Discussion
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- Question
Which of the following processes is involved in the biochemical treatment of sewage effluents?
Options- A. Oxidation
- B. Reduction
- C. Dehydration
- D. Fermentation
- Correct Answer
- Oxidation
- 1. What is the major constituents of waste/polluted water discharged from textile, pulp & paper, tanning, distillary, dairy and meat packing industries?
Options- A. Radioactive substances
- B. Natural organic products
- C. Inorganic pollutants
- D. None of these Discuss
- 2. In large thermal power stations very fine particulates present in flue gas are removed by
Options- A. wet scrubber
- B. bag filter
- C. electrostatic precipitators
- D. dust catcher Discuss
- 3. The pH value of oxidised sewage is about
Options- A. 1.8
- B. 6.2
- C. 7.3
- D. 13.4 Discuss
- 4. Salt content in sea water is about __________ percent.
Options- A. 0.5
- B. 1
- C. 3.5
- D. 10 Discuss
- 5. Lagoons used for purification of polluted water
Options- A. are large shallow artificial lakes also known as clarification lakes, maturation ponds or oxidation ponds.
- B. use micro-organisms/bacteria in presence of dissolved oxygen.
- C. gives an excellent final effluent (with 3 to 4 lagoons arranged in series) having suspended solid < 1 mg/litre and BOD = 3.8 mg/litre.
- D. all (a), (b) & (c). Discuss
- 6. 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
- 7. Polyvinyl chloride containers are not suitable for storing
Options- A. foodstuffs
- B. woolen clothes
- C. metallic powder
- D. none of these Discuss
- 8. 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
- 9. Threshold limit value (TLV) of CO in air is __________ ppm.
Options- A. 5
- B. 50
- C. 2000
- D. 5000 Discuss
- 10. 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
Environmental Engineering problems
Search Results
Correct Answer: Natural organic products
Correct Answer: electrostatic precipitators
Correct Answer: 7.3
Correct Answer: 3.5
Correct Answer: all (a), (b) & (c).
Correct Answer: Electrostatic precipitator
Correct Answer: foodstuffs
Correct Answer: 1000
Correct Answer: 50
Correct Answer: Silica gel
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