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MCQs

Total Questions : 918 | Page 88 of 92 pages
Question 871. Fresh domestic sewage is __________ in color.
  1.    Dark brown
  2.    Black
  3.    Red
  4.    Grey
 Discuss Question
Answer: Option D. -> Grey
Question 872. Maximum permissible residual chlorine in treated water should be __________ mg/litre.
  1.    5 to 10
  2.    02 to 0.3
  3.    2 to 3
  4.    0.001 to 0.01
 Discuss Question
Answer: Option B. -> 02 to 0.3
Question 873. Smog is
  1.    Nothing but black smoke
  2.    A combination of smoke and fog
  3.    A liquid particle resulting from vapor condensation
  4.    A solid particle e.g. flyash
 Discuss Question
Answer: Option B. -> A combination of smoke and fog
Question 874. Smoke is produced due to
  1.    Poor design & overloading of furnace
  2.    Poor quality of fuel and improper mixing of fuel & combustion air
  3.    Insufficient supply of combustion air and insufficient time for combustion
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Question 875. Carbonaceous particles having size less than 1 μm are called
  1.    Grit
  2.    Aerosols
  3.    Aggregates
  4.    Smoke
 Discuss Question
Answer: Option D. -> Smoke
Question 876. Which of the following air pollutants is not toxic to vegetation i.e., doesn't cause vegetation damage?
  1.    Smog & ozone
  2.    Sulphur dioxide & spray of weed killers
  3.    Carbon monoxide
  4.    Hydrogen fluoride & nitrogen oxides
 Discuss Question
Answer: Option C. -> Carbon monoxide
Question 877. Workers working in __________ industry are most prone to white lung cancer.
  1.    Textile
  2.    Limestone mining
  3.    Coal mining
  4.    Asbestos
 Discuss Question
Answer: Option A. -> Textile
Question 878. The average thickness of ozone layer in stratosphere is about __________ dobson unit (DU).
  1.    750
  2.    20
  3.    230
  4.    1500
 Discuss Question
Answer: Option C. -> 230
Question 879. 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 of these
 Discuss Question
Answer: Option D. -> All of these
Question 880. Inhalation of lead compounds present in automobile exhaust (using leaded petrol) causes
  1.    Nervous system disorder
  2.    Anaemia
  3.    All of these
  4.    Blood poisoning
 Discuss Question
Answer: Option C. -> All of these

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