Environmental Engineering problems
- 1. Which of the following is the most efficient for removal of very finely divided suspended solids and colloidal matter from the polluted water stream?
Options- A. Sedimentation tank
- B. Circular clarifier
- C. Mechanical flocculation
- D. Chemical coagulation Discuss
Correct Answer: Chemical coagulation
- 2. White smoke coming out of the chimney of a furnace indicates the use of
Options- A. low excess air.
- B. very high excess air.
- C. gaseous fuel in the furnace.
- D. liquid fuel in the furnace. Discuss
Correct Answer: very high excess air.
- 3. A man exposed to excessive noise level in the working environment may suffer from
Options- A. hearing loss
- B. rupture of ear drum
- C. nervousness & fatigue
- D. all (a), (b) & (c) Discuss
Correct Answer: all (a), (b) & (c)
- 4. Green house gases blanket/block the infrared radiation from earth's surface to the atmosphere leading to its progressive warming up. Which of the following gases does not exhibit green house effect?
Options- A. CO2
- B. H2
- C. SO3
- D. N2 Discuss
Correct Answer: SO3
- 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
Correct Answer: Nitric acid plant
- 6. 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
Correct Answer: Electrostatic precipitator
- 7. '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
Correct Answer: automobiles exhaust.
- 8. Inhalation of silica dust by human being causes
Options- A. asphyxiation
- B. shortness of breath
- C. tuberculosis
- D. both(b) & (c) Discuss
Correct Answer: both(b) & (c)
- 9. 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
Correct Answer: a combination of smoke and fog.
- 10. 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 Discuss
Correct Answer: ozone
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