Environmental Engineering

231.Very small amount of air pollutants are present in stratosphere also; though most of the atmospheric pollutants are present in the troposphere. Which of the following atmospheric pollutants does not cause the ozone layer depletion in atmosphere at tremendous rate?

  1. CO
  2. SO2
  3. NOx
  4. CFC (chloro fluoro carbons)
Correct answer: (A)
CO

232.Waste/polluted water discharged from electroplating, blast furnace and coal mining industries contain mainly _________ substances.

  1. Radioactive
  2. Organic
  3. Inorganic
  4. None of these
Correct answer: (C)
Inorganic

233.Water filtration rate in a rapid sand filter ranges from _________ kilolitres/m2/hr.

  1. 0.1 to 1
  2. 3 to 6
  3. 10 to 15
  4. 15 to 20
Correct answer: (B)
3 to 6

234.Water filtration rate in a slow sand filter ranges from _________ litres/m2/hr.

  1. 10 to 20
  2. 100 to 200
  3. 1500 to 2500
  4. 4000 to 5000
Correct answer: (B)
100 to 200

235.What are the methods of treatment&disposal of radioactive wastes?

  1. Evaporation&chemical precipitation
  2. Biological methods&adsorption in ion exchange materials
  3. Fixing into a solid mass with cement and sinking deep in the sea
  4. All (A), (B)&(C)
Correct answer: (D)
All (A), (B)&(C)

236.When the concentration of SO2 in air is greater than _________ ppm, it gives a pungent smell.

  1. 0.01
  2. 0.1
  3. 1
  4. 4
Correct answer: (D)
4

237.Which is the best and the most effective method for the removal of organic contaminant present in the polluted water in very small quantity (say < 200 mg/litre)?

  1. Lagooning
  2. Activated carbon adsorption
  3. Biological oxidation pond
  4. Chemical coagulation
Correct answer: (B)
Activated carbon adsorption

238.Which is the most efficient dust removal equipment for removal of submicronic dust particles from blast furnace gas?

  1. Packed scrubber
  2. Gravity settling chamber
  3. Electrostatic precipitator
  4. Hydrocyclone
Correct answer: (C)
Electrostatic precipitator

239.Which is the most practical and economical method for removal of suspended solid matter from polluted water?

  1. Sedimentation
  2. Skimming off
  3. Chlorination
  4. Biological oxidation
Correct answer: (A)
Sedimentation

240.Which is the most widely used coagulant for the treatment of turbid water?

  1. Alum (aluminium sulphate)
  2. Lime
  3. Ferric chloride
  4. Sodium aluminate
Correct answer: (A)
Alum (aluminium sulphate)
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