many times has it bounced when the ball first fails to bounce to a height of 0.1 meters?
gold answer: 4
heardbot's guessP(correct)
0 (0%)— 0%
3 (7%)— 0%
6 (14%)— 0%
9 (20%)— 0%
12 (27%)— 0%
15 (34%)🧮 20 ✗ 23%
18 (41%)🧮 8 ✗ 30%
21 (48%)🧮 8 ✗ 47%
24 (55%)🧮 8 ✗ 64%
27 (61%)— 0%
30 (68%)— 0%
33 (75%)— 0%
36 (82%)— 0%
39 (89%)🧮 2 ✗ 49%
42 (95%)🧮 2 ✗ 66%
44 (100%)🧮 4 ✓ 59%
MATHdast-2025 — abstained (never confident) · no buzz
What is the measure of the larger angle, in degrees, between the minute hand and the hour hand of a 12-hour clock at 3:58?
gold answer: 229
heardbot's guessP(correct)
0 (0%)— 0%
3 (13%)— 0%
6 (26%)— 0%
9 (39%)— 0%
12 (52%)— 0%
15 (65%)— 0%
18 (78%)— 0%
21 (91%)— 0%
23 (100%)🧮 1309 ✗ 58%
BIOLOGYBASED-2025 — abstained (never confident) · no buzz
Ethan is having a heated debate with a classmate about whether or not a potato is alive. By name or number, select all of the following four traits that are shared by all living organisms: 1. Ability to respond to stimuli 2. Ability to move 3. Ability to maintain homeostasis 4. Ability to reproduce
gold answer: 1, 3, AND 4
heardbot's guessP(correct)
0 (0%)— 0%
3 (6%)— 0%
6 (11%)— 0%
9 (17%)— 0%
12 (23%)— 0%
15 (28%)— 0%
18 (34%)— 0%
21 (40%)— 0%
24 (45%)— 0%
27 (51%)— 0%
30 (57%)— 0%
33 (62%)— 0%
36 (68%)— 0%
39 (74%)— 0%
42 (79%)— 0%
45 (85%)1 and 3 and 4 ✓ 47%
48 (91%)1, 3 ✗ 55%
51 (96%)1 and 3 ✗ 62%
53 (100%)1, 3, 4 ✓ 69%
MATHDasoni Comp1 — abstained (never confident) · no buzz
A sphenocorona (sfee-noh-cor-oh-nuh) is a polyhedron with 22 edges and 14 faces. How many vertices does it have?
gold answer: 10
heardbot's guessP(correct)
0 (0%)— 0%
3 (18%)— 0%
6 (35%)— 0%
9 (53%)🧮 14 ✗ 46%
12 (71%)🧮 10 ✓ 59%
15 (88%)🧮 10 ✓ 79%
17 (100%)🧮 -6 ✗ 75%
CHEMISTRYMHS Rounds — abstained (never confident) · no buzz
Order the following 3 pericyclic reactions from least to greatest in the total change of the number of sigma bonds: 1) Sigmatropic; 2) Cycloaddition; 3) Electrocyclic.
gold answer: 1, 3, 2
heardbot's guessP(correct)
0 (0%)— 0%
3 (12%)— 0%
6 (24%)— 0%
9 (36%)— 0%
12 (48%)— 0%
15 (60%)— 1%
18 (72%)— 1%
21 (84%)— 1%
24 (96%)1, 3, 2 ✓ 71%
25 (100%)In pericyclic reactions: ✗ 77%
MATHMIT-2025 — abstained (never confident) · no buzz
Five students take an exam and all receive positive integer scores. Given that the unique mode of their scores is 5, what is the smallest possible mean of their scores?
gold answer: 16/5 / 3.2
heardbot's guessP(correct)
0 (0%)— 0%
3 (10%)— 0%
6 (21%)— 0%
9 (31%)— 0%
12 (41%)— 0%
15 (52%)— 0%
18 (62%)— 0%
21 (72%)— 0%
24 (83%)— 0%
27 (93%)🧮 16/5 ✗ 46%
29 (100%)— 0%
MATHMoose — abstained (never confident) · no buzz
Right triangle ABC has legs of length 12 and 16. If a line is drawn from vertex B that intersects AC at P, how many different integer values can the length of BP be?
