Environmental Engineering problems
- 1. World environment day is observed every year on the 5th of
Options- A. June
- B. December
- C. July
- D. September Discuss
Correct Answer: June
- 2. Pick out the correct statement.
Options- A. Noise from ball mills can be dealt with by fibre glass lined enclosures.
- B. Noise from vibrating chutes can be reduced by lining the metallic chute with rubber.
- C. Noise of conveyor belt system is reduced by using urethane coated cloth conveyor belts and rubber/plastic covered metallic rollers.
- D. all (a), (b) & (c). Discuss
Correct Answer: all (a), (b) & (c).
- 3. 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
Correct Answer: all (a), (b) and (c).
- 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
Correct Answer: dental cavities
- 5. Pollution by particulate matter emission in the atmosphere does not take place during metal
Options- A. grinding
- B. machining
- C. cutting
- D. polishing Discuss
Correct Answer: polishing
- 6. 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
Correct Answer: 150-300
- 7. 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
Correct Answer: All (a), (b) and (c)
- 8. Septic tanks are used for the __________ of the deposited solids.
Options- A. separation
- B. anaerobic decomposition
- C. aerobic decomposition
- D. none of these Discuss
Correct Answer: anaerobic decomposition
- 9. 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
Correct Answer: 10000 to 100000
- 10. Inhalation of silica dust causes a disease called
Options- A. bronchitis
- B. silicosis
- C. pneumoconiosis
- D. none of these Discuss
Correct Answer: silicosis
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