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MCQs

Total Questions : 91 | Page 8 of 10 pages
Question 71. . Temporary hardness of water may be removed by adding
  1.    calcium hydroxide
  2.    calcium carbonate
  3.    calcium chloride
  4.    sodium bicarbonate
 Discuss Question
Answer: Option A. -> calcium hydroxide
Question 72. . From the following sanitizers which one comes under category of surface active agents?
  1.    Tetra phosphate
  2.    Teepol
  3.    Meta phosphate
  4.    None of these
 Discuss Question
Answer: Option B. -> Teepol
Question 73. . The maximum desirable limit (BIS of mercury in the drinking water is
  1.    0.05 mg/l
  2.    0.9 mg/l
  3.    0.1 mg/l
  4.    0.001 mg/l
 Discuss Question
Answer: Option D. -> 0.001 mg/l
Question 74. . The purest form of naturally occurring water is
  1.    rain water
  2.    river water
  3.    pond water
  4.    well water
 Discuss Question
Answer: Option A. -> rain water
Question 75. . Calgon is used for removal of
  1.    sodium carbonate
  2.    permanent hardness of water
  3.    potassium carbonate
  4.    none of these
 Discuss Question
Answer: Option B. -> permanent hardness of water
Question 76. . The water being used in dairy industry should contain not more than
  1.    5 proteolytic and/or lipolytic organisms per ml
  2.    10 proteolytic and/or lipolytic organisms per ml
  3.    15 proteolytic and/or lipolytic organisms per ml
  4.    20 proteolytic and/or lipolytic organisms/ml
 Discuss Question
Answer: Option A. -> 5 proteolytic and/or lipolytic organisms per ml
Question 77. . The activated sludge process consists of returning a portion of the clarifier
  1.    effluent water entering the reactor
  2.    influent water coming out of the reactor
  3.    influent water entering the reactor
  4.    effluent water coming out of the reactor
 Discuss Question
Answer: Option C. -> influent water entering the reactor
Question 78. . 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 79. . 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 80. . 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

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