gold answer: 7
heardbot's guessP(correct)
0 (0%)— 0%
3 (9%)— 0%
6 (18%)— 0%
9 (27%)20 ✗ 18%
12 (36%)— 0%
15 (45%)🧮 48/5 ✗ 36%
18 (55%)🧮 10 ✗ 48%
21 (64%)🧮 48/5 ✗ 51%
24 (73%)— 0%
27 (82%)17 ✗ 57%
30 (91%)— 1%
33 (100%)— 1%
CHEMISTRYNSBA1 — abstained (never confident) · no buzz
Rank the following 3 salts in order of increasing solubility in water: 1) Lead chloride; 2) Calcium fluoride; 3) Barium acetate.
gold answer: 2, 1, 3
heardbot's guessP(correct)
0 (0%)— 0%
3 (15%)— 0%
6 (30%)— 1%
9 (45%)— 1%
12 (60%)— 1%
15 (75%)— 1%
18 (90%)— 1%
20 (100%)I need to rank PbCl₂, C ✗ 76%
EARTH_SPACERandom Stuff — abstained (never confident) · no buzz
By name or number, list all of the following species which are used by astronomers to map the distribution of gas in the interstellar medium due to their significant radio emission: 1) H2 2) H2O 3) He 4) CO
gold answer: 1, 4
heardbot's guessP(correct)
0 (0%)— 0%
3 (8%)— 0%
6 (16%)— 0%
9 (24%)— 0%
12 (32%)— 0%
15 (39%)— 0%
18 (47%)— 0%
21 (55%)— 0%
24 (63%)— 1%
27 (71%)— 1%
30 (79%)— 1%
33 (87%)— 1%
36 (95%)2 and 3 ✗ 70%
38 (100%)2 and 4 ✗ 76%
CHEMISTRYWISC-2021 — abstained (never confident) · no buzz
Order the following three 0.1 molar solutions from lowest to highest pH: 1) Calcium cyanide; 2) Barium iodide; 3) Aluminum chloride. [JI]
gold answer: 3, 2, 1 (ALUMINUM CHLORIDE, BARIUM IODIDE, CALCIUM CYANIDE)
heardbot's guessP(correct)
0 (0%)— 0%
3 (14%)— 0%
6 (29%)— 0%
9 (43%)— 0%
12 (57%)— 1%
15 (71%)— 1%
18 (86%)— 1%
21 (100%)🧮 3, 2, 1 ✓ 72%
CHEMISTRYBerkeley-2023 — abstained (never confident) · no buzz
What is the name of the chemical moiety that distinguishes the nitrogenous bases uracil and thymine?
gold answer: METHYL GROUP
heardbot's guessP(correct)
0 (0%)— 0%
3 (20%)— 0%
6 (40%)— 1%
9 (60%)— 1%
12 (80%)— 1%
15 (100%)Methyl group ✓ 80%
MATHCSUB — abstained (never confident) · no buzz
Calculate the following indefinite integral: I = ∫ xe2x dx
gold answer: 1 2 x2 e + C / + Constant 4 Page 10
heardbot's guessP(correct)
0 (0%)— 0%
3 (33%)— 0%
6 (67%)— 1%
9 (100%)🧮 x*e^(2x)/2 - e^(2x)/4 + C ✓ 79%
CHEMISTRYLexSciBowl — abstained (never confident) · no buzz
By name or number, order the following three measures of speed for a sample of gas particles from least to greatest: 1) Average; 2) Root mean square; 3) Most common.
gold answer: 3, 1, 2
heardbot's guessP(correct)
0 (0%)— 0%
3 (10%)— 0%
6 (21%)— 0%
9 (31%)— 0%
12 (41%)— 0%
15 (52%)— 0%
18 (62%)— 0%
21 (72%)— 0%
24 (83%)1, 3, 2 ✗ 59%
27 (93%)1, 3, 2 ✗ 77%
29 (100%)3, 1, 2 ✓ 70%
ENERGYNNHS Rounds — abstained (never confident) · no buzz
Researchers at Lawrence Livermore National Lab are studying the production of acetaldehyde and hydrogen from ethanol using a silver catalyst at high temperatures. Identify all of the following three changes that would cause the equilibrium to shift towards the products: 1) Increasing pressure; 2) Adding more hydrogen; 3) Adding helium.
