Environmental Engineering problems
- 1. Fresh sewage is __________ in nature.
Options- A. acidic
- B. neutral
- C. alkaline
- D. highly acidic Discuss
Correct Answer: alkaline
- 2. The earth's atmosphere is an envelope of gases present upto a height of about __________ kms.
Options- A. 10
- B. 200
- C. 1000
- D. 2000 Discuss
Correct Answer: 200
- 3. Which of the following gases is having the widest explosion limit (about 2 to 81% gas in gas-air mixture), rendering it the property of the most explosive gas?
Options- A. Hydrogen
- B. Acetylene
- C. Carbon monoxide
- D. Ammonia Discuss
Correct Answer: Acetylene
- 4. A standard test for determination of hardness in water is termed as __________ test.
Options- A. EDTA
- B. electometric
- C. total count
- D. presumptive Discuss
Correct Answer: EDTA
- 5. Which of the following is not a weightless pollutant?
Options- A. SPM
- B. Thermal pollution
- C. Radioactive rays
- D. Noise pollution Discuss
Correct Answer: SPM
- 6. Aerosols present in atmospheric air may be
Options- A. positively charged.
- B. negatively charged.
- C. neutral.
- D. combination of all (a), (b) & (c). Discuss
Correct Answer: combination of all (a), (b) & (c).
- 7. Phenolic water generated in coke ovens & by-product plant of a steel plant are disposed off by
Options- A. quenching of hot coke.
- B. discharging in the river stream.
- C. filtration and recycling for cooling coke oven gas.
- D. none of these. Discuss
Correct Answer: quenching of hot coke.
- 8. For existence of aquatic life in water, the dissolved oxygen content in it, should not be less than __________ ppm.
Options- A. 10000
- B. 5
- C. 500
- D. 1000 Discuss
Correct Answer: 5
- 9. In a sedimentation tank, the detention period for water ranges from __________ hours.
Options- A. 2 to 4
- B. 8 to 12
- C. 16 to 20
- D. 24 to 32 Discuss
Correct Answer: 2 to 4
- 10. The maximum permissible noise level to which a man working in a chemical plant can be exposed for eight hours per day is about __________ decibels.
Options- A. 60
- B. 90
- C. 105
- D. 120 Discuss
Correct Answer: 90
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