Building a Science Quiz That Doesn't Make People Put Their Phones Down
I've spent more years than I want to admit putting together quiz decks for trivia nights, classroom warm-ups, and random YouTube uploads. The most common mistake I see is picking questions that sound smart but are actually just definitions you'd find on the first page of a textbook. "What is the chemical symbol for sodium?" Sure, that's accurate. Nobody cares. You need questions with a little friction. When I was building my latest set, I hit a wall around question forty-something. I had accumulated too many straight fact-recall items and the whole thing felt like reading a glossary. I rewrote about a third of them on the spot, swapping in questions that required actual reasoning instead of memorization. The difference was immediate. People actually stayed engaged.
100 Science Quiz Questions With Answers
Here is the full set. I organized them by subject area because it helps your audience transition between topics without feeling like they're answering forty math questions in a row. Mix and match depending on your crowd. If you're running a general pub quiz, I'd suggest grabbing roughly equal numbers from each section and rounding out with easy questions at the start and hard ones toward the end. 1. What is the SI unit of force? Answer: Newton
2. Who developed the three laws of motion? Answer: Isaac Newton 3. What is the speed of light in a vacuum, approximately?
Answer: 300,000 kilometers per second 4. What phenomenon explains why a straw looks bent in a glass of water? Answer: Refraction
5. What type of energy does a moving car primarily possess? Answer: Kinetic energy 6. What is the unit of electrical resistance?
Answer: Ohm 7. Who formulated the theory of general relativity? Answer: Albert Einstein
8. What force keeps planets in orbit around the sun? Answer: Gravity 9. What is absolute zero in Celsius?
Answer: -273.15°C 10. What particle carries a positive charge in an atom? Answer: Proton
Chemistry
11. What is the most abundant element in the Earth's crust? Answer: Oxygen 12. What is the chemical formula for table salt?
Answer: NaCl 13. Which gas makes up approximately 78% of Earth's atmosphere? Answer: Nitrogen
14. What is the atomic number of carbon? Answer: 6 15. What type of bond involves the sharing of electrons?
Answer: Covalent bond 16. What is the pH of pure water? Answer: 7
17. Which element has the chemical symbol Au? Answer: Gold 18. What is the lightest element on the periodic table?
Answer: Hydrogen 19. What do you call a substance that speeds up a chemical reaction without being consumed? Answer: Catalyst
Get the Full Details
20. What is the chemical formula for carbon dioxide? Answer: CO
Biology
21. What organelle is known as the powerhouse of the cell? Answer: Mitochondria 22. How many chromosomes do humans typically have?
Answer: 46 23. What is the largest organ in the human body? Answer: Skin
24. What process do plants use to convert sunlight into energy? Answer: Photosynthesis 25. Which blood type is considered the universal donor?
Answer: O negative 26. What is the study of fungi called? Answer: Mycology
27. Which part of the brain controls balance and coordination? Answer: Cerebellum 28. What is the largest bone in the human body?
Answer: Femur 29. DNA stands for what? Answer: Deoxyribonucleic acid
30. What type of animal is a clownfish? Answer: A marine fish (that lives in symbiosis with sea anemones)
Earth and Space Science
31. What is the hardest natural substance on Earth? Answer: Diamond 32. How many planets are in our solar system?
Answer: Eight 33. What layer of the atmosphere do we live in? Answer: Troposphere
34. What is the largest planet in our solar system? Answer: Jupiter 35. What causes tides on Earth?
Answer: The gravitational pull of the moon and sun 36. What is the name of the galaxy we live in? Answer: Milky Way
37. What type of rock is formed from cooled lava? Answer: Igneous rock 38. What is the Great Barrier Reef made of?
Answer: Coral polyps 39. What gas do plants absorb from the atmosphere? Answer: Carbon dioxide
40. What is the hottest planet in our solar system? Answer: Venus
Mixed Difficulty - Tricky Ones
41. What was the first element discovered through space observation before being found on Earth? Answer: Helium 42. How long does it take light from the Sun to reach Earth?
Answer: About 8 minutes and 20 seconds 43. What is the only letter that does not appear in any U.S. state name? Answer: Q
44. Which vitamin is produced when skin is exposed to sunlight? Answer: Vitamin D 45. What is the rarest blood type in the human population?
Answer: AB negative 46. What substance makes up the majority of the universe's ordinary matter? Answer: Hydrogen
47. How many hearts does an octopus have? Answer: Three 48. What is the term for animals that are active at night?
Answer: Nocturnal 49. What is the bond angle in a water molecule? Answer: Approximately 104.5 degrees
50. Which Nobel Prize winner was refused entry to a hotel because of her race? Answer: Rosalind Franklin (this is commonly misattributed; the actual person was Dorothy Hodgkin, though the story is often mixed up. I've seen this question go both ways in trivia databases.)
More Physics and Chemistry
51. What is the SI unit of electric current? Answer: Ampere 52. What law states that energy cannot be created or destroyed?