gold answer: NONE
heardbot's guessP(correct)
0 (0%)— 0%
3 (6%)— 0%
6 (12%)— 0%
9 (18%)— 0%
12 (24%)— 0%
15 (31%)— 0%
18 (37%)catalyst ✗ 50%
21 (43%)temperature ✗ 58%
24 (49%)— 1%
27 (55%)— 1%
30 (61%)— 1%
33 (67%)— 1%
36 (73%)— 1%
39 (80%)— 1%
42 (86%)— 1%
45 (92%)— 1%
48 (98%)I need to determine the reaction first ✗ 80%
49 (100%)— 2%
CHEMISTRYSBST — abstained (never confident) · no buzz
Identify all of the following three molecules that have the same central carbon oxidation state as methanol: 1) Formic acid; 2) Formaldehyde; 3) Propene.
gold answer: NONE
heardbot's guessP(correct)
0 (0%)— 0%
3 (13%)— 0%
6 (26%)— 0%
9 (39%)— 0%
12 (52%)— 1%
15 (65%)— 1%
18 (78%)— 1%
21 (91%)— 1%
23 (100%)Let me calculate oxidation states: ✗ 73%
MATHrandom — abstained (never confident) · no buzz
With respect to the axis of symmetry of the graph of y = x2 + 12x + 25, what are the coordinates of the point that is symmetric to the point (–10, 5)?
gold answer: (–2, 5)
heardbot's guessP(correct)
0 (0%)— 0%
3 (9%)— 0%
6 (19%)— 0%
9 (28%)— 0%
12 (38%)— 0%
15 (47%)🧮 -6 ✗ 28%
18 (56%)🧮 -6 ✗ 45%
21 (66%)🧮 (-6, -11) ✗ 40%
24 (75%)🧮 (Fraction(-6, 1), Fraction(-11, 1)) ✗ 50%
27 (84%)🧮 (Fraction(-12, 1), Fraction(25, 1)) ✗ 60%
30 (94%)🧮 (Fraction(-12, 1), Fraction(25, 1)) ✗ 76%
32 (100%)🧮 (-2, 5) ✓ 71%
BIOLOGYAVES-2025 — abstained (never confident) · no buzz
If a certain species of grasshopper and bee have the same number of distinct autosomal chromosomes, order the following four organisms by increasing chromosome count: 1) Male bee 2) Male grasshopper 3) Female bee 4) Female grasshopper
gold answer: 1, 3, 2, 4
heardbot's guessP(correct)
0 (0%)— 0%
3 (8%)— 0%
6 (17%)— 0%
9 (25%)— 0%
12 (33%)— 0%
15 (42%)— 0%
18 (50%)— 0%
21 (58%)— 1%
24 (67%)— 1%
27 (75%)— 1%
30 (83%)— 1%
33 (92%)— 1%
36 (100%)— 1%
ENERGYLexSciBowl — abstained (never confident) · no buzz
Researchers at Idaho National Labs are studying how to implement solar energy in the US. By name or number, order the following 4 layers from furthest to exposed sunlight to closest to exposed sunlight in a solar panel: 1) Silicon layer; 2) N type semiconductor; 3) P type.semiconductor.
gold answer: 3, 1, 2
heardbot's guessP(correct)
0 (0%)— 0%
3 (6%)— 0%
6 (13%)— 0%
9 (19%)— 0%
12 (26%)— 0%
15 (32%)— 0%
18 (38%)— 0%
21 (45%)— 0%
24 (51%)— 1%
27 (57%)— 1%
30 (64%)— 1%
33 (70%)— 1%
36 (77%)— 1%
39 (83%)— 1%
42 (89%)— 1%
45 (96%)— 1%
47 (100%)— 1%
ENERGYMEHS Rounds — abstained (never confident) · no buzz
Researchers at Argonne National Lab have been conducting research into superfluids by exploring computer simulations of the Bose-Einstein condensate. Identify all of the following particles can’t be in matter that is considered to be a Bose-Einstein condensate: 1) Proton; 2) Electron; 3) Pion; 4) Neutron.
