set 1 MCQ Questions & Answers Detailed Explanation

Question : 1

Which of the following is not involved in the formation of photochemical smog?

a) NO

b) SO₂

c) Hydrocarbon

d) O₃

Question : 2

Identify the wrong statement in the following.

a) Greenhouse effect is responsible for global warming.

b) Ozone layer does not permit infrared radiation from the sun to reach the earth.

c) Chlorofluorocarbons are responsible for ozone layer depletion.

d) Acid rain is mostly because of oxides of nitrogen and sulphur.

Question : 3

BOD is connected with

a) organic matter

b) microbes and organic matter

c) microbes

d) None

Question : 4

When rain is accompanied by a thunderstorm, the collected rain water will have a pH value

a) slightly higher than that when the thunderstorm is not there

b) uninfluenced by occurrence of thunderstorm

c) slightly lower than that of rain water without thunderstorm

d) which depends upon the amount of dust in air

Question : 5

The greatest affinity for haemoglobin is shown by which of the following :

a) CO

b) O₂

c) NO

d) CO₂

Question : 6

Living in the atmosphere of CO is dangerous because it

a) Dries up the blood

b) Reduces organic matter of tissues

c) Combined with O₂ present inside to form CO₂

d) Combines with haemoglobin and makes it incapable of absorbing oxygen