Environmental Engineering Process MCQ and Answers - Set 09 - ObjectiveBooks

Environmental Engineering Process MCQ and Answers - Set 09

Practice Test: Question Set - 09

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

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

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

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

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

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)

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)

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

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)

10. During sewage treatment, the sewage is subjected to __________ treatment in Imhoff tank.
    (A) Filtration
    (B) Digestion
    (C) Sedimentation
    (D) Both (b) and (c)

11. Fine grit present in sewage is removed in the __________ during sewage treatment.
    (A) Grit chamber
    (B) Detritus tank
    (C) Trickling filter
    (D) Skimming tank

12. Which of the following pollutants is absent in the emissions from a fertilizer plant?
    (A) SO2 & SO3
    (B) NO2
    (C) NH3
    (D) CO

13. Out of the following, TLV of __________ is maximum (about 500 ppm).
    (A) Carbon dioxide
    (B) Toluene
    (C) Carbon disulphide
    (D) Acetaldehyde

14. The biological decomposition of organic substances in wastes controlled conditions is called
    (A) Incineration
    (B) Biological oxidation
    (C) Composting
    (D) None of these

15. Threshold limit value (TLV) means maximum permissible/acceptable concentration. TLV of phosgene in air is about __________ ppm (parts per million).
    (A) 0.002
    (B) 0.2
    (C) 1.2
    (D) 4.8

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