gold answer: 3 ONLY
heardbot's guessP(correct)
0 (0%)— 0%
3 (7%)— 0%
6 (14%)— 0%
9 (20%)— 0%
12 (27%)— 0%
15 (34%)— 0%
18 (41%)— 0%
21 (48%)— 1%
24 (55%)— 1%
27 (61%)— 1%
30 (68%)— 1%
33 (75%)— 1%
36 (82%)— 1%
39 (89%)— 1%
42 (95%)— 1%
44 (100%)Bose-Einstein condensates consist of bosons ✗ 77%
CHEMISTRYMIT-2020 — abstained (never confident) · no buzz
By name or number, arrange the following three radicals in increasing stability: 1) Vinyl radical 2) Allyl radical 3) Tertbutyl radical
gold answer: 1, 3, 2
heardbot's guessP(correct)
0 (0%)— 0%
3 (15%)— 0%
6 (30%)— 0%
9 (45%)— 1%
12 (60%)— 1%
15 (75%)— 1%
18 (90%)— 1%
20 (100%)1, 2, 3 ✗ 75%
CHEMISTRYMIT-2023 — abstained (never confident) · no buzz
Rank the following three molecules in terms of increasing entropy of vaporization at 25 degrees Celsius: 1) Water 2) Methanol 3) Methane
gold answer: 3, 2, 1
heardbot's guessP(correct)
0 (0%)— 0%
3 (14%)— 0%
6 (29%)— 0%
9 (43%)— 0%
12 (57%)— 1%
15 (71%)— 1%
18 (86%)— 1%
21 (100%)— 1%
MATHNSI_2024 — abstained (never confident) · no buzz
A right triangle is formed when a ladder is leaned against a wall forming an angle, 𝜃. Given that the base of the ladder is 6 meters from the wall and the length of the ladder is 10 meters, calculate 𝑐𝑜𝑡(θ).
gold answer: 3/4
heardbot's guessP(correct)
0 (0%)— 0%
3 (8%)— 0%
6 (15%)— 0%
9 (22%)— 0%
12 (30%)— 0%
15 (38%)— 0%
18 (45%)— 0%
21 (52%)— 0%
24 (60%)— 0%
27 (68%)— 0%
30 (75%)— 0%
33 (82%)— 0%
36 (90%)— 0%
39 (98%)🧮 8 ✗ 38%
40 (100%)🧮 3/4 ✓ 44%
ENERGYStanford_2025 — abstained (never confident) · no buzz
Researchers in the Wender Lab at Stanford recently discovered a new drug that could be used to combat HIV infections. This drug is part of a larger class of compounds designed to target what family of viruses, which function by injecting their RNA genome into the DNA of the host cell?
gold answer: Retroviruses / Retroviridae
heardbot's guessP(correct)
0 (0%)— 0%
3 (6%)— 0%
6 (12%)— 0%
9 (18%)— 0%
12 (24%)— 0%
15 (30%)— 0%
18 (36%)— 0%
21 (42%)— 0%
24 (48%)— 0%
27 (54%)— 0%
30 (60%)— 0%
33 (66%)— 0%
36 (72%)— 1%
39 (78%)— 1%
42 (84%)— 1%
45 (90%)— 1%
48 (96%)Retroviruses ✓ 62%
50 (100%)Retroviruses ✓ 75%
CHEMISTRYtexas_sci_bowl_2025 — abstained (never confident) · no buzz
By name or number, order the following 3 carboxylic [READ: car-box-ILL-ick ] acid derivatives by increasing electrophilicity [READ: electro-fill-IH-si-tee]: 1) Anhydride 2) Acid chloride 3) Ester
gold answer: 3, 1, 2
heardbot's guessP(correct)
0 (0%)— 0%
3 (12%)— 0%
6 (24%)— 0%
9 (36%)— 0%
12 (48%)— 1%
15 (60%)— 1%
18 (72%)— 1%
21 (84%)— 1%
24 (96%)— 1%
25 (100%)3, 1, 2 ✓ 77%
MATHBASIS Peoria Rounds — abstained (never confident) · no buzz
Simplify the expression [read: the square root of x times 𝑥 the cube root of x all over x].
