set 2 MCQ Questions & Answers Detailed Explanation

Question : 1

The greenhouse effect is because of the

a) presence of CO₂ only in the atmosphere

b) pressure of O₃ and CH₄ in the atmosphere

c) presence of gases, which in general are strong infrared absorbers, in the atmosphere

d) N₂O and chlorofluorohydrocarbons in the atmosphere

Question : 2

Eutrophication causes reduction in

a) nutrients

b) dissolved oxygen

c) dissolved salts

d) All the above

Question : 3

Statement I :
Coal-based thermal power stations contribute to acid-rain.
Statement II :
Oxides of carbon are emitted when coal burns.

a) Statement I is true but Statement II is false

b) Both Statement I and Statement II are individually true but Statement II is not the correct explanation of Statement I

c) Both Statement I and Statement II are individually true and Statement II is the correct explanation of Statement I

d) Statement I is false but Statement II is true

Question : 4

Which one of the following is another name of RDX?

a) Cyclohexane

b) Dextran

c) Cyanohydrin

d) Cyclonite

Question : 5

Which of the following chemicals is used in foam fire extinguishers? [NDA]

a) Cobalt sulphate

b) Copper sulphate

c) Aluminium sulphate

d) Nickel sulphate

Question : 6

Which of the following is not a synthetic fibre:

a) Nylon

b) Rayon

c) Angora

d) Polyester