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  • Question

  • Photochemical smog is formed from automobile exhaust


  • Options
  • A. by reaction of hydrocarbon & nitric oxide in presence of sunlight.
  • B. appears only on sunny days.
  • C. is harmful for crops and trees also besides causing eye irritation & asthma.
  • D. all (a), (b) & (c)

  • Correct Answer
  • all (a), (b) & (c) 

    • Environmental Engineering problems

    Search Results

    • 1. Threshold limit value (TLV) means maximum permissible/acceptable concentration. TLV of phosgene in air is about __________ ppm (parts per million).

    • Options
    • A. 0.002
    • B. 0.2
    • C. 1.2
    • D. 4.8
      • Discuss
    • 2. Disinfection of water is done to remove

    • Options
    • A. color
    • B. bad taste
    • C. foul odour
    • D. bacteria
      • Discuss
    • 3. The average thickness of ozone layer in stratosphere is about __________ dobson unit (DU).

    • Options
    • A. 20
    • B. 230
    • C. 750
    • D. 1500
      • Discuss
    • 4. Which of the following is not a natural source of air pollution?

    • Options
    • A. Volcanic eruptions and lightening discharges.
    • B. Biological decay of vegetable matter.
    • C. Photochemical oxidation of organic matter.
    • D. None of these.
      • Discuss
    • 5. The density of the gases (present in air) decreases with increasing altitude to such an extent, that about 70% of the mass of atmospheric air is found in the lower 5 km. of the atmosphere. This lower region of atmosphere is called the

    • Options
    • A. ionosphere
    • B. troposphere
    • C. stratosphere
    • D. none of these
      • Discuss
    • 6. Fluorosis is caused due to the presence of excessive amount of __________ in drinking water.

    • Options
    • A. mercury
    • B. lead
    • C. fluoride
    • D. arsenic
      • Discuss
    • 7. Water filtration rate in a rapid sand filter ranges from __________ kilolitres/m2/hr.

    • Options
    • A. 0.1 to 1
    • B. 3 to 6
    • C. 10 to 15
    • D. 15 to 20
      • Discuss
    • 8. Pick out the wrong statement.

    • Options
    • A. Biological oxygen demand (BOD) is a characteristic and not a constituent of water.
    • B. BOD is a measure of the amount of oxygen which will be demanded & used in 5 days by the biological decomposition of the organic matter present in water stream present as food for the living organism.
    • C. BOD is expressed in mg/litre (typically, BOD=2.5 mg/litre for potable water).
    • D. none of these
      • Discuss
    • 9. The weakest sound that can be heard by a person in a quiet environment is equivalent to __________ decibel.

    • Options
    • A. 1
    • B. 5
    • C. 10
    • D. 20
      • Discuss
    • 10. Water filtration rate in a slow sand filter ranges from __________ litres/m2/hr.

    • Options
    • A. 10 to 20
    • B. 100 to 200
    • C. 1500 to 2500
    • D. 4000 to 5000
      • Discuss

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