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MCQs

Total Questions : 91 | Page 6 of 10 pages
Question 51.  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
Question 52. . Secondary treatment uses __________ to consume wastes.
  1.    micro-organisms
  2.    chemicals
  3.    filtration
  4.    none of these
 Discuss Question
Answer: Option A. -> micro-organisms
Question 53. . Application of quaternary ammonium compounds as sanitizing agents tends to
  1.    favor gram positive bacteria
  2.    decrease gram positive bacteria
  3.    increase the percentage of gram(-)ve rods on utensils
  4.    none of the above
 Discuss Question
Answer: Option C. -> increase the percentage of gram(-)ve rods on utensils
Question 54. . Permanent hardness of water is caused by the presence of
  1.    bicarbonates of calcium and magnesium
  2.    carbonates of sodium and potassium
  3.    chlorides and sulfates of calcium and magnesium
  4.    phosphates of sodium and potassium
 Discuss Question
Answer: Option C. -> chlorides and sulfates of calcium and magnesium
Question 55. . According to BIS the maximum permissible limit of dissolved solids in drinking water is
  1.    1000 mg/l
  2.    500 mg/l
  3.    2000 mg/l
  4.    1500 mg/l
 Discuss Question
Answer: Option C. -> 2000 mg/l
Question 56. . Acid used mostly for removal of milk stone is
  1.    phosphoric acid
  2.    nitric acid
  3.    gluconic acid
  4.    tartaric acid
 Discuss Question
Answer: Option B. -> nitric acid
Question 57. .  Which of the following chemical is sometime added in the process of coagulation and flocculation?
  1.    Aluminum sulphate
  2.    Aluminum oxide
  3.    Calcium chloride
  4.    None of these
 Discuss Question
Answer: Option A. -> Aluminum sulphate
Question 58. . 
Which of the following physical method is used as germicidal in modern time for the treatment of drinking water?
  1.    Chlorination
  2.    Treating with potassium permagnate
  3.    UV radiation
  4.    Treating with bleaching powder
 Discuss Question
Answer: Option C. -> UV radiation
Question 59. . 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
Question 60. . The common methods used for disinfection in waste water treatment plants are
  1.    chlorination
  2.    UV light
  3.    both (a) and (b)
  4.    Phenolic solvent
 Discuss Question
Answer: Option C. -> both (a) and (b)

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