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- Question
Noise pollution level in a chemical plant is expressed in
Options- A. roentgen
- B. decibel
- C. hertz
- D. none of these
- Correct Answer
- decibel
- 1. The maximum permissible noise level to which a man working in a chemical plant can be exposed for eight hours per day is about __________ decibels.
Options- A. 60
- B. 90
- C. 105
- D. 120 Discuss
- 2. In a sedimentation tank, the detention period for water ranges from __________ hours.
Options- A. 2 to 4
- B. 8 to 12
- C. 16 to 20
- D. 24 to 32 Discuss
- 3. For existence of aquatic life in water, the dissolved oxygen content in it, should not be less than __________ ppm.
Options- A. 10000
- B. 5
- C. 500
- D. 1000 Discuss
- 4. Phenolic water generated in coke ovens & by-product plant of a steel plant are disposed off by
Options- A. quenching of hot coke.
- B. discharging in the river stream.
- C. filtration and recycling for cooling coke oven gas.
- D. none of these. Discuss
- 5. Aerosols present in atmospheric air may be
Options- A. positively charged.
- B. negatively charged.
- C. neutral.
- D. combination of all (a), (b) & (c). Discuss
- 6. Ozone is
Options- A. a primary pollutant.
- B. a secondary pollutant.
- C. impervious to ultra-violet rays.
- D. both (b) and (c) Discuss
- 7. The effect of increase in carbon dioxide level of the atmosphere and its profound effect on our climate is called the
Options- A. catalytic conversion
- B. green house effect
- C. global warming
- D. both (b) and (c) Discuss
- 8. Pick out the wrong statement
Options- A. Low ozone layer thickness in polar regions is due to cold climatic conditions
- B. Amount of unburnt hydrocarbons emitted by two stroke petrol engine is more as compared to that emitted by a four stroke engine.
- C. Carbon monoxide present in the two stroke petrol engine exhaust is much less as compared to that emitted from a four stroke engine.
- D. Mercury as a pollutant can enter the blood stream & the digestive system/ lungs and is responsible for causing minamate disease. Discuss
- 9. As per the world health organisation (WHO) specification, the maximum permissible concentration (i.e., TLV) of particulate matter in air is __________ ?g/m3.(?g-microgram)
Options- A. 10
- B. 90
- C. 800
- D. 750 Discuss
- 10. In water treatment plant, zeolite process is used to remove the __________ of water.
Options- A. acidity
- B. alkalinity
- C. hardness
- D. iron & zinc Discuss
Environmental Engineering problems
Search Results
Correct Answer: 90
Correct Answer: 2 to 4
Correct Answer: 5
Correct Answer: quenching of hot coke.
Correct Answer: combination of all (a), (b) & (c).
Correct Answer: both (b) and (c)
Correct Answer: both (b) and (c)
Correct Answer: Carbon monoxide present in the two stroke petrol engine exhaust is much less as compared to that emitted from a four stroke engine.
Correct Answer: 90
Correct Answer: hardness
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