Environmental Engineering problems
- 1. Which of the following industries discharge mercury as a pollutant?
Options- A. Chloro-alkali industry
- B. Tanneries
- C. Beverage plant
- D. Phosphoric acid plant Discuss
Correct Answer: Chloro-alkali industry
- 2. Oilish impurities present the effluent discharged from the electroplating industry is normally not removed by
Options- A. chemical coagulation
- B. floatation & skimming
- C. centrifugation
- D. ultrafiltration Discuss
Correct Answer: chemical coagulation
- 3. From pollution control point of view, the maximum permissible concentration of sulphur dioxide in atmospheric air is about __________ ppm.
Options- A. 1
- B. 5
- C. 50
- D. 500 Discuss
Correct Answer: 5
- 4. The function of skimming tank in sewage treatment is to remove __________ substances.
Options- A. dissolved solid
- B. suspended solid
- C. oil & fatty
- D. gritty & inorganic Discuss
Correct Answer: oil & fatty
- 5. 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
Options- A. paralysis of muscles & loss of appetite.
- B. nervous depression.
- C. gastritis & diarrhea.
- D. all (a), (b) and (c). Discuss
Correct Answer: all (a), (b) and (c).
- 6. 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
Correct Answer: Chlorine
- 7. The principal gas evolved from sludge digestion tank is
Options- A. CO
- B. CO2
- C. CH4
- D. N2 Discuss
Correct Answer: CH4
- 8. 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
Correct Answer: undesirable plant growth
- 9. Infective bacteria in water is killed by the __________ process.
Options- A. sterilisation
- B. aeration
- C. disinfection
- D. none of these Discuss
Correct Answer: sterilisation
- 10. 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
Correct Answer: CO
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