Environmental Engineering problems
- 1. Permissible safe limit (TLV) of __________ toxic gas is 100-1000 parts per million (ppm).
Options- A. highly
- B. moderately
- C. extremely
- D. very extremely Discuss
Correct Answer: moderately
- 2. Which of the following is the most major constituents of air pollutants?
Options- A. Oxides of sulphur
- B. Oxides of nitrogen
- C. Carbon monoxide
- D. Hydrogen sulphide Discuss
Correct Answer: Oxides of sulphur
- 3. Presence of high concentration of ozone and smog in atmospheric air causes the
Options- A. embrittlement & decrease of folding resistance of paper.
- B. cracking of rubber products.
- C. fading of dye on textiles.
- D. damage of electrical insulator on high tension power line. Discuss
Correct Answer: cracking of rubber products.
- 4. Carbonaceous particles having size less than 1 ?m are called
Options- A. grit
- B. aggregates
- C. aerosols
- D. smoke Discuss
Correct Answer: smoke
- 5. High concentration of carcinogenic hydrocarbon pollutants in atmospheric air causes
Options- A. cancer
- B. silicosis
- C. respiratory disease (e.g., asthma)
- D. reduced crop yield Discuss
Correct Answer: cancer
- 6. In the context of the chemical process industries, the term BOD is normally associated with the
Options- A. characterisation of solid wastes.
- B. organic concentration in gaseous effluents.
- C. characterisation of liquid effluents.
- D. characterisation of boiler feed water. Discuss
Correct Answer: characterisation of liquid effluents.
- 7. Presence of iron and manganese in water causes
Options- A. reduction in its dissolved oxygen content.
- B. discoloration of bathroom fixtures.
- C. temporary hardness.
- D. none of these. Discuss
Correct Answer: discoloration of bathroom fixtures.
- 8. Most of the bacteria in sewage are
Options- A. parasitic
- B. saprophytic
- C. anerobic
- D. none of these Discuss
Correct Answer: saprophytic
- 9. Solid content in most of the domestic sewage is about __________ percent.
Options- A. 0.001
- B. 0.1
- C. 5
- D. 10 Discuss
Correct Answer: 0.1
- 10. Limestone powder is injected during pulverised coal burning in boilers to __________ the flue gases.
Options- A. reduce SO2 content in
- B. catalytically convert SO2 to SO3 in
- C. increase the dew point of
- D. none of these. Discuss
Correct Answer: reduce SO2 content in
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