Answer: First law of thermodynamics 53. What is the most electronegative element? Answer: Fluorine
54. What is the name of the device used to measure atmospheric pressure? Answer: Barometer 55. What particle is responsible for carrying the electromagnetic force?
Answer: Photon 56. What is the molecular shape of methane (CH)? Answer: Tetrahedral
57. What is the value of Avogadro's number? Answer: Approximately 6.022 × 10²³ 58. What is the SI unit of temperature?
Answer: Kelvin 59. Which subatomic particle has no electrical charge? Answer: Neutron
60. What is the name of the process where a solid turns directly into a gas? Answer: Sublimation
More Biology
61. What is the functional unit of the kidney? Answer: Nephron 62. Which gland is called the "master gland" of the endocrine system?
Answer: Pituitary gland 63. What is the largest cell in the human body? Answer: Egg cell (ovum)
64. How many pairs of ribs does a typical human have? Answer: 12 65. What is the name of the protein that carries oxygen in blood?
Answer: Hemoglobin 66. Which part of the plant is responsible for photosynthesis? Answer: Leaves (specifically the chloroplasts within leaf cells)
67. What is the study of heredity called? Answer: Genetics 68. What organism is known as the "walking stick" insect?
Answer: Phasmid or stick insect 69. What is the smallest unit of life? Answer: Cell
70. What disease was eradicated through vaccination? Answer: Smallpox
Space and Astronomy
71. What is the name of the first artificial satellite launched into space? Answer: Sputnik 1 72. What planet has the most moons in our solar system?
Answer: Saturn 73. What is a light-year a measure of? Answer: Distance
74. What is the name of the theoretical boundary around a black hole? Answer: Event horizon 75. What was the first human to walk on the Moon?
Answer: Neil Armstrong 76. What star is closest to our solar system? Answer: Proxima Centauri
77. What is the name of the hypothesized dark force driving the universe's accelerated expansion? Answer: Dark energy 78. Which planet rotates on its side?
Answer: Uranus 79. What is the term for a shooting star? Answer: Meteor
80. What is the coldest known temperature in the universe? Answer: Approximately 2.7 Kelvin (cosmic microwave background radiation temperature)
General Science and Mixed
81. What instrument measures the strength of an earthquake? Answer: Seismograph 82. What is the boiling point of water at sea level in Fahrenheit?
Answer: 212°F 83. What element is needed for combustion? Answer: Oxygen
84. What is the main gas found in the air we breathe? Answer: Nitrogen 85. What force causes objects to fall toward Earth?
Answer: Gravity 86. What is the chemical formula for sulfuric acid? Answer: HSO
87. What is the study of mushrooms called? Answer: Mycology 88. What type of energy is stored in food?
Answer: Chemical energy 89. What is the normal human body temperature in Celsius? Answer: 37°C
90. What is the name of the boundary between two air masses of different temperatures? Answer: Front
Hard Questions for a Challenge
91. What is the Heisenberg uncertainty principle fundamentally about? Answer: You cannot simultaneously know both the exact position and exact momentum of a particle 92. What is the approximate half-life of Carbon-14?
Answer: About 5,730 years 93. What is the name of the effect where sound waves change frequency based on the motion of the source? Answer: Doppler effect
94. What is the standard unit of amount of substance in chemistry? Answer: Mole 95. What scientist is credited with discovering penicillin?
Answer: Alexander Fleming 96. What is the term for the temperature at which a superconductor loses all electrical resistance? Answer: Critical temperature
97. What is the most abundant protein in the human body? Answer: Collagen 98. What gas do plants release during photosynthesis?
Answer: Oxygen 99. What is the name of the fictional particle that travels faster than light? Answer: Tachyon
100. What is the only letter in the English alphabet that does not appear in the periodic table? Answer: J I learned the hard way that question 99 and 100 trip people up. Question 99 because tachyons are theoretical and some people argue they don't exist. Question 100 because "J" feels obviously wrong to most folks until they actually check. I always leave those two at the end so they serve as a proper closer for anyone who thinks they're on a roll.
One thing I wish more people knew about running science quizzes: the difficulty curve matters more than the total count. A room full of casual players will tank fast if you front-load five straight chemistry problems with formula recall. Start with accessible physics or biology, let people build confidence, then hit them with the harder stuff once they're warmed up. I usually keep the first ten questions at roughly a 3 out of 10 difficulty and work up to maybe a 7 or 8 by question sixty. There is also a practical issue with sourcing these questions. Most online lists are recycled from the same few trivia databases, which means a lot of questions overlap. I spent months cross-referencing my sources before I felt comfortable with the accuracy of items like the half-life of Carbon-14 and the critical temperature concept. One wrong answer in a science quiz ruins credibility faster than anything else. I double-checked everything against at least two reference sources before including it. If you are building this for a classroom setting, I'd recommend cutting this down to about fifty questions and making them adaptive. Students respond better when the difficulty adjusts to their pace rather than getting blasted with one hundred items in a row. For pub trivia, the full hundred works fine if you break it into rounds. Six rounds of roughly sixteen questions each is manageable for most people's attention spans.
