ENVIRONMENTAL POLLUTION & CONTROL MCQS 15
1. In large thermal power stations very fine particulates present in flue gas are removed by
(A) Wet scrubber
(B) Bag filter
(C) Electrostatic precipitators
(D) Dust catcher
Answer: Option C
2. Sooty and sulphurous smog formed due to combustion of fossil fuels particularly in winter, continues throughout the day and night. When the moist atmospheric air's water vapor condenses on the solid particles of smoke thereby forming smog (smoke + fog), it causes
(A) Poor visibility due to sky darkening
(B) Irritation in eyes
(C) Respiratory trouble
(D) All (A), (B) and (C)
Answer: Option D
3. Which of the following is the most lethal water pollutant?
(A) Phenol and cyanide
(B) Chlorine
(C) Alkalis
(D) Suspended solids
Answer: Option A
4. Hazardous/polluting chemical industries should have an 'exclusion zone' with a green belt and general public access prohibited around it, covering a radius of __________ metres.
(A) 100
(B) 1000
(C) 400
(D) 4000
Answer: Option B
5. The detrimental effect on organism and water quality with temperature rise of aquatic system is the reduction of __________ of water.
(A) Dissolved oxygen content
(B) Biological oxygen demand
(C) Vapor pressure
(D) All (A), (B) and (C)
Answer: Option A
6. The most commonly used chemical coagulant in water treatment is
(A) Ferrous sulphate
(B) Alum
(C) Lime
(D) Hydrazine
Answer: Option B
7. Which of the following industries discharge mercury as a pollutant?
(A) Chloro-alkali industry
(B) Tanneries
(C) Beverage plant
(D) Phosphoric acid plant
Answer: Option A
(A) Wet scrubber
(B) Bag filter
(C) Electrostatic precipitators
(D) Dust catcher
Answer: Option C
2. Sooty and sulphurous smog formed due to combustion of fossil fuels particularly in winter, continues throughout the day and night. When the moist atmospheric air's water vapor condenses on the solid particles of smoke thereby forming smog (smoke + fog), it causes
(A) Poor visibility due to sky darkening
(B) Irritation in eyes
(C) Respiratory trouble
(D) All (A), (B) and (C)
Answer: Option D
3. Which of the following is the most lethal water pollutant?
(A) Phenol and cyanide
(B) Chlorine
(C) Alkalis
(D) Suspended solids
Answer: Option A
4. Hazardous/polluting chemical industries should have an 'exclusion zone' with a green belt and general public access prohibited around it, covering a radius of __________ metres.
(A) 100
(B) 1000
(C) 400
(D) 4000
Answer: Option B
5. The detrimental effect on organism and water quality with temperature rise of aquatic system is the reduction of __________ of water.
(A) Dissolved oxygen content
(B) Biological oxygen demand
(C) Vapor pressure
(D) All (A), (B) and (C)
Answer: Option A
6. The most commonly used chemical coagulant in water treatment is
(A) Ferrous sulphate
(B) Alum
(C) Lime
(D) Hydrazine
Answer: Option B
7. Which of the following industries discharge mercury as a pollutant?
(A) Chloro-alkali industry
(B) Tanneries
(C) Beverage plant
(D) Phosphoric acid plant
Answer: Option A
8.
Which of the following is the most efficient for removal of very finely
divided suspended solids and colloidal matter from the polluted water
stream?
(A) Sedimentation tank
(B) Circular clarifier
(C) Mechanical flocculation
(D) Chemical coagulation
Answer: Option D
9. The Killer gas which caused Bhopal gas tragedy in 1984 was(A) Sedimentation tank
(B) Circular clarifier
(C) Mechanical flocculation
(D) Chemical coagulation
Answer: Option D
(A) Phosgene
(B) Methyl isocyanate (MIC)
(C) Carbon monoxide
(D) Sulphur dioxide
Answer: Option B
10. TLV of ammonia, nitrogen dioxide and phenol vapor in air is __________ ppm.
(A) 5
(B) 100
(C) 1000
(D) 2000
Answer: Option A
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