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- Question
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).
- Correct Answer
- all (a), (b) & (c).
- 1. Which is the most widely used coagulant for the treatment of turbid water?
Options- A. Alum (aluminium sulphate)
- B. Lime
- C. Ferric chloride
- D. Sodium aluminate Discuss
- 2. Maximum permissible limit of mercury in human blood is __________ micrograms/100 c.c.
Options- A. 1
- B. 7
- C. 19
- D. 82 Discuss
- 3. The term Biological Oxygen Demand (BOD) is used in relation to
Options- A. potable water
- B. cooling water
- C. distilled water
- D. industrial effluents Discuss
- 4. Threshold limit value (TLV) i.e., the maximum permissible safe limit of phosgene gas which Hitler used to use to kill his enemies in 'gas chamber' is about __________ ppm.
Options- A. <1
- B. 10-100
- C. 100-200
- D. 100-1000 Discuss
- 5. Which of the following pollutants is absent in the emissions from a fertiliser plant?
Options- A. SO2 & SO3
- B. NO2
- C. NH3
- D. CO Discuss
- 6. Salt content in sea water is about __________ percent.
Options- A. 0.5
- B. 1
- C. 3.5
- D. 10 Discuss
- 7. The pH value of oxidised sewage is about
Options- A. 1.8
- B. 6.2
- C. 7.3
- D. 13.4 Discuss
- 8. 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
- 9. 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
- 10. Which of the following processes is involved in the biochemical treatment of sewage effluents?
Options- A. Oxidation
- B. Reduction
- C. Dehydration
- D. Fermentation Discuss
Environmental Engineering problems
Search Results
Correct Answer: Alum (aluminium sulphate)
Correct Answer: 7
Correct Answer: industrial effluents
Correct Answer: <1
Correct Answer: CO
Correct Answer: 3.5
Correct Answer: 7.3
Correct Answer: electrostatic precipitators
Correct Answer: Natural organic products
Correct Answer: Oxidation
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