Environmental Engineering problems
- 1. Maximum allowable noise exposure limits for a man working for 8 hours a day in a noisy chemical plant is about __________ decibels.
Options- A. 20
- B. 60
- C. 90
- D. 120 Discuss
Correct Answer: 90
- 2. 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
Correct Answer: 95
- 3. Nitrogen oxides (NOx) is not produced in the __________ industry.
Options- A. nitric acid making
- B. nitrogenous fertiliser
- C. detergent
- D. any of these Discuss
Correct Answer: detergent
- 4. 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
Correct Answer: automobile exhaust.
- 5. 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
Correct Answer: 20
- 6. 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
Correct Answer: potassium cyanide
- 7. 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 Discuss
Correct Answer: 5-10
- 8. Presence of bacteria in potable (drinking) water causes
Options- A. turbidity
- B. disease
- C. bad odour
- D. bad taste & colour Discuss
Correct Answer: disease
- 9. '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
Correct Answer: None of these
- 10. 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
Correct Answer: 4
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