set 3 MCQ Questions & Answers Detailed Explanation

Question : 1

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 : 2

The statement which is not correct about control of particulate pollution:

a) Gravity settling chamber removes larger particles from the air

b) In electrostatic precipitator, the particulates are made to acquire positive charge which are then attracted by the negative electrode and removed

c) Cyclone collector removes fine particles in the diameter range 5-20 microns

d) Wet scrubbers are used to wash away all types of particulates

Question : 3

Which of the following is not a consequence of greenhouse effect?

a) Plants in warmer climates with adequate rainfall would grow faster

b) The incidence of infectious diseases is likely to increase

c) Climatic conditions will be changed

d) Malaria will be controlled as the mosquitoes will not survive.

Question : 4

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 : 5

Which one of the following substances is used in the manufacture of safety matches?

a) Phosphorus trioxide (P203)

b) White phosphorus

c) Red phosphorus

d) Black phosphorus

Question : 6

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