15 science trivia questions covering biology, physics, and space.

Free science trivia spanning biology, physics, chemistry, and space. Tap any question to reveal the answer — good for classroom warm-ups or testing what you actually remember.

1.What is the chemical symbol for gold?Tap to reveal

Au.

2.Which planet has the shortest day, or fastest rotation, in the solar system?Tap to reveal

Jupiter.

3.What part of the cell is often called its "powerhouse"?Tap to reveal

The mitochondria.

4.What force keeps planets in orbit around the sun?Tap to reveal

Gravity.

5.Which gas do plants absorb from the atmosphere during photosynthesis?Tap to reveal

Carbon dioxide.

6.What is the hardest naturally occurring substance on Earth?Tap to reveal

Diamond.

7.How many bones are in the adult human body?Tap to reveal

206.

8.Roughly how fast does light travel in a vacuum?Tap to reveal

About 300,000 kilometers (186,000 miles) per second.

9.Which scientist developed the theory of general relativity?Tap to reveal

Albert Einstein.

10.Which type of blood cell is primarily responsible for fighting infection?Tap to reveal

White blood cells.

11.Which organ pumps blood throughout the human body?Tap to reveal

The heart.

12.What is the process by which plants make their own food using sunlight called?Tap to reveal

Photosynthesis.

13.Which planet is often called Earth's "twin" due to its similar size?Tap to reveal

Venus.

14.What natural phenomenon is caused by light reflecting and refracting through water droplets?Tap to reveal

A rainbow.

15.What is the boiling point of water in Celsius at sea level?Tap to reveal

100 degrees Celsius.

Common questions

What topics does this cover?

Biology, physics, chemistry, and space — a general science mix rather than one narrow subject.

Is this trivia easy or hard?

It's aimed at a general audience, not scientists — a mix of well-known facts and a few trickier ones.

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