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MCQs

Total Questions : 91 | Page 4 of 10 pages
Question 31. Inhibitors are used along with sanitizer to
  1.    improve their action
  2.    to prevent corrosion
  3.    both (a) and (b)
  4.    none of these
 Discuss Question
Answer: Option B. -> to prevent corrosion
Answer: (b).to prevent corrosion
Question 32. Sanitizer used specifically for vitreous enamel are
  1.    strong alkalis
  2.    strong acids
  3.    weak alkali with sodium silicate
  4.    none of these
 Discuss Question
Answer: Option C. -> weak alkali with sodium silicate
Answer: (c).weak alkali with sodium silicate
Question 33. 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
Answer: (a).fluid bed biological oxidation system
Question 34. 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
Answer: (b).insoluble zeolites
Question 35. 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
Answer: (d).carbon dioxide
Question 36. 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
Answer: (a).biochemical oxygen demand
Question 37. 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
Answer: (d).all of these
Question 38. Hardness of water does not
  1.    have any bad effect in boiler
  2.    make cooking of foods difficult
  3.    make it unfit for drinking
  4.    cause difficulty in the washing of clothes with soaps
 Discuss Question
Answer: Option C. -> make it unfit for drinking
Answer: (c).make it unfit for drinking
Question 39. Zeolite used in zeolite softening process for the treatment of hard water gets exhausted after certain time of usage but can be regenerated by flushing it with
  1.    10% calcium chloride solution
  2.    10% magnesium sulfate solution
  3.    10% magnesium chloride solution
  4.    10% sodium chloride solution
 Discuss Question
Answer: Option D. -> 10% sodium chloride solution
Answer: (d).10% sodium chloride solution
Question 40. Temporary hardness of water is caused by the presence of
  1.    chlorides of calcium and magnesium
  2.    sulfates of calcium and magnesium
  3.    bicarbonates of calcium and magnesium
  4.    carbonates of sodium and potassium
 Discuss Question
Answer: Option C. -> bicarbonates of calcium and magnesium
Answer: (c).bicarbonates of calcium and magnesium

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