environmental chemistry - Category wise Question and Answer Practice Test with Solutions

Question : 26 [NDA]

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 : 27

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 : 28

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 : 29 [IAS Prelim]

The chemical used as a ‘fixer’ in photography is

a) Ammonium persulphate

b) Sodium thiosulphate

c) Sodium sulphate

d) Borax

Question : 30

Which one of the following chemicals is used in beauty parlours for hair-setting? [NDA]

a) Silicon based

b) Phosphorus based

c) Sulphur based

d) Iron based