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- Question
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
- Correct Answer
- mud balls
- 1. 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
- 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
- 3. 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
- 4. Which of the following is not a practical method of low level radioactive waste disposal?
Options- A. Dilution with inert material.
- B. Discharging to atmosphere through tall stacks after dilution.
- C. Disposing off in rivers & oceans.
- D. Filling in steel crates and shooting it off out of earth's gravity. Discuss
- 5. Which of the following sources is responsible for maximum air pollution?
Options- A. Industrial chimney exhaust.
- B. Forest fire.
- C. Automobiles exhaust.
- D. Photochemical oxidation of organic matter. Discuss
- 6. Out of the following, TLV of __________ is maximum (about 500 ppm).
Options- A. carbon dioxide
- B. toluene
- C. carbon disulphide
- D. acetaldehyde Discuss
- 7. Reingleman chart is used for the evaluation of __________ pollution.
Options- A. air
- B. water
- C. noise
- D. radioactive Discuss
- 8. 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
- 9. Carcinogenic air pollutants cause
Options- A. bone decay
- B. cancer
- C. asphyxiation (suffocation)
- D. anemia Discuss
- 10. 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
Environmental Engineering problems
Search Results
Correct Answer: 105
Correct Answer: low amount of excess combustion air
Correct Answer: 700 ppm
Correct Answer: Filling in steel crates and shooting it off out of earth's gravity.
Correct Answer: Automobiles exhaust.
Correct Answer: carbon dioxide
Correct Answer: air
Correct Answer: green house
Correct Answer: cancer
Correct Answer: CO
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