30 Science Trivia Questions and Answers

Science is everywhere — from the smartphone in your hand to the stars above your head. These 30 science trivia questions span biology, chemistry, physics, and astronomy, making them perfect for a science round at quiz night or as a revision tool.

Biology

1. What is the basic unit of life? The cell
2. How many chambers does the human heart have? Four
3. What is the longest bone in the human body? The femur (thigh bone)
4. What do red blood cells carry around the body? Oxygen
5. What is the process by which plants make food from sunlight? Photosynthesis
6. How many pairs of chromosomes do humans have? 23

Chemistry

1. What is H₂O? Water
2. What is the atomic number of carbon? 6
3. Which element has the symbol Fe? Iron
4. What gas do humans exhale? Carbon dioxide (CO₂)
5. What is the pH of a neutral substance? 7
6. Which is the most reactive metal on the periodic table? Francium (or Caesium in practical terms)

Physics

1. What is the SI unit of force? Newton (N)
2. What is the speed of sound in air at sea level (approx.)? 343 m/s
3. What type of energy is stored in a stretched elastic band? Elastic potential energy
4. Who developed the theory of general relativity? Albert Einstein
5. What does E=mc² mean in simple terms? Energy equals mass times the speed of light squared
6. Ohm's Law relates which three quantities? Voltage, current, and resistance

Astronomy & Space

1. How many planets are in our solar system? Eight
2. What is the name of Earth's natural satellite? The Moon
3. Which planet has the most moons? Saturn
4. What is the closest star to Earth (other than the Sun)? Proxima Centauri
5. What is a light year a measure of? Distance
6. In which year did humans first land on the Moon? 1969

Earth Science & Environment

1. What is the name of the layer of rock that makes up Earth's outer shell? The crust
2. What is the most common gas in Earth's atmosphere? Nitrogen (about 78%)
3. What causes the tides? The gravitational pull of the Moon (and Sun)
4. What type of rock is formed from cooled lava? Igneous rock
5. What is the Richter scale used to measure? The magnitude of earthquakes
6. Approximately how old is the Earth? 4.5 billion years

Go Deeper

Science trivia rewards curiosity. The more you quiz, the more connections you notice between subjects. Explore our science quiz collection on DoQuizzes — from basic biology to mind-bending physics — and keep building your knowledge, one question at a time.