Question

I. Select the correct option:
1. A greenhouse gas that absorbs energy and maintains earth's temperature is
(a) Oxygen O (b) Nitrogen 0 (c) Carbon dioxide (d) Argon
2. Combustion cannot take place without
(a) Water n (b) Carbon o (c) Zinc
(d) Air
3. Which of the following is NOT a noble gas?
(a) Hydrogen 0 (b) Argon o (c) Krypton
(d) Helium
4. Acid rain is caused by which of the following?
(a) Carbon dioxide
(b) Lead
(C) Carbon monoxide
(d) All of the above
5. The process by which oxidation of food in our body takes place is called
(a) Photosynthesis
(b) Decomposition
(c) Respiration
(d) Combustion​

Answer 1

1. nitrogen
2. air
3. hydrogen
4. all of the above
5. respiration