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- Question
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
- Correct Answer
- 1
- 1. 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
- 2. 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
- 3. Fluorosis is caused due to the presence of excessive amount of __________ in drinking water.
Options- A. mercury
- B. lead
- C. fluoride
- D. arsenic Discuss
- 4. 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
- 5. 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
- 6. Water filtration rate in a slow sand filter ranges from __________ litres/m2/hr.
Options- A. 10 to 20
- B. 100 to 200
- C. 1500 to 2500
- D. 4000 to 5000 Discuss
- 7. Presence of nitrogen in high concentration in contaminated air reduces partial pressure of oxygen in lungs, thereby causing asphyxia (suffocation) leading to death from oxygen deficiency. Concentration of N2 in contaminated air at which it acts as a natural asphyxant is ? __________ percent.
Options- A. 84
- B. 88
- C. 80
- D. 92 Discuss
- 8. The pH value of potable water should be between
Options- A. 1 to 1.5
- B. 6.5 to 8
- C. 13 to 14
- D. 4 to 5 Discuss
- 9. Maximum permissible residual chlorine in treated water should be __________ mg/litre.
Options- A. 0.001 to 0.01
- B. 02 to 0.3
- C. 2 to 3
- D. 5 to 10 Discuss
- 10. Disinfection of water is done to destroy pathogenic bacteria and thus prevent water-borne diseases. Disinfection of water may be done by the use of
Options- A. ozone and iodine.
- B. chlorine or its compounds.
- C. ultraviolet light for irradiation of water.
- D. all (a), (b) & (c). Discuss
Environmental Engineering problems
Search Results
Correct Answer: none of these
Correct Answer: 3 to 6
Correct Answer: fluoride
Correct Answer: all (a), (b) & (c)
Correct Answer: 0.2
Correct Answer: 100 to 200
Correct Answer: 84
Correct Answer: 6.5 to 8
Correct Answer: 02 to 0.3
Correct Answer: all (a), (b) & (c).
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