100 Questions & Answers

100 Science Trivia Questions and Answers

Science is the ultimate trivia playground — it reaches into everything from what makes stars shine to why we sneeze in sunlight. This 100-question set covers physics, chemistry, biology, earth science, and the people who built modern science.

Questions are grouped by topic and ordered roughly from easy to expert. Tap each question to reveal the answer.

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Physics

  1. 1. What is the speed of light in a vacuum (m/s, approximately)? expand_more
    Answer: ~299,792,458 m/s.
  2. 2. Who proposed the theory of general relativity? expand_more
    Answer: Albert Einstein.
  3. 3. What particle has no electric charge? expand_more
    Answer: The neutron.
  4. 4. What is Newton's third law of motion? expand_more
    Answer: For every action, there is an equal and opposite reaction.
  5. 5. What unit is used to measure electrical resistance? expand_more
    Answer: The ohm.
  6. 6. What is the SI unit of force? expand_more
    Answer: The newton (N).
  7. 7. What fundamental force holds atomic nuclei together? expand_more
    Answer: The strong nuclear force.
  8. 8. What is the Heisenberg uncertainty principle about? expand_more
    Answer: A fundamental limit on simultaneously knowing a particle's position and momentum.
  9. 9. What does E=mc² represent? expand_more
    Answer: Mass–energy equivalence.
  10. 10. Who invented the alternating-current motor? expand_more
    Answer: Nikola Tesla.

Chemistry

  1. 11. What is the chemical symbol for gold? expand_more
    Answer: Au.
  2. 12. What element has the atomic number 1? expand_more
    Answer: Hydrogen.
  3. 13. What is the most abundant gas in Earth's atmosphere? expand_more
    Answer: Nitrogen.
  4. 14. Who created the periodic table? expand_more
    Answer: Dmitri Mendeleev.
  5. 15. What is the pH of pure water at 25°C? expand_more
    Answer: Seven.
  6. 16. What is H2SO4 commonly known as? expand_more
    Answer: Sulphuric acid.
  7. 17. What gas do humans exhale? expand_more
    Answer: Carbon dioxide.
  8. 18. What is the chemical symbol for sodium? expand_more
    Answer: Na.
  9. 19. What is the atomic number of carbon? expand_more
    Answer: 6.
  10. 20. What is the charge of a proton? expand_more
    Answer: Positive (+1 elementary charge).

Biology & Anatomy

  1. 21. What is the powerhouse of the cell? expand_more
    Answer: The mitochondrion.
  2. 22. How many chromosomes are in a typical human cell? expand_more
    Answer: 46 (23 pairs).
  3. 23. What is DNA the abbreviation for? expand_more
    Answer: Deoxyribonucleic acid.
  4. 24. What is the largest organ in the human body? expand_more
    Answer: The skin.
  5. 25. Who discovered penicillin? expand_more
    Answer: Alexander Fleming.
  6. 26. What blood type is known as the 'universal donor'? expand_more
    Answer: O negative.
  7. 27. Which system does the liver belong to? expand_more
    Answer: The digestive system (and endocrine).
  8. 28. What is photosynthesis? expand_more
    Answer: Plants converting sunlight, water, and CO₂ into glucose and oxygen.
  9. 29. How many bones are in the adult human body? expand_more
    Answer: 206.
  10. 30. Which part of the brain controls balance? expand_more
    Answer: The cerebellum.

Space & Astronomy

  1. 31. Which planet is known as the 'Red Planet'? expand_more
    Answer: Mars.
  2. 32. What is the largest planet in our solar system? expand_more
    Answer: Jupiter.
  3. 33. Who was the first person to walk on the Moon? expand_more
    Answer: Neil Armstrong.
  4. 34. What galaxy is Earth in? expand_more
    Answer: The Milky Way.
  5. 35. What is the name of NASA's Mars rover that landed in 2021? expand_more
    Answer: Perseverance.
  6. 36. What is a light-year? expand_more
    Answer: The distance light travels in one year (~9.46 trillion km).
  7. 37. How many planets are in our solar system? expand_more
    Answer: Eight.
  8. 38. What is the hottest planet in our solar system? expand_more
    Answer: Venus.
  9. 39. What is the boundary of a black hole called? expand_more
    Answer: The event horizon.
  10. 40. Which space telescope replaced Hubble as NASA's flagship? expand_more
    Answer: The James Webb Space Telescope.

Earth Science

  1. 41. What percentage of Earth's surface is covered by water? expand_more
    Answer: About 71%.
  2. 42. What causes tides on Earth? expand_more
    Answer: Gravitational pull from the Moon (and Sun).
  3. 43. What is the deepest point in the world's oceans? expand_more
    Answer: The Mariana Trench.
  4. 44. What type of rock is formed by cooling magma? expand_more
    Answer: Igneous rock.
  5. 45. What scale measures earthquake magnitude? expand_more
    Answer: The Richter scale (and moment magnitude scale).
  6. 46. What causes the seasons on Earth? expand_more
    Answer: The tilt of Earth's axis.
  7. 47. What is the outermost layer of Earth called? expand_more
    Answer: The crust.
  8. 48. What is the process of rock breaking down into smaller pieces called? expand_more
    Answer: Weathering.
  9. 49. What are the two types of glaciers? expand_more
    Answer: Alpine and continental (ice sheets).
  10. 50. What is the longest mountain range in the world? expand_more
    Answer: The Mid-Atlantic Ridge (underwater) or the Andes (above water).

