Environmental Engineering problems
- 1. Beyond what concentration of H2S in air, acute danger to human life exists?
Options- A. 50 ppm
- B. 100 ppm
- C. 300 ppm
- D. 700 ppm Discuss
Correct Answer: 700 ppm
- 2. Black smoke coming out of the chimney of a furnace is an indication of the use of __________ in the furnace.
Options- A. low amount of excess combustion air
- B. large quantity of excess combustion air
- C. hydrocarbon fuel
- D. pulverised coal as fuel Discuss
Correct Answer: low amount of excess combustion air
- 3. CFC (chloro fluoro carbon) is very highly reactive in causing depletion of ozone layer in the atmosphere. Each atom of chlorine liberated from CFC is capable of decomposing __________ molecules of ozones.
Options- A. 102
- B. 105
- C. 109
- D. 1015 Discuss
Correct Answer: 105
- 4. Insufficient washing of sand grains in a rapid sand filter causes
Options- A. air binding
- B. shrinkage of filtering media
- C. mud balls
- D. expansion of filtering media Discuss
Correct Answer: mud balls
- 5. Out of the following, TLV of __________ is maximum (about 500 ppm).
Options- A. carbon dioxide
- B. toluene
- C. carbon disulphide
- D. acetaldehyde Discuss
Correct Answer: carbon dioxide
- 6. Reingleman chart is used for the evaluation of __________ pollution.
Options- A. air
- B. water
- C. noise
- D. radioactive Discuss
Correct Answer: air
- 7. A 'body' which allows the short wavelength incoming solar radiation to enter in, but does not allow long wave length outgoing infra red radiation to escape out is called the
Options- A. global warming
- B. green house
- C. atmospheric effect
- D. ionosphere Discuss
Correct Answer: green house
- 8. Carcinogenic air pollutants cause
Options- A. bone decay
- B. cancer
- C. asphyxiation (suffocation)
- D. anemia Discuss
Correct Answer: cancer
- 9. Very small amount of air pollutants are present in stratosphere also; though most of the atmospheric pollutants are present in the troposphere. Which of the following atmospheric pollutants does not cause the ozone layer depletion in atmosphere at tremendous rate?
Options- A. CO
- B. SO2
- C. NOx
- D. CFC (chloro fluoro carbons) Discuss
Correct Answer: CO
- 10. Noise level in a quiet private business office is about __________ decibels.
Options- A. 25
- B. 50
- C. 70
- D. 85 Discuss
Correct Answer: 50
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