Air Pollution MCQ – Environmental Engineering

91. What is the permissible limit of 24 hourly particulate matter (size less than 0 μm) or PM 10 concentration in residential area as per Indian Standard?

  1. 60 μg/m3
  2. 80 μg/m3
  3. 00 μg/m3
  4. none of these
Answer. a

92. The major contributor of Carbon monoxide in atmosphere is

  1. Motor vehicle
  2. Industrial processes
  3. Stationary fuel combustion
  4. None of these
Answer. a

93. Following are the 4 scenarios given relating the Environmental Lapse Rate (ELR) and Dry Adiabatic Lapse Rate (DALR). In which of the case, the mixing height would be the maximum.

  1. ELR >> DALR
  2. ELR = DALR
  3. ELR << DALR
  4. ELR = 0.75 × DALR
Answer. a

94. In a condition when Environmental Lapse Rate (ELR) >> Dry Adiabatic Lapse Rate (DALR), which of the following plume behavior would be observed?

  1. Looping
  2. Fanning
  3. Conning
  4. Lofting
Answer. a

95. The major source of carbon monoxide in the urban atmosphere is due to

  1. Decomposition of organics
  2. Chemical reaction between VOC and NOx
  3. Human respiration
  4. Incomplete combustion of fuel
  5. Use of LPG gas for domestic purposes
Answer. a

96. Arrange the following Greenhouse gases in the increasing order of their Global Warming Potential:

  1. Methane < Nitrous Oxide < Hydrochloro-flurocarbon-22 < Sulphur hexafluoride
  2. Nitrous Oxide < Methane < Hydrochloro-flurocarbon-22 < Sulphur hexafluoride
  3. Methane < Nitrous Oxide < Sulphur hexafluoride < Hydrochloroflurocarbon-22
  4. Methane < Hydrochloroflurocarbon-22 < Nitrous Oxide < Sulphur hexafluoride
Answer. a

97. Central Pollution Control board recently labeled which five chemicals as toxic in the manufacturing of crackers and there by prohibited their respective use?

  1. Antimony, Lithium, Mercury, Arsenic and Lead
  2. Antimony, Lithium, Chromium, Lead and Nickel
  3. Cadmium, Lead, Nickel, Zinc and Iron
  4. Beryllium, Cadmium, Mercury, Chromium and Nickel
Answer. a

98. Ringelmann Chart is most commonly used for

  1. estimating the density of smoke
  2. estimating the direction of smoke
  3. estimating the particulate matter from automobiles
  4. estimating the flue gas velocity
Answer. a

99. Which of the following air pollution control equipment is not an example of Inertial Separators?

  1. Baffle type separator
  2. Louver type separator
  3. Dust trap
  4. Settling chamber
Answer. d

100. Which of the following plume behavior will have the most severe implications on human health?

  1. Coning
  2. Fanning
  3. Trapping
  4. Fumigation
Answer. d
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