Famous Scientists

  1. 51. Who developed the laws of motion and universal gravitation? expand_more
    Answer: Isaac Newton.
  2. 52. Which scientist proposed that species evolve via natural selection? expand_more
    Answer: Charles Darwin.
  3. 53. Who discovered radioactivity alongside her husband? expand_more
    Answer: Marie Curie.
  4. 54. Who built the first programmable computer? expand_more
    Answer: Often credited to Konrad Zuse (Z3, 1941).
  5. 55. Who is credited with proposing the heliocentric model? expand_more
    Answer: Nicolaus Copernicus.
  6. 56. Who discovered X-rays? expand_more
    Answer: Wilhelm Conrad Röntgen.
  7. 57. What was the nickname of physicist Richard Feynman? expand_more
    Answer: 'The Great Explainer'.
  8. 58. Which scientist is known for her work on DNA's structure (often under-credited)? expand_more
    Answer: Rosalind Franklin.
  9. 59. Who formulated the theory of plate tectonics? expand_more
    Answer: Alfred Wegener (continental drift) and later scientists built plate tectonics.
  10. 60. Which scientist invented the lightning rod and bifocal glasses? expand_more
    Answer: Benjamin Franklin.

Technology & Computing

  1. 61. What does CPU stand for? expand_more
    Answer: Central Processing Unit.
  2. 62. Who co-founded Apple with Steve Jobs? expand_more
    Answer: Steve Wozniak.
  3. 63. What does HTTP stand for? expand_more
    Answer: HyperText Transfer Protocol.
  4. 64. In what year was the first iPhone released? expand_more
    Answer: 2007.
  5. 65. Which programming language was created by Guido van Rossum? expand_more
    Answer: Python.
  6. 66. What does URL stand for? expand_more
    Answer: Uniform Resource Locator.
  7. 67. Who invented the World Wide Web? expand_more
    Answer: Tim Berners-Lee (1989).
  8. 68. What is the binary representation of decimal 10? expand_more
    Answer: 1010.
  9. 69. What does AI stand for? expand_more
    Answer: Artificial Intelligence.
  10. 70. What is Moore's Law? expand_more
    Answer: Transistor count on chips doubles roughly every two years.

Natural Phenomena

  1. 71. What causes a rainbow? expand_more
    Answer: Refraction and reflection of light in water droplets.
  2. 72. What is the aurora borealis? expand_more
    Answer: The northern lights — caused by charged particles from the sun interacting with Earth's atmosphere.
  3. 73. What makes thunder? expand_more
    Answer: Rapid expansion of air heated by a lightning bolt.
  4. 74. What is the Fujita scale used to measure? expand_more
    Answer: Tornado intensity.
  5. 75. What scale measures hurricane intensity? expand_more
    Answer: The Saffir–Simpson scale.
  6. 76. What is a solar eclipse? expand_more
    Answer: When the Moon passes between Earth and the Sun, blocking sunlight.
  7. 77. What phenomenon causes compass needles to point to magnetic north? expand_more
    Answer: Earth's magnetic field.
  8. 78. What is the 'Ring of Fire'? expand_more
    Answer: A Pacific Ocean zone of intense volcanic and seismic activity.
  9. 79. What is acid rain caused by? expand_more
    Answer: Sulphur dioxide and nitrogen oxides reacting with water in the atmosphere.
  10. 80. What natural disaster is caused by underwater seismic activity? expand_more
    Answer: A tsunami.

Units & Measurement

  1. 81. What unit is temperature measured in on the Kelvin scale? expand_more
    Answer: Kelvin (K).
  2. 82. What does SI stand for in 'SI units'? expand_more
    Answer: Système International (d'Unités) — the International System of Units.
  3. 83. What is the SI unit of length? expand_more
    Answer: The metre.
  4. 84. What is the SI unit of mass? expand_more
    Answer: The kilogram.
  5. 85. What is 0 Kelvin equal to in Celsius? expand_more
    Answer: -273.15°C.
  6. 86. How many atoms are in a mole of a substance (approximately)? expand_more
    Answer: 6.022 × 10²³ (Avogadro's number).
  7. 87. What is the SI unit of time? expand_more
    Answer: The second.
  8. 88. How is the Celsius scale defined at sea level? expand_more
    Answer: 0°C is the freezing point of water; 100°C is the boiling point.
  9. 89. What unit measures luminous intensity? expand_more
    Answer: The candela (cd).
  10. 90. What is the SI unit of electric current? expand_more
    Answer: The ampere (A).

Expert Science Trivia

  1. 91. What is the Chandrasekhar limit? expand_more
    Answer: The maximum stable mass of a white dwarf star (~1.4 solar masses).
  2. 92. Who is credited with discovering the structure of the atom with the gold foil experiment? expand_more
    Answer: Ernest Rutherford.
  3. 93. What is Schrödinger's cat a thought experiment for? expand_more
    Answer: The paradoxes of quantum superposition.
  4. 94. What is the CRISPR-Cas9 system used for? expand_more
    Answer: Precise gene editing.
  5. 95. Which element has the highest melting point? expand_more
    Answer: Tungsten.
  6. 96. What did the Michelson-Morley experiment fail to detect? expand_more
    Answer: The luminiferous aether.
  7. 97. What is 'entropy' in thermodynamics? expand_more
    Answer: A measure of disorder or randomness in a system.
  8. 98. Which theoretical physicist wrote 'A Brief History of Time'? expand_more
    Answer: Stephen Hawking.
  9. 99. What does the Drake equation estimate? expand_more
    Answer: The number of detectable extraterrestrial civilizations in our galaxy.
  10. 100. Which particle was confirmed at CERN in 2012? expand_more
    Answer: The Higgs boson.

That's 100 science trivia questions across physics, chemistry, biology, and more. For endless AI-generated science questions — fact-checked against live data — download Yabaleli free on iPhone and Android.

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