11. Which gas do plants primarily absorb during photosynthesis?
a. Oxygen
b. Nitrogen
c. Carbon dioxide
d. Hydrogen
Answer: c. Carbon dioxide
12. What is the SI unit of force?
a. Newton
b. Watt
c. Joule
d. Pascal
Answer: a. Newton
13. Which vitamin is synthesized in the skin when exposed to sunlight?
a. Vitamin A
b. Vitamin C
c. Vitamin D
d. Vitamin K
Answer: c. Vitamin D
14. Which of the following is a greenhouse gas?
a. Oxygen
b. Nitrogen
c. Carbon dioxide
d. Helium
Answer: c. Carbon dioxide
15. What is the SI unit of energy?
a. Joule
b. Watt
c. Newton
d. Kilogram
Answer: a. Joule
16. What is the chemical symbol for iron?
a. I
b. Ir
c. Fe
d. In
Answer: c. Fe
17. Which of the following is a renewable energy source?
a. Coal
b. Natural gas
c. Solar power
d. Nuclear power
Answer: c. Solar power
18. What is the pH level of pure water?
a. 5
b. 7
c. 10
d. 14
Answer: b. 7
19. Which blood vessels carry blood away from the heart?
a. Arteries
b. Veins
c. Capillaries
d. Venules
Answer: a. Arteries
20. Which law of motion is also known as the law of inertia?
a. First Law
b. Second Law
c. Third Law
d. Fourth Law
Answer: a. First Law