Air Pollution MCQ – Environmental Engineering

101. According the National Ambient Air Quality Standards (NAAQS), the permissible limit (daily average) for RSPM in Residential area is

  1. 40 μg/m3
  2. 60 μg/m3
  3. 100 μg/m3
  4. 120 μg/m3
Answer. b

102. The effective height of the chimney is equal to

  1. Height of the chimney + plume rise
  2. Height of the chimney + plume rise + thermal rise
  3. Height of the chimney + plume rise + pressure rise
  4. Height of the chimney – plume rise
Answer. a

103. In a Gaussian Dispersion Model, the lateral dispersion coefficients are dependent on

  1. Surface roughness
  2. Atmospheric stability
  3. Downwind distance
  4. Both Atmospheric stability and Downwind distance
Answer. d

104. Which one of the following procedures is used for sampling of the flue gas in a chimney for Suspended Particulate Matter (SPM)?

  1. Isothermal sampling
  2. Isokinetic sampling
  3. Adiabatic sampling
  4. Differential sampling
Answer. b

105. The main reasons of the sick building syndrome focusing the Indoor Air Quality in buildings is

  1. inadequate ventilation
  2. contamination from inside the buildings
  3. contamination from outside buildings
  4. microbial contamination
Answer. a

106. The maximum annual average concentration of total suspended particulate matter as per National ambient air quality standard is

  1. 78 μg/m3
  2. 140 μg/m3
  3. 250 μg/m3
  4. 55 μg/m3
Answer. b

107. Peroxy-acetyl-nitrate is formed due

  1. the interaction of lead and nitrites
  2. the interaction of carbon monoxide and sulphates
  3. interactions of hydrocarbons and oxidants like SO2 under influence of sunlight
  4. the interaction of carbon dioxide and water
Answer. c

108. Presence of SO2 and moisture

  1. will not have any effect on metallic surfaces
  2. will lead to global warming in atmosphere
  3. will slow down the corrosion mechanism on metallic surface
  4. will accelerate corrosion of metallic surface
Answer. d

109. When the environmental lapse rate is less then dry adiabatic lapse rate, the rising particle becomes cooler and denser than its surroundings and tends to fall back to its original position. This lapse rate is called

  1. Super adiabatic Lapse rate
  2. Sub adiabatic Lapse rate
  3. Dry adiabatic Lapse rate
  4. Adiabatic Lapse rate
Answer. b

110. In the language of air pollution which of the following is NOT a technique for controlling odour?

  1. Removal
  2. Dilution
  3. Amplification
  4. Conversion
Answer. c
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