10 reviewed questions · mixed difficulty

Science Trivia Questions With Answers

Science trivia becomes more useful when an answer connects to a principle. This set covers cells, measurement, matter, forces, and the human body with a short explanation after every question.

By QZify Editorial Team · Published 2026-08-19 · Reviewed 2026-08-19

From cells to physical laws

The questions sample several branches of science instead of focusing on a single school subject.

Check the conditions

Scientific facts can depend on temperature, pressure, or definitions. Where that matters, the question states the relevant condition.

Questions and answers

Test yourself before opening each answer

Make your choice first, then open the answer to see a clear explanation.

Biologymedium
1. Which cell structures produce most ATP during aerobic respiration?
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Answer: Mitochondria
Mitochondria use oxygen-dependent processes to generate much of a eukaryotic cell's ATP.
Source: Encyclopaedia Britannica
Physicshard
2. What is the speed of light in a vacuum to the nearest kilometre per second?
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Answer: About 299,792 kilometres per second
The exact defined value is 299,792,458 metres per second.
Source: BIPM SI Brochure
Chemistrymedium
3. What is the pH of pure water at about 25 °C?
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Answer: 7
At this temperature pure water is neutral, with equal hydrogen and hydroxide ion concentrations.
Source: Encyclopaedia Britannica
Biologyeasy
4. What shape describes the overall structure of DNA?
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Answer: A double helix
Two nucleotide strands wind around each other in the familiar double-helical structure.
Source: Encyclopaedia Britannica
Chemistryeasy
5. At sea-level pressure, at what temperature does pure water boil on the Celsius scale?
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Answer: 100 degrees Celsius
Lower air pressure at altitude reduces the boiling temperature.
Source: Encyclopaedia Britannica
Physicseasy
6. Which force keeps planets in orbit around the Sun?
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Answer: Gravity
The Sun's gravity continually bends each planet's motion into an orbit.
Source: NASA Science
Biologyeasy
7. Which gas do plants take in for photosynthesis?
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Answer: Carbon dioxide
Plants use carbon dioxide and water to make carbohydrates, releasing oxygen as a by-product.
Source: Encyclopaedia Britannica
Materials sciencemedium
8. What is the hardest naturally occurring material?
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Answer: Diamond
Its carbon atoms form a strong three-dimensional crystal lattice.
Source: Encyclopaedia Britannica
Physicsmedium
9. What is the SI base unit of electric current?
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Answer: The ampere
The ampere, symbol A, is one of the seven SI base units.
Source: BIPM SI Brochure
Human bodymedium
10. Which organ produces the hormone insulin?
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Answer: The pancreas
Beta cells in pancreatic islets release insulin to help regulate blood glucose.
Source: Encyclopaedia Britannica