Environmental Engineering problems
- 1. Pick out the wrong statement.
Options- A. Benzopyrene which causes cancer is present in traces in tobacco, charcoal & petrol driven automobile exhaust.
- B. NO2 is capable of penetrating the troposphere and can absorb both ultraviolet & visible light.
- C. Hydrocarbon pollutants are produced by sweet gum, oak & natural rubber trees.
- D. H2S is not at all produced during combustion of sulphur bearing fuels as all the sulphur is oxidised to SO2. Discuss
Correct Answer: H2S is not at all produced during combustion of sulphur bearing fuels as all the sulphur is oxidised to SO2.
- 2. Removal of __________ is accomplished by aeration of water.
Options- A. dissolved gases
- B. suspended solids
- C. dissolved solids
- D. none of these Discuss
Correct Answer: dissolved gases
- 3. Which of the following is not an air pollutant?
Options- A. Ozone
- B. Carcinogens
- C. Pesticides
- D. Metallic powders Discuss
Correct Answer: Ozone
- 4. Carbon monoxide is a pollutant, which causes
Options- A. respiratory disease (e.g. asthma).
- B. asphyxiation (suffocation) leading to death.
- C. retardation in crop growth.
- D. damage to building materials like marble. Discuss
Correct Answer: asphyxiation (suffocation) leading to death.
- 5. In troposphere (the weather domain), the temperature 't' at height 'h' above the spa level in metres is given by (where, temperature at sea level is 15°C and t is in °C.)
Options- A. t = 15 - 0.0065h
- B. t = 15 + 0.0065h
- C. t = 0.0035h -15
- D. t = 15 - 0.0035h Discuss
Correct Answer: t = 15 - 0.0065h
- 6. __________ is removed from water by lime-soda process.
Options- A. Foul smell and taste
- B. Iron and manganese
- C. Temporary hardness
- D. Permanent hardness Discuss
Correct Answer: Temporary hardness
- 7. When the concentration of SO2 in air is greater than __________ ppm, it gives a pungent smell.
Options- A. 0.01
- B. 0.1
- C. 1
- D. 4 Discuss
Correct Answer: 4
- 8. In water treatment, alum[Al2(SO4)3] is used for the process of
Options- A. filtration
- B. coagulation
- C. sedimentation
- D. disinfection Discuss
Correct Answer: coagulation
- 9. Shouting by a man at his full voice corresponds to a voice level of about __________ decibels.
Options- A. 25
- B. 50
- C. 80
- D. 120 Discuss
Correct Answer: 80
- 10. Death may occur, when SO2 concentration in atmospheric air exceeds __________ ppm.
Options- A. 20
- B. 100
- C. 400
- D. 200 Discuss
Correct Answer: 400
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