Discussion
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- Question
Noise emitted by a ventilation fan at a distance of 3 metres is about __________ decibels.
Options- A. 85
- B. 105
- C. 125
- D. 145
- Correct Answer
- 105
- 1. Maximum permissible limit of industrial noise as recommended by World Health Organisation (WHO) is __________ decibels.
Options- A. 35
- B. 75
- C. 95
- D. 105 Discuss
- 2. TLV of aldrin in public water supply system is about __________ ?g/litre.
Options- A. 0.5
- B. 17
- C. 357
- D. 1097 Discuss
- 3. Pick out the wrong statement pertaining to 'green house' for the plants.
Options- A. 'Green house' (made of glass) allows visible sunlight (i.e., short wavelength solar radiation like ultra-violet rays) to pass through the glass and heat up the soil thereby warming up plants inside it.
- B. The emitted longer wavelength radiation (e.g., infrared) is partly reflected and partly absorbed by the glass of the green house.
- C. 'Green house effect' in earth's atmosphere is due to increasing CO2 level in atmosphere. where CO2 acts like the glass of 'green house' thereby warming up the earth's surface.
- D. 'Green house' is colder than the outside atmosphere. Discuss
- 4. The type of bacteria which is active in trickling filter during biological treatment of sewage is the __________ bacteria.
Options- A. anaerobic
- B. saphrophytic
- C. aerobic
- D. parasitic Discuss
- 5. Direct reaction of unsaturated hydrocarbons with either NO or NO2 produces an eye irritating pollutant compound known as
Options- A. photochemical smog.
- B. peroxy acetyl nitrate (PAN) or methyl nitrile.
- C. benzopyrene.
- D. poly acrylonitrile Discuss
- 6. Lagooning process is mainly a means of the
Options- A. sludge disposal.
- B. reduction of excessive flow in sewers.
- C. biological treatment of wastes.
- D. none of these. Discuss
- 7. Algae growth in water is controlled by
Options- A. deoxidation
- B. chlorination
- C. bleaching
- D. aeration Discuss
- 8. Presence of dissolved impurities of __________ is responsible for the red brownish color of water.
Options- A. carbonates
- B. bi-carbonates
- C. iron & manganese
- D. arsenic Discuss
- 9. __________ substances present in sewage are removed in grit chamber during sewage treatment.
Options- A. Organic
- B. Fatty
- C. Inorganic
- D. Dissolved Discuss
- 10. Irradiation of water by ultraviolet light of suitable wavelength is commonly used for disinfection of water in
Options- A. food industry.
- B. municipal sewage treatment.
- C. petroleum refinery.
- D. iron & steel plant. Discuss
Environmental Engineering problems
Search Results
Correct Answer: 75
Correct Answer: 17
Correct Answer: 'Green house' is colder than the outside atmosphere.
Correct Answer: aerobic
Correct Answer: peroxy acetyl nitrate (PAN) or methyl nitrile.
Correct Answer: sludge disposal.
Correct Answer: chlorination
Correct Answer: iron & manganese
Correct Answer: Inorganic
Correct Answer: food industry.
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