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MCQs

Total Questions : 91 | Page 3 of 10 pages
Question 21. 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
Answer: (b).distillation
Question 22. 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
Answer: (d).human feces
Question 23. The chemical oxygen demand (COD)measures the
  1.    amount of oxygen required for growth of microorganisms in water
  2.    amount of oxygen that would be removed from the water in order to oxidize pollution
  3.    amount of oxygen required to oxidize the calcium present in waste water
  4.    none of the above
 Discuss Question
Answer: Option B. -> amount of oxygen that would be removed from the water in order to oxidize pollution
Answer: (b).amount of oxygen that would be removed from the water in order to oxidize pollution
Question 24. Zeolite softening process removes
  1.    only temporary hardness of water
  2.    only permanent hardness of water
  3.    both temporary and permanent hardness of water
  4.    the dissolved gases in permanent hard water
 Discuss Question
Answer: Option C. -> both temporary and permanent hardness of water
Answer: (c).both temporary and permanent hardness of water
Question 25. Conventional tertiary treatment is
  1.    chemical coagulation and flocculation
  2.    filtration
  3.    sedimentation
  4.    none of these
 Discuss Question
Answer: Option A. -> chemical coagulation and flocculation
Answer: (a).chemical coagulation and flocculation
Question 26. The maximum desirable limit Bureau of Indian Standards (BIS) of lead in the drinking water is
  1.    0.05 mg/l
  2.    0.09 mg/l
  3.    0.1 mg/l
  4.    1.0 mg/l
 Discuss Question
Answer: Option A. -> 0.05 mg/l
Answer: (a).0.05 mg/l
Question 27. The maximum desirable limit (BIS) of total hardness (as CaCo3) in drinking water is
  1.    600 ppm
  2.    300 ppm
  3.    500 ppm
  4.    1000 ppm
 Discuss Question
Answer: Option B. -> 300 ppm
Answer: (b).300 ppm
Question 28. 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
Answer: (c).UV radiation
Question 29. Sanitizers used for rubber made equipments are
  1.    strong acids
  2.    strong alkalis
  3.    combination of both
  4.    none of these
 Discuss Question
Answer: Option B. -> strong alkalis
Answer: (b).strong alkalis
Question 30. 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)
Answer: (c).both (a) and (b)

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