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- Question
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.
- Correct Answer
- oxidation followed by settling & filtration.
- 1. 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
- 2. Noise level during normal conversation among men is about __________ decibles.
Options- A. 10
- B. 45
- C. 90
- D. 115 Discuss
- 3. COD of raw municipal sewage may be in the range of about __________ mg/litre.
Options- A. 1-2
- B. 5-10
- C. 90-120
- D. 1500-2500 Discuss
- 4. Foaming and priming in boiler operation can be reduced by reduction in __________ in feed water.
Options- A. turbidity
- B. color (Hazen)
- C. total solids
- D. all (a), (b) & (c) Discuss
- 5. Waste/polluted water discharged from electroplating, blast furnace and coal mining industries contain mainly __________ substances.
Options- A. radioactive
- B. organic
- C. inorganic
- D. none of these Discuss
- 6. 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
- 7. Fresh sewage is __________ in nature.
Options- A. acidic
- B. neutral
- C. alkaline
- D. highly acidic Discuss
- 8. 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
- 9. 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
- 10. A standard test for determination of hardness in water is termed as __________ test.
Options- A. EDTA
- B. electometric
- C. total count
- D. presumptive Discuss
Environmental Engineering problems
Search Results
Correct Answer: all (a), (b) and (c).
Correct Answer: 45
Correct Answer: 90-120
Correct Answer: all (a), (b) & (c)
Correct Answer: inorganic
Correct Answer: coal based thermal power plants.
Correct Answer: alkaline
Correct Answer: 200
Correct Answer: Acetylene
Correct Answer: EDTA
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