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- Question
In water treatment, alum[Al2(SO4)3] is used for the process of
Options- A. filtration
- B. coagulation
- C. sedimentation
- D. disinfection
- Correct Answer
- coagulation
- 1. 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
- 2. __________ 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
- 3. 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
- 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
- 5. Which of the following is not an air pollutant?
Options- A. Ozone
- B. Carcinogens
- C. Pesticides
- D. Metallic powders Discuss
- 6. 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
- 7. Death may occur, when SO2 concentration in atmospheric air exceeds __________ ppm.
Options- A. 20
- B. 100
- C. 400
- D. 200 Discuss
- 8. Pick out the one which is not a chemical coagulant.
Options- A. Aluminium sulphate
- B. Ferrous sulphate
- C. Hydrated lime
- D. Chloramine Discuss
- 9. Main pollutants released from petroleum refineries is
Options- A. CO, SO2 & H2S.
- B. CO2, NO & SO3.
- C. CO2, H2S & NO2.
- D. SO3, NO2 & CO2. Discuss
- 10. Thermal pollution due to excessive heat & temperature in the working place causes
Options- A. reduction in working efficiency of manpower.
- B. fatigue.
- C. high breathing rate.
- D. all (a), (b) & (c). Discuss
Environmental Engineering problems
Search Results
Correct Answer: 4
Correct Answer: Temporary hardness
Correct Answer: t = 15 - 0.0065h
Correct Answer: asphyxiation (suffocation) leading to death.
Correct Answer: Ozone
Correct Answer: 80
Correct Answer: 400
Correct Answer: Chloramine
Correct Answer: CO, SO2 & H2S.
Correct Answer: all (a), (b) & (c).
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