set 3 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) (i) and (ii)

b) (ii) and (iv)

c) (ii) and (iii)

d) (i) and (iii)

Question : 2

What is a mixture of potassium nitrate, powdered charcoal and sulphur called ?

a) Paint

b) Cement

c) Glass

d) Gun power

Question : 3

What is the purpose of adding plasticizers in paint manufacturing process?

a) They prevent the polymerization and condensation

b) They reduce the viscosity

c) They act as a film-forming constituent

d) They provide elasticity to the film and minimize its cracking

Question : 4

Which of the following is the major cause of global warming?

a) re-radiation of I.R. rays by O₂ and N₂

b) re-radiation of I.R. rays by CO₂ and H₂O

c) re-radiation of U.V. rays by CO₂ and H₂O

d) re-radiation of U.V. rays by O₂ and N₂

Question : 5

Which of the following substances is/are ozone depleting?

1. Chlorofluorocarbons
2. Halons
3. Carbon tetrachloride

a) 1 and 2

b) 1 only

c) 2 and 3

d) 1, 2 and 3

Question : 6

The polymeric fibre used as a substitute for wool in making synthetic blankets, sweaters, etc., is

a) orlon

b) teflon

c) nylon

d) Bakelite