Discussion
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- Question
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
- Correct Answer
- Acetylene
- 1. 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
- 2. Fresh sewage is __________ in nature.
Options- A. acidic
- B. neutral
- C. alkaline
- D. highly acidic Discuss
- 3. The main industrial source of emission of hydrogen sulphide air pollutant is
Options- A. petroleum refineries.
- B. coal based thermal power plants.
- C. pulp and paper plant.
- D. metallurgical roasting & smelting plant. Discuss
- 4. Iron & manganese present in the polluted water is removed by
Options- A. simple filtration.
- B. oxidation followed by settling & filtration.
- C. chemical coagulation.
- D. chlorination only. Discuss
- 5. Bacterial aerobic oxidation of polluted water in biological oxidation ponds is done to purify it. Presence of bacteria helps in
Options- A. coagulation and flocculation of colloids.
- B. oxidation of carbonaceous matter to CO2.
- C. nitrification or oxidation of ammonia derived from breakdown of nitrogeneous organic matter to the nitrite and eventually to the nitrate.
- D. all (a), (b) and (c). Discuss
- 6. A standard test for determination of hardness in water is termed as __________ test.
Options- A. EDTA
- B. electometric
- C. total count
- D. presumptive Discuss
- 7. Which of the following is not a weightless pollutant?
Options- A. SPM
- B. Thermal pollution
- C. Radioactive rays
- D. Noise pollution Discuss
- 8. Aerosols present in atmospheric air may be
Options- A. positively charged.
- B. negatively charged.
- C. neutral.
- D. combination of all (a), (b) & (c). Discuss
- 9. 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
- 10. 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
Environmental Engineering problems
Search Results
Correct Answer: 200
Correct Answer: alkaline
Correct Answer: coal based thermal power plants.
Correct Answer: oxidation followed by settling & filtration.
Correct Answer: all (a), (b) and (c).
Correct Answer: EDTA
Correct Answer: SPM
Correct Answer: combination of all (a), (b) & (c).
Correct Answer: quenching of hot coke.
Correct Answer: 5
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