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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