gold answer: 𝑥 −1 6
heardbot's guessP(correct)
0 (0%)— 0%
3 (17%)— 0%
6 (33%)— 0%
9 (50%)— 0%
12 (67%)The expression is √x · x^(1/3 ✗ 60%
15 (83%)— 1%
18 (100%)I need to simplify √x · ∛x ✗ 76%
MATHBerkeley-2023 — abstained (never confident) · no buzz
What is the sum of the factors of the number 78?
gold answer: 168
heardbot's guessP(correct)
0 (0%)— 0%
3 (30%)— 0%
6 (60%)— 1%
9 (90%)— 1%
10 (100%)🧮 168 ✓ 79%
PHYSICSIGNIS 2022 — abstained (never confident) · no buzz
What is the ratio between the energy of the firstexcited state and the third-excited state of a rigid rotor?
gold answer: 16
heardbot's guessP(correct)
0 (0%)— 0%
3 (17%)— 1%
6 (33%)— 1%
9 (50%)— 1%
12 (67%)— 1%
15 (83%)— 2%
18 (100%)— 2%
PHYSICSLexSciBowl — abstained (never confident) · no buzz
By name or number, order the following 3 objects in increasing order by the time it takes to roll down a ramp without slipping if they have the same mass: 1) Disk with radius 2; 2) Sphere with radius 1; 3) Rod with length 4.
gold answer: 3, 2, 1
heardbot's guessP(correct)
0 (0%)— 0%
3 (7%)— 0%
6 (14%)— 0%
9 (20%)— 0%
12 (27%)— 0%
15 (34%)— 0%
18 (41%)— 0%
21 (48%)— 0%
24 (55%)— 0%
27 (61%)— 1%
30 (68%)— 1%
33 (75%)— 1%
36 (82%)— 1%
39 (89%)— 1%
42 (95%)— 1%
44 (100%)— 1%
CHEMISTRYMOSFET-2 — abstained (never confident) · no buzz
What is the oxidation state of the central iron atom in the complex ion FeCl63- ?
gold answer: +3 / 3
heardbot's guessP(correct)
0 (0%)— 0%
3 (20%)— 0%
6 (40%)— 1%
9 (60%)— 1%
12 (80%)— 1%
15 (100%)🧮 3 ✓ 79%
MATHNNHS Rounds — abstained (never confident) · no buzz
Five fair, six-sided dice are rolled. What is the probability that the sum of the numbers rolled is a multiple of three?
gold answer: 1/3
heardbot's guessP(correct)
0 (0%)— 0%
3 (14%)— 0%
6 (29%)— 0%
9 (43%)— 0%
12 (57%)— 0%
15 (71%)— 0%
18 (86%)— 1%
21 (100%)— 1%
MATHNSBA2 — abstained (never confident) · no buzz
Alice shuffles a normal deck of cards and draws cards without replacement until she gets a red card. What is the probability that she has to draw exactly two cards?
gold answer: 13/51
heardbot's guessP(correct)
0 (0%)— 0%
3 (10%)— 0%
6 (21%)— 0%
9 (31%)— 0%
12 (41%)— 0%
15 (52%)— 0%
18 (62%)— 0%
21 (72%)— 0%
24 (83%)— 0%
27 (93%)— 0%
29 (100%)— 1%
ENERGYSBST (Spring) — abstained (never confident) · no buzz
Scientists at Pacific Northwest National Lab have developed a model for the multistep dissolution of gibbsite, one of the polymorphs of aluminum hydroxide. Identify all of the following three statements about aluminum hydroxide that are true: 1) Its solid form is held together by hydrogen bonds; 2) When aluminum hydroxide is reacted with acid, the aluminate ion is formed; 3) Aluminum hydroxide is amphoteric.
