From gravity to the chemical symbols, this set covers the science everyone meets in school and in the news. Perfect for students and curious minds alike.
Updated October 9, 2026
Science Trivia
Twenty original science questions from the planets to the human body. Test yourself in quiz mode with answers, explanations, and score tracking.
Question 1. What force pulls objects toward Earth?
Answer: Gravity
Gravity is what gives physical objects their weight.
Question 2. What is H2O commonly known as?
Answer: Water
Each water molecule has two hydrogen atoms and one oxygen atom.
Question 3. Which planet is closest to the Sun?
Answer: Mercury
Mercury completes an orbit of the Sun in just 88 days.
Question 4. What part of the cell contains DNA?
Answer: The nucleus
The nucleus acts as the cell's control center.
Question 5. What do we call a scientist who studies stars and planets?
Answer: An astronomer
Astronomy is one of the oldest sciences in human history.
Question 6. About how long does sunlight take to reach Earth?
Answer: About 8 minutes
Light travels 150 million kilometers at 300,000 km per second.
Question 7. What is the center of an atom called?
Answer: The nucleus
Protons and neutrons are packed into the tiny nucleus.
Question 8. Which gas makes up most of Earth's atmosphere?
Answer: Nitrogen
About 78 percent of the air is nitrogen; oxygen is about 21 percent.
Question 9. What is the boiling point of water at sea level?
Answer: 100 degrees Celsius
That is 212 Fahrenheit; the boiling point drops at higher altitudes.
Question 10. What do we call animals that eat only plants?
Answer: Herbivores
Cows, deer, and rabbits are all herbivores.
Question 11. Which blood cells carry oxygen around the body?
Answer: Red blood cells
The protein hemoglobin inside them binds to oxygen.
Question 12. What is the largest organ of the human body?
Answer: The skin
An adult's skin covers about 2 square meters.
Question 13. How many bones are in the adult human body?
Answer: 206
Babies are born with about 300 bones, which fuse as they grow.
Question 14. What mainly causes ocean tides?
Answer: The Moon's gravity
The Sun's gravity plays a smaller supporting role.
Question 15. What is the chemical symbol for gold?
Answer: Au
It comes from aurum, the Latin word for gold.
Question 16. Which planet has the most known moons?
Answer: Saturn
Saturn has more than 140 confirmed moons.
Question 17. What do we call water falling from clouds?
Answer: Precipitation
Precipitation includes rain, snow, sleet, and hail.
Question 18. What unit measures electrical resistance?
Answer: The ohm
It is named after German physicist Georg Ohm.
Question 19. Which vitamin does sunlight help your body produce?
Answer: Vitamin D
Skin produces vitamin D when exposed to ultraviolet light.
Question 20. What is the study of earthquakes called?
Answer: Seismology
Seismologists measure quakes with instruments called seismographs.
Frequently asked questions
How do I play the quiz?
Read each question, say your answer out loud, then press Reveal answer. Mark whether you got it right and move to the next question. Your score is tracked to the end.
Are these questions suitable for students?
Yes. They cover standard school science topics and each answer includes a one-line explanation that reinforces the concept.
How many questions are in this quiz?
20, each with an answer and a one-line explanation.
Can I reuse these questions?
Yes. All questions are original and free to use for quizzes, classrooms, and trivia nights.