Environmental Engineering Books Theory MCQ Questions - Set 14 - ObjectiveBooks
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Environmental Engineering Books Theory MCQ Questions - Set 14

Practice Test: Question Set - 14

1. During which of the following operating conditions of an automobile, carbon monoxide content in the exhaust gas is maximum?
    (A) Idle running
    (B) Acceleration
    (C) Cruising
    (D) Deceleration

2. Pick out the wrong statement.
    (A) Benzopyrene which causes cancer is present in traces in tobacco, charcoal & petrol driven automobile exhaust
    (B) NO2 is capable of penetrating the troposphere and can absorb both ultraviolet & visible light
    (C) Hydrocarbon pollutants are produced by sweet gum, oak & natural rubber trees
    (D) H2S is not at all produced during combustion of sulphur bearing fuels as all the sulphur is oxidized to SO2

3. 'Particulate' air pollutants are finely divided solids and liquids. Which of the following is not a ‘particulate’?
    (A) Dust & mists
    (B) Smoke & fumes
    (C) Photochemical smog & soot
    (D) None of these

4. Main pollutants released from iron & steel industry is
    (A) CO, CO2 & SO2
    (B) H2S, NO & SO3
    (C) CO2, H2S & NO2
    (D) SO3, NO2 & CO2

5. Presence of dissolved impurities of __________ is responsible for the red brownish color of water.
    (A) Carbonates
    (B) Bi-carbonates
    (C) Iron & manganese
    (D) Arsenic

6. 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)

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

8. 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

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

10. Dust collection efficiency of a cyclone separator depends upon its
    (A) Diameter
    (B) Inlet gas velocity
    (C) Overall height
    (D) All (a), (b) & (c)

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

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

13. 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)

14. In troposphere (the weather domain), the temperature 't' at height 'h' above the spa level in meters 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

15. 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

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