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MCQs

Total Questions : 91 | Page 9 of 10 pages
Question 81. . Zeolite softening process removes both temporary and permanent hardness of water. In this process the calcium and magnesium present in water are precipitated as
  1.    insoluble carbonates
  2.    insoluble zeolites
  3.    insoluble chlorides
  4.    insoluble sulfates
 Discuss Question
Answer: Option B. -> insoluble zeolites
Question 82. . The methods used for biological treatment are
  1.    lagoon
  2.    activated sludge process
  3.    oxidation ditches
  4.    all of these
 Discuss Question
Answer: Option D. -> all of these
Question 83. . Both temporary and permanent hardness of water can be removed by
  1.    boiling
  2.    distillation
  3.    filtration
  4.    decantation
 Discuss Question
Answer: Option B. -> distillation
Question 84. . Coliform bacteria in water is an indication of the presence of
  1.    radioactive wastes
  2.    excess fertilizer
  3.    decaying animals and plants
  4.    human feces
 Discuss Question
Answer: Option D. -> human feces
Question 85. . The activated sludge process is sometime referred as
  1.    fluid bed biological oxidation system
  2.    fixed bed biological oxidation system
  3.    turning bed biological oxidation system
  4.    none of the above
 Discuss Question
Answer: Option A. -> fluid bed biological oxidation system
Question 86. . BOD stands for
  1.    biochemical oxygen demand
  2.    british oxygen demand
  3.    british oxygen depletion
  4.    biological oxygen depletion
 Discuss Question
Answer: Option A. -> biochemical oxygen demand
Question 87. . When temporary hard water is boiled, one of the substances formed is
  1.    calcium bicarbonate
  2.    calcium sulfate
  3.    hydrogen chloride
  4.    carbon dioxide
 Discuss Question
Answer: Option D. -> carbon dioxide
Question 88. . Zeolite softening process removes both temporary and permanent hardness of water. In this process the calcium and magnesium present in water are precipitated as
  1.    insoluble carbonates
  2.    insoluble zeolites
  3.    insoluble chlorides
  4.    insoluble sulfates
 Discuss Question
Answer: Option B. -> insoluble zeolites
Question 89. . The methods used for biological treatment are
  1.    lagoon
  2.    activated sludge process
  3.    oxidation ditches
  4.    all of these
 Discuss Question
Answer: Option D. -> all of these
Question 90. . Both temporary and permanent hardness of water can be removed by
  1.    boiling
  2.    distillation
  3.    filtration
  4.    decantation
 Discuss Question
Answer: Option B. -> distillation

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