Megan Moran Quizzes

Science quiz

An animal with three hearts, a planet that spins on its side and a metal that pours like water: science is stranger than fiction. These 20 questions cover physics, chemistry, biology, space and the human body. Test yourself, then see if your family and friends can beat your score.

A free quiz from Megan Moran, author of The Mega Science Quiz Book.

Pick an answer to start20 to go

  1. Question 1 of 20Chemistry

    What is the chemical symbol for gold?

  2. Question 2 of 20Biology

    How many hearts does an octopus have?

  3. Question 3 of 20Space

    Which planet is known as the Red Planet?

  4. Question 4 of 20Physics

    What is the SI unit of electrical resistance?

  5. Question 5 of 20Biology

    Which gas do plants take in from the air to make their food by photosynthesis?

  6. Question 6 of 20Space

    After the Sun, which is the nearest known star to Earth?

  7. Question 7 of 20Chemistry

    Which metal is liquid at ordinary room temperature?

  8. Question 8 of 20Earth Science

    Which gas makes up the largest share of Earth's atmosphere?

  9. Question 9 of 20Space

    Which planet is tilted so far over that it essentially spins on its side?

  10. Question 10 of 20Biology

    Which structures, often called the powerhouses of the cell, release energy from food?

  11. Question 11 of 20Physics

    Absolute zero, or 0 kelvin, is equal to which temperature?

  12. Question 12 of 20Famous Scientists

    Marie Curie won her first Nobel Prize, in physics, in 1903. In which field did she win her second, in 1911?

  13. Question 13 of 20Human Body

    How many bones are in a typical adult human skeleton?

  14. Question 14 of 20Famous Scientists

    Which scientist discovered penicillin in 1928?

  15. Question 15 of 20Space

    Which is the largest planet in our solar system?

  16. Question 16 of 20Earth Science

    What type of rock forms when molten magma or lava cools and hardens?

  17. Question 17 of 20Physics

    At sea level, at what temperature does pure water boil?

  18. Question 18 of 20Human Body

    Which blood type is known as the universal donor for red blood cells?

  19. Question 19 of 20Space

    Roughly how long does sunlight take to reach Earth?

  20. Question 20 of 20Human Body

    Which part of the brain is mainly responsible for coordinating balance and smooth movement?

Answer all 20 to see your score.

Want more? The Mega Science Quiz Book has over 800 questions like these, ready for your next quiz night.

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Show all the answers
  1. What is the chemical symbol for gold? Au
  2. How many hearts does an octopus have? Three
  3. Which planet is known as the Red Planet? Mars
  4. What is the SI unit of electrical resistance? Ohm
  5. Which gas do plants take in from the air to make their food by photosynthesis? Carbon dioxide
  6. After the Sun, which is the nearest known star to Earth? Proxima Centauri
  7. Which metal is liquid at ordinary room temperature? Mercury
  8. Which gas makes up the largest share of Earth's atmosphere? Nitrogen
  9. Which planet is tilted so far over that it essentially spins on its side? Uranus
  10. Which structures, often called the powerhouses of the cell, release energy from food? Mitochondria
  11. Absolute zero, or 0 kelvin, is equal to which temperature? −273.15 °C (−459.67 °F)
  12. Marie Curie won her first Nobel Prize, in physics, in 1903. In which field did she win her second, in 1911? Chemistry
  13. How many bones are in a typical adult human skeleton? 206
  14. Which scientist discovered penicillin in 1928? Alexander Fleming
  15. Which is the largest planet in our solar system? Jupiter
  16. What type of rock forms when molten magma or lava cools and hardens? Igneous
  17. At sea level, at what temperature does pure water boil? 100 °C (212 °F)
  18. Which blood type is known as the universal donor for red blood cells? O negative
  19. Roughly how long does sunlight take to reach Earth? About 8 minutes
  20. Which part of the brain is mainly responsible for coordinating balance and smooth movement? Cerebellum