Science Trivia Questions & Answers

Physics, chemistry, biology and space — bite-sized science trivia for curious minds.

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What it tests

Science trivia focuses on observable principles, major discoveries, the human body, space, elements, and technology encountered in daily life.

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Build from plain-language concepts: what a process does, where it occurs, and which scientist or unit is associated with it.

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Test understanding without requiring formulas or scientific names. Define the level of precision expected in the wording.

Questions follow our editorial standards for clear wording, verifiable answers, and fair accepted variants.

30 Science trivia questions

1. What is the chemical formula for table salt?

Answer: NaCl

2. How many planets are in our solar system?

Answer: 8

3. What gas do plants absorb from the atmosphere for photosynthesis?

Answer: Carbon Dioxide

4. What is the approximate speed of light in km per second?

Answer: 300000

5. What is the powerhouse of the cell?

Answer: Mitochondria

6. Which physicist formulated the law of universal gravitation?

Answer: Isaac Newton

7. How many pairs of chromosomes do humans have?

Answer: 23

8. What is the most abundant gas in Earth's atmosphere?

Answer: Nitrogen

9. Who proposed the theory of general relativity?

Answer: Albert Einstein

10. What is the lightest chemical element?

Answer: Hydrogen

11. What is absolute zero in degrees Celsius (rounded)?

Answer: -273

12. Which planet has the most moons (as of 2024)?

Answer: Saturn

13. What branch of science studies the interaction of matter and energy?

Answer: Physics

14. What particle carries the electromagnetic force?

Answer: Photon

15. What is the pH of pure water at 25°C?

Answer: 7

16. Which vitamin deficiency causes scurvy?

Answer: Vitamin C

17. What is the smallest bone in the human body?

Answer: Stapes

18. What shape is a DNA molecule commonly described as?

Answer: Helix

19. Which blood type is the universal plasma donor?

Answer: AB

20. What is the name of the galaxy nearest to the Milky Way?

Answer: Andromeda

21. How many bones are in the adult human hand?

Answer: 27

22. What element has the symbol 'K'?

Answer: Potassium

23. Which planet has the highest surface temperature?

Answer: Venus

24. Which organ produces insulin?

Answer: Pancreas

25. What is the largest species of shark?

Answer: Whale Shark

26. What is the SI unit of electric current?

Answer: Ampere

27. Which scientist discovered radioactivity along with Pierre and Marie Curie?

Answer: Henri Becquerel

28. What phenomenon causes the tides on Earth?

Answer: The Moon

29. Which planet has the Great Red Spot?

Answer: Jupiter

30. What force keeps planets in orbit around the Sun?

Answer: Gravity

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