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- Question
Higher concentration of CO2 in atmosphere
Options- A. allows visible solar radiation (ultraviolet) of short wave-length to pass through.
- B. reflects and absorbs the longer wavelength (infra-red) radiations.
- C. prevents solar heat being radiated out completely, resulting in 'heat trap' i.e., global warming.
- D. all (a), (b) and (c).
- Correct Answer
- all (a), (b) and (c).
- 1. High noise level in a chemical plant can be controlled by the
Options- A. suppression of noise at the source itself.
- B. path control of noise.
- C. protection of operating personnel.
- D. all (a), (b) & (c). Discuss
- 2. The major reason of hydrodynamic noise (i.e., noise resulting from liquid flow) is
Options- A. pipe vibrations.
- B. cavitation.
- C. boundary layer separation.
- D. fluctuation in liquid flow. Discuss
- 3. Radioactive substances present in the polluted water stream can be removed by
Options- A. biological oxygen treatment.
- B. coagulation and filtration.
- C. adsorption in ion exchange materials.
- D. none of these. Discuss
- 4. Green house effect is accentuated by
Options- A. deforestation.
- B. rapid industrialisation.
- C. increased transportation activity.
- D. all (a), (b) and (c). Discuss
- 5. Thermal pollution due to excessive heat & temperature in the working place causes
Options- A. reduction in working efficiency of manpower.
- B. fatigue.
- C. high breathing rate.
- D. all (a), (b) & (c). Discuss
- 6. 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
- 7. 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
- 8. 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
- 9. TLV of aldrin in public water supply system is about __________ ?g/litre.
Options- A. 0.5
- B. 17
- C. 357
- D. 1097 Discuss
- 10. 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
Environmental Engineering problems
Search Results
Correct Answer: all (a), (b) & (c).
Correct Answer: cavitation.
Correct Answer: adsorption in ion exchange materials.
Correct Answer: all (a), (b) and (c).
Correct Answer: all (a), (b) & (c).
Correct Answer: peroxy acetyl nitrate (PAN) or methyl nitrile.
Correct Answer: aerobic
Correct Answer: 'Green house' is colder than the outside atmosphere.
Correct Answer: 17
Correct Answer: 75
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