ENVIRONMENTAL POLLUTION & CONTROL MCQS 25

ENVIRONMENTAL POLLUTION & CONTROL  MCQS 25

1. Most of the atmospheric air pollutants are present in large quantity in
(A) Stratosphere
(B) Thermosphere
(C) Troposphere
(D) Mesosphere
Answer: Option C

2. Green house effect is accentuated by
(A) Deforestation
(B) Rapid industrialisation
(C) Increased transportation activity
(D) All (A), (B) and (C)
Answer: Option D

3. Sound produced by an automobile horn heard at a distance of 1.5 metres corresponds to about __________ decibels.
(A) 90
(B) 120
(C) 150
(D) 180
Answer: Option B

4. Operating principle of cyclone separator is based on the action of __________ dust particles.
(A) Diffusion of
(B) Centrifugal force on
(C) Gravitational force on
(D) Electrostatic force on
Answer: Option B

5. Death may occur, when SO2 concentration in atmospheric air exceeds __________ ppm.
(A) 20
(B) 100
(C) 400
(D) 200
Answer: Option C

6. Peroxyacetyl nitrate (PAN), a pollutant is found in the
(A) Automobile exhaust
(B) Flue gas of coal based power plant
(C) Exhaust of nitric acid plant
(D) Exhaust of sulphuric acid plant
Answer: Option A

7. Fluorosis (a bone disease) is caused by the presence of high concentration of __________ in atmospheric air.
(A) Hydrocarbons
(B) Hydrogen fluoride
(C) Hydrogen sulphides 
(D) Nitrogen dioxide
Answer: Option B

8. Lagooning process is mainly a means of the
(A) Sludge disposal
(B) Reduction of excessive flow in sewers
(C) Biological treatment of wastes
(D) None of these
Answer: Option A

9. __________ cannot control the noise pollution.
(A) Use of silencers
(B) Green house gases
(C) Vibration damping
(D) Tree plantation
Answer: Option B

10. Siderosis is a disease caused by the inhalation of __________ dust.
(A) Coal
(B) Silica
(C) Iron
(D) None of these
Answer: Option C