gold answer: 1, 3
heardbot's guessP(correct)
0 (0%)— 0%
3 (5%)— 0%
6 (10%)— 0%
9 (14%)— 0%
12 (19%)— 0%
15 (24%)Gibbsite is Al(OH)₃, ✗ 32%
18 (29%)— 0%
21 (33%)aluminum hydroxide ✗ 44%
24 (38%)— 0%
27 (43%)— 1%
30 (48%)— 1%
33 (52%)— 1%
36 (57%)— 1%
39 (62%)— 1%
42 (67%)— 1%
45 (71%)— 1%
48 (76%)— 1%
51 (81%)— 1%
54 (86%)— 1%
57 (90%)— 1%
60 (95%)— 1%
63 (100%)Let me analyze each statement: ✗ 73%
CHEMISTRYAVES-2025 — abstained (never confident) · no buzz
Identify all of the following three crown ethers that are correctly paired with the ion they typically solvate. 1) 15-crown-5 and Li+ 2) 18-crown-6 and Na+ 3) 21-crown-7 and K+
gold answer: None of them
heardbot's guessP(correct)
0 (0%)— 0%
3 (10%)— 0%
6 (21%)— 0%
9 (31%)— 0%
12 (41%)— 0%
15 (52%)— 0%
18 (62%)— 0%
21 (72%)— 1%
24 (83%)2 only ✗ 60%
27 (93%)— 1%
29 (100%)3 only ✗ 73%
MATHFE!M-2025 — abstained (never confident) · no buzz
A fixed point 𝑥 of a function 𝑓 satisfies the equation 𝑓(𝑥) = 𝑥. Which of the following functions have fixed points? 1) 𝑒𝑥 2) ln 𝑥 3) cos 𝑥
gold answer: 3 only
heardbot's guessP(correct)
0 (0%)— 0%
3 (10%)— 0%
6 (21%)— 0%
9 (31%)f(x) = x ✗ 21%
12 (41%)x ✗ 31%
15 (52%)— 0%
18 (62%)— 0%
21 (72%)— 0%
24 (83%)— 0%
27 (93%)2 only ✗ 56%
29 (100%)🧮 3) cos x only ✓ 74%
CHEMISTRYIGNIS 2022 — abstained (never confident) · no buzz
Identify all of the following three statements that are true of nucleophilic substitution reactions: 1) SN 2 reactions occur in a single step; 2) SN 1 reactions always lead to inversion of stereochemistry; 3) SN 2 reactions are favored by polar protic solvents.
gold answer: 1 only
heardbot's guessP(correct)
0 (0%)— 0%
3 (7%)— 0%
6 (14%)— 0%
9 (21%)— 0%
12 (29%)— 0%
15 (36%)— 0%
18 (43%)— 0%
21 (50%)1 and 2 ✗ 38%
24 (57%)1 and 2 ✗ 54%
27 (64%)1 and 2 ✗ 70%
30 (71%)1 and 3 ✗ 54%
33 (79%)1 only ✓ 65%
36 (86%)1 only ✓ 78%
39 (93%)1 and 3 ✗ 69%
42 (100%)1 only ✓ 71%
PHYSICSMIT-2022 — abstained (never confident) · no buzz
Doubly ionized lithium consists of a lithium nucleus and a single electron. To the nearest ten electronvolts, what is the absolute value of the ground state energy of doubly ionized lithium?
gold answer: 120
heardbot's guessP(correct)
0 (0%)— 0%
3 (10%)Hydrogen-like atom ✗ 54%
6 (20%)Hydrogen-like atom ✗ 72%
9 (30%)single electron ✗ 66%
12 (40%)— 1%
15 (50%)— 1%
18 (60%)For doubly ionized lithium ✗ 78%
21 (70%)— 2%
24 (80%)— 2%
27 (90%)— 2%
30 (100%)— 3%
MATHMOSFET-2 — abstained (never confident) · no buzz
What is the slope of a line perpendicular to the line with equation 7x – 4y = –28?
gold answer: -4/7
heardbot's guessP(correct)
0 (0%)— 0%
3 (18%)— 0%
6 (35%)— 0%
9 (53%)— 0%
12 (71%)— 0%
15 (88%)🧮 -4/7 ✓ 62%
17 (100%)🧮 -4/7 ✓ 79%
MATHNSBA1 — abstained (never confident) · no buzz
Identify all of the following 3 polynomials that are irreducible over the integers: 1) x2 + 3x - 12; 2) x2 + 15; 3) x2 - 15.
