Discussion
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- Question
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
- Correct Answer
- oil & fatty
- 1. 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
- 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
- 3. 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
- 4. Limestone powder is injected during pulverised coal burning in boilers to __________ the flue gases.
Options- A. reduce SO2 content in
- B. catalytically convert SO2 to SO3 in
- C. increase the dew point of
- D. none of these. Discuss
- 5. Solid content in most of the domestic sewage is about __________ percent.
Options- A. 0.001
- B. 0.1
- C. 5
- D. 10 Discuss
- 6. 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
- 7. 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
- 8. The principal gas evolved from sludge digestion tank is
Options- A. CO
- B. CO2
- C. CH4
- D. N2 Discuss
- 9. 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
- 10. Infective bacteria in water is killed by the __________ process.
Options- A. sterilisation
- B. aeration
- C. disinfection
- D. none of these Discuss
Environmental Engineering problems
Search Results
Correct Answer: 5
Correct Answer: chemical coagulation
Correct Answer: Chloro-alkali industry
Correct Answer: reduce SO2 content in
Correct Answer: 0.1
Correct Answer: all (a), (b) and (c).
Correct Answer: Chlorine
Correct Answer: CH4
Correct Answer: undesirable plant growth
Correct Answer: sterilisation
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