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- Question
There are five concentric layers within the atmosphere which is differentiated on the basis of temperature. The atmospheric layer which lies close to the earth's surface in which human being along with other organisms live is called troposphere. The rate at which air temperature in the troposphere gradually decreases with height is about __________ °C/km.
Options- A. 0.05
- B. 1
- C. 6.5
- D. 15
- Correct Answer
- 6.5
- 1. Removal of __________ results from the disinfection of water.
Options- A. turbidity
- B. odour
- C. hardness
- D. bacteria Discuss
- 2. Brown spots in fabrics will be caused by washing with water containing large amount of .
Options- A. iron
- B. zinc
- C. iodine
- D. bromine Discuss
- 3. Pick out the wrong statement.
Options- A. A slight haze at the top of chimney indicates good combustion in the furnace.
- B. A bag filter incurs very small pressure drop and is very efficient for removal of sub-micronic dust particles from flue gases at very high temperature.
- C. Electrostatic precipitator is the most efficient dust collection equipment for removal of sub-micronic dust particles present in flue gas.
- D. none of these. Discuss
- 4. The maximum CO2 is emitted into the atmosphere by
Options- A. combustion
- B. urea
- C. biomass burning
- D. trees Discuss
- 5. Maximum permissible concentration (i.e. TLV) of DDT in public water supply system is __________ micro gram (? g)/litre.
Options- A. 2
- B. 42
- C. 332
- D. 1050 Discuss
- 6. Fresh domestic sewage is __________ in color.
Options- A. grey
- B. dark brown
- C. red
- D. black Discuss
- 7. Which of the following is a secondary air pollutant?
Options- A. Photochemical smog
- B. Sulphur dioxide
- C. Nitrogen dioxide
- D. Dust particles Discuss
- 8. Sooty and sulphurous smog formed due to combustion of fossil fuels particularly in winter, continues throughout the day and night. When the moist atmospheric air's water vapor condenses on the solid particles of smoke thereby forming smog (smoke + fog), it causes
Options- A. poor visibility due to sky darkening.
- B. irritation in eyes.
- C. respiratory trouble.
- D. all (a), (b) and (c). Discuss
- 9. In sewage treatment, its sedimentation is speeded up by commonly adding
Options- A. hydrochloric acid.
- B. lime.
- C. copper sulphate.
- D. sodium sulphate. Discuss
- 10. Presence of __________ bacteria in water causes disease like typhoid.
Options- A. aerobic
- B. pathogenic
- C. anaerobic
- D. non-pathogenic Discuss
Environmental Engineering problems
Search Results
Correct Answer: bacteria
Correct Answer: iron
Correct Answer: A bag filter incurs very small pressure drop and is very efficient for removal of sub-micronic dust particles from flue gases at very high temperature.
Correct Answer: combustion
Correct Answer: 42
Correct Answer: grey
Correct Answer: Photochemical smog
Correct Answer: all (a), (b) and (c).
Correct Answer: lime.
Correct Answer: pathogenic
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