gold answer: ALL
heardbot's guessP(correct)
0 (0%)— 0%
3 (12%)— 0%
6 (23%)— 0%
9 (35%)— 0%
12 (46%)— 0%
15 (58%)— 0%
18 (69%)— 0%
21 (81%)1 and 2 ✗ 55%
24 (92%)1 and 2 ✗ 74%
26 (100%)— 1%
MATHRandom Stuff — abstained (never confident) · no buzz
In a recursive sequence where a(n) = a(n-1) + a(n-2), what is a(4) if a(1) equals 1 and a(2) equals 4?
gold answer: 9
heardbot's guessP(correct)
0 (0%)— 0%
3 (15%)— 0%
6 (30%)— 0%
9 (45%)Fibonacci sequence ✗ 49%
12 (60%)— 1%
15 (75%)— 1%
18 (90%)🧮 3 ✗ 68%
20 (100%)🧮 9 ✓ 75%
MATHSCB-2025 — abstained (never confident) · no buzz
Identify all of the following 4 values of n that would satisfy the equation n^4 is congruent to 1 mod 5. 1) 12 2) 13 3) 14 4) 15
gold answer: 1, 2, and 3
heardbot's guessP(correct)
0 (0%)— 0%
3 (11%)— 0%
6 (21%)— 0%
9 (32%)— 0%
12 (43%)— 0%
15 (54%)— 0%
18 (64%)🧮 [1, 2, 3, 4] ✗ 35%
21 (75%)🧮 [1, 2, 3, 4] ✗ 55%
24 (86%)— 0%
27 (96%)🧮 1, 2, 3 ✓ 54%
28 (100%)🧮 [12, 13, 14] ✗ 61%
MATHSBST (Spring) — abstained (never confident) · no buzz
A diagonal of a regular hexagon measures 6 cm. What is the ratio of the largest possible area of the hexagon to the smallest possible area of the hexagon?
gold answer: 4/3
heardbot's guessP(correct)
0 (0%)— 0%
3 (11%)— 0%
6 (21%)— 0%
9 (32%)🧮 23.38 ✗ 26%
12 (43%)🧮 3 ✗ 35%
15 (54%)— 0%
18 (64%)— 0%
21 (75%)— 0%
24 (86%)🧮 4/3 ✓ 58%
27 (96%)— 1%
28 (100%)— 1%
MATHSMH-2025 — abstained (never confident) · no buzz
A student has a 60% in the class before the final. If the final is worth 20% of the class grade, and this is the only remaining assignment to be graded, what is the minimum score the student needs to increase his grade by 5%?
gold answer: 85%
heardbot's guessP(correct)
0 (0%)— 0%
3 (7%)— 0%
6 (14%)— 0%
9 (20%)— 0%
12 (27%)🧮 90 ✗ 17%
15 (34%)🧮 90 ✗ 29%
18 (41%)🧮 110 ✗ 27%
21 (48%)🧮 68 ✗ 37%
24 (55%)🧮 110 ✗ 39%
27 (61%)🧮 110 ✗ 55%
30 (68%)🧮 110 ✗ 70%
33 (75%)🧮 68 ✗ 45%
36 (82%)🧮 110 ✗ 48%
39 (89%)🧮 110 ✗ 64%
42 (95%)🧮 61 ✗ 61%
44 (100%)🧮 85 ✓ 71%
MATHStanford_2025 — abstained (never confident) · no buzz
The degree measures of the angles of a triangle can be expressed as x, 2x − 20, and x − 40. What is the value of x?
gold answer: 60
heardbot's guessP(correct)
0 (0%)— 0%
3 (12%)— 0%
6 (23%)— 0%
9 (35%)— 0%
12 (46%)— 0%
15 (58%)— 0%
18 (69%)🧮 50 ✗ 42%
21 (81%)🧮 100 ✗ 55%
24 (92%)🧮 60 ✓ 67%
26 (100%)🧮 60 ✓ 80%