Discussion
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- Question
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
- Correct Answer
- <1
- 1. 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
- 2. Infective bacteria in water is killed by the __________ process.
Options- A. sterilisation
- B. aeration
- C. disinfection
- D. none of these Discuss
- 3. Presence of nitrogen and phosphorous in waste water discharged into lakes and ponds causes
Options- A. foaming
- B. odour nuisances
- C. undesirable plant growth
- D. turbidity Discuss
- 4. The principal gas evolved from sludge digestion tank is
Options- A. CO
- B. CO2
- C. CH4
- D. N2 Discuss
- 5. The destruction of water-borne pathogens is termed as disinfection of water. Which of the following is a water disinfectant?
Options- A. Chlorine
- B. Alkalis
- C. Benzene hexachloride
- D. Alkyl benzene sulphonate (ABS) Discuss
- 6. 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
- 7. Maximum permissible limit of mercury in human blood is __________ micrograms/100 c.c.
Options- A. 1
- B. 7
- C. 19
- D. 82 Discuss
- 8. 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
- 9. 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
- 10. Salt content in sea water is about __________ percent.
Options- A. 0.5
- B. 1
- C. 3.5
- D. 10 Discuss
Environmental Engineering problems
Search Results
Correct Answer: CO
Correct Answer: sterilisation
Correct Answer: undesirable plant growth
Correct Answer: CH4
Correct Answer: Chlorine
Correct Answer: industrial effluents
Correct Answer: 7
Correct Answer: Alum (aluminium sulphate)
Correct Answer: all (a), (b) & (c).
Correct Answer: 3.5
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