🧠 Science Quiz Zone

1. What is the chemical symbol for water?

2. Which planet is known as the Red Planet?

3. What gas do humans exhale?

4. What is the powerhouse of the cell?

5. Which element has the atomic number 1?

6. What is the speed of light in a vacuum?

7. Which organ is responsible for pumping blood in the human body?

8. What is the chemical formula for table salt?

9. Which planet is closest to the Sun?

10. What is the process by which plants make their own food?

11. What is the largest planet in our solar system?

12. What is the boiling point of water at sea level?

13. Which scientist proposed the theory of relativity?

14. What is the unit of electrical resistance?

15. Which gas is most abundant in Earth's atmosphere?

16. What is the process of water turning into vapor?

17. Which bone is the longest in the human body?