Environmental Engineering problems
- 1. Which of the following fine dust removal equipments is the most efficient?
Options- A. Bag filter
- B. Scrubber
- C. Electrostatic precipitator
- D. Cyclone separator Discuss
Correct Answer: Electrostatic precipitator
- 2. Polyvinyl chloride containers are not suitable for storing
Options- A. foodstuffs
- B. woolen clothes
- C. metallic powder
- D. none of these Discuss
Correct Answer: foodstuffs
- 3. 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.
Options- A. 100
- B. 1000
- C. 400
- D. 4000 Discuss
Correct Answer: 1000
- 4. Threshold limit value (TLV) of CO in air is __________ ppm.
Options- A. 5
- B. 50
- C. 2000
- D. 5000 Discuss
Correct Answer: 50
- 5. Which of the following is an adsorbant for removal of nitrogen oxides from gas/air?
Options- A. Active carbon
- B. Silica gel
- C. Bog iron (iron oxide)
- D. Pulverised limestone Discuss
Correct Answer: Silica gel
- 6. There are thirteen metals which are treated as pollutants. Which of the following metals is not a pollutant?
Options- A. Mercury
- B. Arsenic
- C. Aluminium
- D. Lead Discuss
Correct Answer: Aluminium
- 7. The main type of sludge gas evolved during sewage treatment in Imhoff tank is
Options- A. CO2
- B. CH4
- C. CO
- D. H2 Discuss
Correct Answer: CH4
- 8. Corrosion in boilers can be prevented by
Options- 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). Discuss
Correct Answer: all (a), (b) and (c).
- 9. Biological oxidation ponds remove organic matters present in the polluted water by
Options- A. using the activities of bacteria and other micro organisms.
- B. aerobic oxidation.
- C. both (a) & (b).
- D. neither (a) nor (b). Discuss
Correct Answer: both (a) & (b).
- 10. Out of the following, TLV of __________ is the minimum (about 0.02 ppm).
Options- A. phosgene
- B. bromine
- C. MIC (methyl iso-cynate)
- D. ozone Discuss
Correct Answer: MIC (methyl iso-cynate)
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