Master Biology, Chemistry, Physics & Earth Science in One Fun Activity
This 50 Science Quiz Questions covers biology, chemistry, physics, and earth science—perfect for test prep or classroom review. Each question includes four answer choices with the correct answer provided for self-checking.
Comment your score below after tallying your correct answers. Use this for individual study, group challenges, or bell-ringers. Share this quiz with classmates to compare results and learn together. Whether you’re in middle school or high school, this resource strengthens core science concepts and builds confidence for exams.
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Top 50 Science Quiz Questions with Answers
Results
#1. What is the center of an atom called?
#2. What is the largest organ in the human body?
#3. Which part of the human brain controls balance and coordination?
#4. What is the most abundant gas in Earth’s atmosphere?
#5. Which scientist discovered penicillin?
#6. What is the main function of the lungs?
#7. Which organ is responsible for filtering blood and producing urine?
#8. What does DNA stand for?
#9. Which of these is a mammal?
#10. Which of these is not a state of matter?
#11. Which planet is closest to the sun?
#12. What is the chemical symbol for gold?
#13. Which of these is a renewable energy source?
#14. Which part of the cell contains DNA?
#15. What is the process by which plants make food using sunlight?
#16. What is the pH value of pure water?
#17. Which metal is the best conductor of electricity?
#18. Which scientist developed the theory of evolution by natural selection?
#19. What is the hardest natural substance?
#20. What is the chemical symbol for sodium?
#21. Which planet is known as the Red Planet?
#22. What is the process of a liquid turning into a gas called?
#23. What is the unit of electric resistance?
#24. What is the freezing point of water in Celsius?
#25. What type of energy does a moving car have?
#26. What part of the plant conducts photosynthesis?
#27. Which element is liquid at room temperature?
#28. What is the largest planet in our solar system?
#29. Which is the smallest bone in the human body?
#30. What type of simple machine is a seesaw?
#31. What is the fastest land animal?
#32. Which vitamin is produced by the human skin when exposed to sunlight?
#33. What is the main gas found in the sun?
#34. Which force keeps planets in orbit around the sun?
#35. What is the main function of red blood cells?
#36. What is the basic unit of life?
#37. Which of these is an acid?
#38. Which of these is a vertebrate?
#39. What is the boiling point of water at sea level in Celsius?
#40. What is the chemical formula for water?
#41. What is the name of the galaxy that contains our solar system?
#42. Which planet is known as the “Morning Star” or “Evening Star”?
#43. Which of these is a carnivore?
#44. What type of energy is stored in a battery?
#45. Which of these animals lays eggs?
#46. Which organ pumps blood throughout the human body?
#47. What is the force that opposes motion between two surfaces?
#48. Which scientist is known for the theory of relativity?
#49. What gas do plants absorb from the air for photosynthesis?
#50. Which planet is known for its prominent rings?
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