set 2 MCQ Questions & Answers Detailed Explanation

Question : 1

Which of the following is/are the hazardous pollutant(s) present in automobile exhaust gases?

1. N₂
2. CO
3. CH₄
4. Oxides of nitrogen

a) 1 and 2

b) 2 and 3

c) 2 and 4

d) 1 and 3

Question : 2

From which one among the following water sources, the water is likely to be contaminated with fluoride?

a) Pond water

b) River water

c) Ground water

d) Rain water

Question : 3

Which of the following statements is correct?

a) Ozone hole is a hole formed in the troposphere from which ozone oozes out.

b) Ozone hole is thinning of ozone layer of stratosphere at some places.

c) Ozone hole is a hole formed in stratosphere from which ozone oozes out.

d) Ozone hole means vanishing of ozone layer around the earth completely.

Question : 4

Phosphate pollution is caused by

a) weathering of phosphate rocks only

b) agriculutral fertilizers only

c) sewage and agricultural fertilizers

d) phosphate rocks and sewage

Question : 5

Biochemical Oxygen Demand, (BOD) is a measure of organic material present in water. BOD value less than 5 ppm indicates a water sample to be __________.

a) poor in dissolved oxygen

b) highly polluted

c) rich in dissolved oxygen

d) not suitable for aquatic life

Question : 6

Acid rains is caused due to emission of which of the following into the atmosphere?

a) Carbon dioxide and carbon monoxide

b) Oxides of nitrogen and sulphur

c) Ozone and carbon dioxide

d) Carbon monoxide and nitrogen