ENVIRONMENTAL POLLUTION & CONTROL MCQS 21

ENVIRONMENTAL POLLUTION & CONTROL  MCQS 21

1. Noise produced by cooling fans (employed in air cooled heat exchangers or cooling tower) is mainly caused due to the turbulence created by blade passage through air. It can be reduced by use of a slower fan
(A) With greater number of blades
(B) Of increased diameter
(C) Both (A) & (B)
(D) Neither (A) nor (B)
Answer: Option C

2. Turbidity of water is an indication of the presence of
(A) Suspended inorganic matter
(B) Dissolved solids
(C) Floating solids
(D) Dissolved gases
Answer: Option A

3. The major reason of hydrodynamic noise (i.e., noise resulting from liquid flow) is
(A) Pipe vibrations
(B) Cavitation
(C) Boundary layer separation
(D) Fluctuation in liquid flow
Answer: Option B

4. The concentration of water vapour in troposphere, which depends upon the altitude & temperature, varies in the range of zero to __________ percent.
(A) 1
(B) 4
(C) 8
(D) 12
Answer: Option B

5. Dust collection efficiency of a cyclone separator depends upon its
(A) Diameter
(B) Inlet gas velocity
(C) Overall height
(D) All (A), (B) & (C)
Answer: Option D

6. Pick out the one which is not a chemical coagulant.
(A) Aluminium sulphate
(B) Ferrous sulphate
(C) Hydrated lime
(D) Chloramine
Answer: Option D

7. Which of the following is the most severe air pollutant?
(A) Hydrocarbons
(B) NOx
(C) SO2
(D) CO
Answer: Option B

8. Inhalation of lead compounds present in the automobile exhausts (using leaded petrol) causes
(A) Blood poisoning
(B) Anaemia
(C) Nervous system disorder
(D) All (A), (B) and (C)
Answer: Option D

9. In troposphere (the weather domain), the temperature 't' at height 'h' above the spa level in metres is given by (where, temperature at sea level is 15°C and t is in °C.)
(A) t = 15 - 0.0065h
(B) t = 15 + 0.0065h
(C) t = 0.0035h -15
(D) t = 15 - 0.0035h
Answer: Option A

10. Pick out the wrong statement.
(A) Catalytic converter is fitted in automobiles to reduce carbon monoxide concentration in exhaust emissions
(B) Inhalation of pollutant carbon monoxide results in death by asphyxiation
(C) Sulphur dioxide is the main pollutant emitted from the exhaust of petrol driven automobiles
(D) Decomposition of plants containing chlorophyll is a natural source of carbon monoxide in atmosphere
Answer: Option C