Discussion
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- Question
Threshold limit value (TLV) means maximum permissible/acceptable concentration. TLV of phosgene in air is about __________ ppm (parts per million).
Options- A. 0.002
- B. 0.2
- C. 1.2
- D. 4.8
- Correct Answer
- 0.2
- 1. Disinfection of water is done to remove
Options- A. color
- B. bad taste
- C. foul odour
- D. bacteria Discuss
- 2. The average thickness of ozone layer in stratosphere is about __________ dobson unit (DU).
Options- A. 20
- B. 230
- C. 750
- D. 1500 Discuss
- 3. Which of the following is not a natural source of air pollution?
Options- A. Volcanic eruptions and lightening discharges.
- B. Biological decay of vegetable matter.
- C. Photochemical oxidation of organic matter.
- D. None of these. Discuss
- 4. The density of the gases (present in air) decreases with increasing altitude to such an extent, that about 70% of the mass of atmospheric air is found in the lower 5 km. of the atmosphere. This lower region of atmosphere is called the
Options- A. ionosphere
- B. troposphere
- C. stratosphere
- D. none of these Discuss
- 5. Which of the following is the most active zone of atmosphere in which weathering events like rain, storm & lightning occur?
Options- A. Thermosphere
- B. Troposphere
- C. Stratosphere
- D. none of these Discuss
- 6. Photochemical smog is formed from automobile exhaust
Options- A. by reaction of hydrocarbon & nitric oxide in presence of sunlight.
- B. appears only on sunny days.
- C. is harmful for crops and trees also besides causing eye irritation & asthma.
- D. all (a), (b) & (c) Discuss
- 7. Fluorosis is caused due to the presence of excessive amount of __________ in drinking water.
Options- A. mercury
- B. lead
- C. fluoride
- D. arsenic Discuss
- 8. Water filtration rate in a rapid sand filter ranges from __________ kilolitres/m2/hr.
Options- A. 0.1 to 1
- B. 3 to 6
- C. 10 to 15
- D. 15 to 20 Discuss
- 9. Pick out the wrong statement.
Options- A. Biological oxygen demand (BOD) is a characteristic and not a constituent of water.
- B. BOD is a measure of the amount of oxygen which will be demanded & used in 5 days by the biological decomposition of the organic matter present in water stream present as food for the living organism.
- C. BOD is expressed in mg/litre (typically, BOD=2.5 mg/litre for potable water).
- D. none of these Discuss
- 10. The weakest sound that can be heard by a person in a quiet environment is equivalent to __________ decibel.
Options- A. 1
- B. 5
- C. 10
- D. 20 Discuss
Environmental Engineering problems
Search Results
Correct Answer: bacteria
Correct Answer: 230
Correct Answer: None of these.
Correct Answer: troposphere
Correct Answer: Troposphere
Correct Answer: all (a), (b) & (c)
Correct Answer: fluoride
Correct Answer: 3 to 6
Correct Answer: none of these
Correct Answer: 1
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