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 main function of the lungs?
#2. Which organ pumps blood throughout the human body?
#3. What is the name of the galaxy that contains our solar system?
#4. What is the largest organ in the human body?
#5. What is the chemical symbol for sodium?
#6. What part of the plant conducts photosynthesis?
#7. What does DNA stand for?
#8. What gas do plants absorb from the air for photosynthesis?
#9. What is the main gas found in the sun?
#10. What type of energy does a moving car have?
#11. Which is the smallest bone in the human body?
#12. Which scientist is known for the theory of relativity?
#13. What is the most abundant gas in Earth’s atmosphere?
#14. Which metal is the best conductor of electricity?
#15. Which planet is closest to the sun?
#16. Which part of the cell contains DNA?
#17. What is the chemical formula for water?
#18. Which part of the human brain controls balance and coordination?
#19. Which scientist discovered penicillin?
#20. Which of these is not a state of matter?
#21. What is the unit of electric resistance?
#22. What is the boiling point of water at sea level in Celsius?
#23. What is the basic unit of life?
#24. What type of simple machine is a seesaw?
#25. Which element is liquid at room temperature?
#26. Which of these is a vertebrate?
#27. What is the fastest land animal?
#28. What is the center of an atom called?
#29. Which of these animals lays eggs?
#30. What type of energy is stored in a battery?
#31. What is the process by which plants make food using sunlight?
#32. What is the force that opposes motion between two surfaces?
#33. What is the freezing point of water in Celsius?
#34. Which of these is a renewable energy source?
#35. Which of these is an acid?
#36. What is the process of a liquid turning into a gas called?
#37. What is the chemical symbol for gold?
#38. Which planet is known as the “Morning Star” or “Evening Star”?
#39. Which planet is known as the Red Planet?
#40. Which planet is known for its prominent rings?
#41. What is the largest planet in our solar system?
#42. What is the hardest natural substance?
#43. Which vitamin is produced by the human skin when exposed to sunlight?
#44. Which organ is responsible for filtering blood and producing urine?
#45. Which scientist developed the theory of evolution by natural selection?
#46. Which of these is a mammal?
#47. What is the pH value of pure water?
#48. What is the main function of red blood cells?
#49. Which force keeps planets in orbit around the sun?
#50. Which of these is a carnivore?
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