Discussion
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- Question
A considerable part of the harmful ultraviolet radiation of the sum does not reach the earth surface, because of the fact that, there is a layer of __________ high above earth's atmosphere, which absorbs it.
Options- A. hydrogen
- B. carbon dioxide
- C. ozone
- D. none of these
- Correct Answer
- ozone
- 1. Smog is
Options- A. nothing but black smoke.
- B. a combination of smoke and fog.
- C. a liquid particle resulting from vapor condensation.
- D. a solid particle e.g. flyash. Discuss
- 2. Inhalation of silica dust by human being causes
Options- A. asphyxiation
- B. shortness of breath
- C. tuberculosis
- D. both(b) & (c) Discuss
- 3. 'Safe limit' called Threshold Limit Value (TLV) of carbon monoxide in atmospheric air is < 50 ppm. The main source of carbon monoxide pollutant in air is the
Options- A. industrial chimney exhaust.
- B. automobiles exhaust.
- C. photochemical reaction in polluted atmosphere.
- D. burning of domestic fuel. Discuss
- 4. Which is the most efficient dust removal equipment for removal of sub-micronic dust particles from blast furnace gas?
Options- A. Packed scrubber
- B. Gravity settling chamber
- C. Electrostatic precipitator
- D. Hydrocyclone Discuss
- 5. Which of the following plants does not emit appreciable amount of SO2 in atmosphere?
Options- A. Thermal power plant
- B. Petroleum refinery
- C. Nitric acid plant
- D. Sulphuric acid plant Discuss
- 6. Average human body contains about __________ percent water by weight.
Options- A. 20
- B. 40
- C. 70
- D. 85 Discuss
- 7. Growth of __________ is promoted by the presence of manganese in water.
Options- A. files
- B. algae
- C. micro-organisms
- D. mosquitoes Discuss
- 8. Noise level audible to audience sitting in the 5th row from the stage during a large orchestra show corresponds to about __________ decibels.
Options- A. 105
- B. 135
- C. 160
- D. 185 Discuss
- 9. Presence of non-biodegradable substances, like alkyl benzene sulphonate (ABS) from the detergents in polluted water stream causes
Options- A. fire hazards.
- B. explosion hazards.
- C. persistent foam.
- D. depletion of dissolved oxygen. Discuss
- 10. If carbon monoxide content in atmospheric air exceeds __________ ppm, death is bound to occur.
Options- A. 50
- B. 500
- C. 1000
- D. 3000 (i.e. 0.3%) Discuss
Environmental Engineering problems
Search Results
Correct Answer: a combination of smoke and fog.
Correct Answer: both(b) & (c)
Correct Answer: automobiles exhaust.
Correct Answer: Electrostatic precipitator
Correct Answer: Nitric acid plant
Correct Answer: 70
Correct Answer: micro-organisms
Correct Answer: 135
Correct Answer: persistent foam.
Correct Answer: 3000 (i.e. 0.3%)
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