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- Question
Septic tanks are used for the __________ of the deposited solids.
Options- A. separation
- B. anaerobic decomposition
- C. aerobic decomposition
- D. none of these
- Correct Answer
- anaerobic decomposition
- 1. Which of the following is a green house gas other than CO2?
Options- A. Methane
- B. Nitrous oxide
- C. Chlorofluro carbons (CFC)
- D. All (a), (b) and (c) Discuss
- 2. BOD of raw municipal sewage may be in the range of about __________ mg/litre.
Options- A. 1-2
- B. 5-10
- C. 150-300
- D. 2000-3000 Discuss
- 3. Pollution by particulate matter emission in the atmosphere does not take place during metal
Options- A. grinding
- B. machining
- C. cutting
- D. polishing Discuss
- 4. Presence of a certain minimum quantity of flourine is desirable in potable water to prevent
Options- A. dental cavities
- B. scale formation
- C. water-borne disease
- D. corrosion Discuss
- 5. Automobile exhaust is passed through two compartments catalytic converter employing platinum as catalyst for
Options- A. conversion of CO into CO2 in the second compartment.
- B. conversion of NOx into N2 and NH3 in the first compartment.
- C. oxidation of unburnt hydrocarbon fuel in the second compartment.
- D. all (a), (b) and (c). Discuss
- 6. A gas is termed as non-toxic, if its maximum permissible concentration (TLV) ranges from __________ ppm.
Options- A. 1000 to 2000
- B. 3000 to 6000
- C. 6000 to 9000
- D. 10000 to 100000 Discuss
- 7. Inhalation of silica dust causes a disease called
Options- A. bronchitis
- B. silicosis
- C. pneumoconiosis
- D. none of these Discuss
- 8. Pick out the wrong statement.
Options- A. Benzopyrene which causes cancer is present in traces in tobacco, charcoal & petrol driven automobile exhaust.
- B. NO2 is capable of penetrating the troposphere and can absorb both ultraviolet & visible light.
- C. Hydrocarbon pollutants are produced by sweet gum, oak & natural rubber trees.
- D. H2S is not at all produced during combustion of sulphur bearing fuels as all the sulphur is oxidised to SO2. Discuss
- 9. Removal of __________ is accomplished by aeration of water.
Options- A. dissolved gases
- B. suspended solids
- C. dissolved solids
- D. none of these Discuss
- 10. Which of the following is not an air pollutant?
Options- A. Ozone
- B. Carcinogens
- C. Pesticides
- D. Metallic powders Discuss
Environmental Engineering problems
Search Results
Correct Answer: All (a), (b) and (c)
Correct Answer: 150-300
Correct Answer: polishing
Correct Answer: dental cavities
Correct Answer: all (a), (b) and (c).
Correct Answer: 10000 to 100000
Correct Answer: silicosis
Correct Answer: H2S is not at all produced during combustion of sulphur bearing fuels as all the sulphur is oxidised to SO2.
Correct Answer: dissolved gases
Correct Answer: Ozone
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