The most abundant element present in the human body is:

(A) Nitrogen
(B) Carbon
(C) Hydrogen
(D) Oxygen

Q. The most abundant element present in the earth’s crust is:
(A) Carbon
(B) Hydrogen
(C) Oxygen
(D) Nitrogen

Q. What is the atomic number of Oxygen?
(A) 8
(B) 9
(C) 10
(D) 11

Answers:
1. (D) Oxygen
2. (C) Oxygen
3. (A) 8