ENVIRONMENTAL POLLUTION & CONTROL MCQS 13

ENVIRONMENTAL POLLUTION & CONTROL  MCQS 13

1. Which of the following plants does not emit appreciable amount of SO2 in atmosphere?
(A) Thermal power plant
(B) Petroleum refinery
(C) Nitric acid plant
(D) Sulphuric acid plant
Answer: Option C
2. In sewage treatment, the detention period allowed for oxidation ponds ranges from __________ weeks.
(A) 1 to 2
(B) 4 to 5
(C) 9 to 10
(D) 15 to 20
Answer: Option B
3. The pH value of potable water should be between
(A) 1 to 1.5
(B) 6.5 to 8
(C) 13 to 14
(D) 4 to 5
Answer: Option B
4. Insufficient washing of sand grains in a rapid sand filter causes
(A) Air binding
(B) Shrinkage of filtering media
(C) Mud balls
(D) Expansion of filtering media
Answer: Option C
5. Which of the following causes death by asphyxiation, if its presence in atmospheric air exceeds maximum allowable concentration (i.e. > 50 ppm)?
(A) Benzopyrene
(B) Peroxyacetyl nitrate
(C) Carbon monoxide
(D) Sulphur dioxide
Answer: Option C
6. Lead exhausted in the atmosphere by automobiles using leaded petrol (i.e. tetraethyl lead for improving octane number) is a lethal air pollutant which causes
(A) Paralysis of muscles & loss of appetite
(B) Nervous depression
(C) Gastritis and diarrhea
(D) All (A), (B) and (C)
Answer: Option D
7. Sulphur dioxide present in the industrial chimney exhaust gases causes
(A) Respiratory & lung disease
(B) Reduction in plant's productivity owing to acid rain
(C) Corrosion of building materials
(D) All (A), (B) and (C)
Answer: Option D
8. Phenolic water generated in coke ovens & by-product plant of a steel plant are disposed off by
(A) Quenching of hot coke
(B) Discharging in the river stream
(C) Filtration and recycling for cooling coke oven gas
(D) None of these
Answer: Option A
9. Corrosion in boilers can be prevented by
(A) Deaeration of feed water
(B) Enhancing pH of feed water by adding alkali
(C) Feeding sodium sulphite or hydrazine phosphate to the boilers, which combines with oxygen and prevents corrosion
(D) All (A), (B) and (C)
Answer: Option D
10. During sewage treatment, the sewage is subjected to __________ treatment in Imhoff tank.
(A) Filtration
 (B) Digestion
(C) Sedimentation
(D) Both (B) and (C)
Answer: Option D