Environmental Engineering Govt Jobs Exam Questions - Set 17 - ObjectiveBooks
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Environmental Engineering Govt Jobs Exam Questions - Set 17

Practice Test: Question Set - 17

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

2. Green house effect is accentuated by
    (A) Deforestation
    (B) Rapid industrialization
    (C) Increased transportation activity
    (D) All (a), (b) and (c)

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

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

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

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

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

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

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

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

11. Which of the following is the most major constituents of air pollutants?
    (A) Oxides of sulphur
    (B) Oxides of nitrogen
    (C) Carbon monoxide
    (D) Hydrogen sulphide

12. Noise level heard inside a bus in busy city traffic or inside a sub-way train corresponds to about __________ decibels.
    (A) 75
    (B) 95
    (C) 120
    (D) 140

13. Tri-sodium phosphate is used in boiler water treatment to reduce
    (A) Turbidity
    (B) Caustic embrittlement
    (C) Suspended silica
    (D) Dissolved oxygen

14. A gas is termed as non-toxic, if its maximum permissible concentration (TLV) ranges from __________ ppm.
    (A) 1000 to 2000
    (B) 3000 to 6000
    (C) 6000 to 9000
    (D) 10000 to 100000

15. Moist atmospheric air at high temperature (e.g., in summer) having high concentration of sulphur dioxide causes
    (A) Fading of dyes on textiles
    (B) Corrosion, tarnishing & soiling of metals
    (C) Reduced strength of textiles
    (D) All (a), (b) and (c)

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