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MCQs

Total Questions : 112 | Page 4 of 12 pages
Question 31. What is the detention time of a water softening accelerator?
  1.    1-6minutes
  2.    20minutes
  3.    30 minutes
  4.    1-2hours
 Discuss Question
Answer: Option D. -> 1-2hours
Answer: (d).1-2hours
Question 32. In which process of water softening, ion exchange phenomenon takes place?
  1.    Lime soda process
  2.    Zeolite process
  3.    Boiling
  4.    Demineralization process
 Discuss Question
Answer: Option B. -> Zeolite process
Answer: (b).Zeolite process
Question 33. Zeolites are complex compound of ____________
  1.    Aluminium and lime
  2.    Silica and soda
  3.    Aluminium, silica and soda
  4.    Lime and soda
 Discuss Question
Answer: Option C. -> Aluminium, silica and soda
Answer: (c).Aluminium, silica and soda
Question 34. In which process of water softening, the chemicals are added to remove hardness from water?
  1.    Lime soda process
  2.    Zeolite process
  3.    Boiling
  4.    Demineralization process
 Discuss Question
Answer: Option A. -> Lime soda process
Answer: (a).Lime soda process
Question 35. The sludge in water softening accelerator is deposited at ____________
  1.    Sedimentation tank
  2.    Reaction zone
  3.    Concentrator
  4.    Secondary mixing zone
 Discuss Question
Answer: Option C. -> Concentrator
Answer: (c).Concentrator
Question 36. The presence of Sulfate iron in the water results in ____________
  1.    Odorless water
  2.    Acidity in water
  3.    Colorless water
  4.    Growth of crenothrix in water mains
 Discuss Question
Answer: Option B. -> Acidity in water
Answer: (b).Acidity in water
Question 37. By which process dissolved manganese compounds can be converted into insoluble manganese compounds?
  1.    Aeration
  2.    Coagulation
  3.    Sedimentation
  4.    Flocculation
 Discuss Question
Answer: Option A. -> Aeration
Answer: (a).Aeration
Question 38. The brown tinge in the water is due to the presence of ____________
  1.    Zinc
  2.    Copper
  3.    Iron
  4.    Manganese
 Discuss Question
Answer: Option D. -> Manganese
Answer: (d).Manganese
Question 39. The reddish tinge in the water is due to the presence of ____________
  1.    Zinc
  2.    Copper
  3.    Iron
  4.    Manganese
 Discuss Question
Answer: Option C. -> Iron
Answer: (c).Iron
Question 40. By aeration process, dissolved iron is oxidized into ____________
  1.    Ferrous oxide
  2.    Ferric oxide
  3.    Ferrous hydroxide
  4.    Ferric hydroxide
 Discuss Question
Answer: Option B. -> Ferric oxide
Answer: (b).Ferric oxide

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