Discussion
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- Question
Carbonaceous particles having size less than 1 ?m are called
Options- A. grit
- B. aggregates
- C. aerosols
- D. smoke
- Correct Answer
- smoke
- 1. 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
- 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
- 3. 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
- 4. Which of the following acts as a natural source of air pollution?
Options- A. Forest fire
- B. Deforestation
- C. Volcanic eruption
- D. None of these Discuss
- 5. Irradiation of water by ultraviolet light of suitable wavelength is commonly used for disinfection of water in
Options- A. food industry.
- B. municipal sewage treatment.
- C. petroleum refinery.
- D. iron & steel plant. Discuss
- 6. 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
- 7. 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
- 8. 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
- 9. Most of the bacteria in sewage are
Options- A. parasitic
- B. saprophytic
- C. anerobic
- D. none of these Discuss
- 10. Solid content in most of the domestic sewage is about __________ percent.
Options- A. 0.001
- B. 0.1
- C. 5
- D. 10 Discuss
Environmental Engineering problems
Search Results
Correct Answer: cracking of rubber products.
Correct Answer: Oxides of sulphur
Correct Answer: moderately
Correct Answer: Volcanic eruption
Correct Answer: food industry.
Correct Answer: cancer
Correct Answer: characterisation of liquid effluents.
Correct Answer: discoloration of bathroom fixtures.
Correct Answer: saprophytic
Correct Answer: 0.1
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