set 1 MCQ Questions & Answers Detailed Explanation

Question : 1

CO₂ absorbs some of the ............. that radiates from the surface of Earth to space –

a) ultraviolet light

b) heat

c) ozone

d) smog

Question : 2

The layer which reflects radio signals back to earth is –

a) Ionosphere

b) Troposphere

c) Ozone layer

d) Stratosphere

Question : 3

What is the composition of nitrolim – a chemical fertilizer?

a) Calcium carbide and carbon

b) Calcium carbide and nitrogen

c) Nitrogen and limestone

d) None of the above

Question : 4

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 : 5

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

a) NO

b) SO₂

c) Hydrocarbon

d) O₃

Question : 6

The pollutants which came directly in the air from sources are called primary pollutants. Primary pollutants are sometimes converted into secondary pollutants. Which of the following belongs to secondary air pollutants?

a) Hydrocarbon

b) Peroxyacetyl nitrate

c) CO

d) NO