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- Question
Ambient noise level can be reduced by __________ decibels by planting trees (like coconut, neem etc.) near public utility buildings (like hospitals & schools).
Options- A. 1-2
- B. 5-10
- C. 15-20
- D. 25-30
- Correct Answer
- 5-10
- 1. Thermal pollution of water increases its toxicity and oxidation of oxygen demanding waste besides favouring bacterial growth. A rise in water temperature by 10°C, doubles the toxic effects of __________ present in it.
Options- A. coal ash
- B. potassium cyanide
- C. ortho-xylene
- D. none of these Discuss
- 2. Acute danger to human life (i.e. death) exists, if the concentration of CO2 in atmospheric air exceeds __________ percent (by volume).
Options- A. 1
- B. 3
- C. 7
- D. 20 Discuss
- 3. Peroxyacyl nitrate (PAN), a pollutant is found in the
Options- A. automobile exhaust.
- B. flue gas of coal based power plant.
- C. exhaust of nitric acid plant.
- D. exhaust of sulphuric acid plant. Discuss
- 4. Nitrogen oxides (NOx) is not produced in the __________ industry.
Options- A. nitric acid making
- B. nitrogenous fertiliser
- C. detergent
- D. any of these Discuss
- 5. Noise level heard inside a bus in busy city traffic or inside a sub-way train corresponds to about __________ decibels.
Options- A. 75
- B. 95
- C. 120
- D. 140 Discuss
- 6. Presence of bacteria in potable (drinking) water causes
Options- A. turbidity
- B. disease
- C. bad odour
- D. bad taste & colour Discuss
- 7. 'Particulate' air pollutants are finely divided solids and liquids. Which of the following is not a 'particulate'?
Options- A. Dust & mists
- B. Smoke & fumes
- C. Photochemical smog & soot
- D. None of these Discuss
- 8. The concentration of water vapour in troposphere, which depends upon the altitude & temperature varies in the range of zero to __________ percent.
Options- A. 1
- B. 4
- C. 8
- D. 12 Discuss
- 9. Ozone level is generally found to be depleted in India in the month of
Options- A. February
- B. July
- C. April
- D. December Discuss
- 10. Moist atmospheric air at high temperature (e.g., in summer) having high concentration of sulphur dioxide causes
Options- A. fading of dyes on textiles.
- B. corrosion, tarnishing & soiling of metals.
- C. reduced strength of textiles.
- D. all (a), (b) and (c). Discuss
Environmental Engineering problems
Search Results
Correct Answer: potassium cyanide
Correct Answer: 20
Correct Answer: automobile exhaust.
Correct Answer: detergent
Correct Answer: 95
Correct Answer: disease
Correct Answer: None of these
Correct Answer: 4
Correct Answer: December
Correct Answer: all (a), (b) and (c).
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