Discussion
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- Question
The average thickness of ozone layer in stratosphere is about __________ dobson unit (DU).
Options- A. 20
- B. 230
- C. 750
- D. 1500
- Correct Answer
- 230
- 1. 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
- 2. 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
- 3. 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
- 4. Reinglemann chart is used for the measurement of the
Options- A. combustibles present in automobile exhaust.
- B. smoke density from a chimey.
- C. exhaust gas density.
- D. flue gas temperature. Discuss
- 5. Out of the following, TLV of __________ is the minimum (about 0.02 ppm).
Options- A. phosgene
- B. bromine
- C. MIC (methyl iso-cynate)
- D. ozone Discuss
- 6. Disinfection of water is done to remove
Options- A. color
- B. bad taste
- C. foul odour
- D. bacteria Discuss
- 7. 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 Discuss
- 8. 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
- 9. Fluorosis is caused due to the presence of excessive amount of __________ in drinking water.
Options- A. mercury
- B. lead
- C. fluoride
- D. arsenic Discuss
- 10. 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
Environmental Engineering problems
Search Results
Correct Answer: None of these.
Correct Answer: troposphere
Correct Answer: Troposphere
Correct Answer: smoke density from a chimey.
Correct Answer: MIC (methyl iso-cynate)
Correct Answer: bacteria
Correct Answer: 0.2
Correct Answer: all (a), (b) & (c)
Correct Answer: fluoride
Correct Answer: 3 to 6
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