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MCQs

Total Questions : 181 | Page 4 of 19 pages
Question 31. How many types of sedimentation tanks are there on the basis of the method of operation?
  1.    2
  2.    3
  3.    4
  4.    5
 Discuss Question
Answer: Option A. -> 2
Answer: (a).2
Question 32. When the impurities are separated by the gravitation of settling particles, the operation is called ______
  1.    Sedimentation with coagulant
  2.    Plain sedimentation
  3.    Secondary sedimentation
  4.    Disinfection
 Discuss Question
Answer: Option B. -> Plain sedimentation
Answer: (b).Plain sedimentation
Question 33. In which type of sedimentation, the flocculent suspension of the intermediate concentration takes place?
  1.    Type I sedimentation
  2.    Type II sedimentation
  3.    Type III sedimentation
  4.    Type IV sedimentation
 Discuss Question
Answer: Option C. -> Type III sedimentation
Answer: (c).Type III sedimentation
Question 34. In which type of sedimentation, the flocculent suspension of high concentration takes place?
  1.    Type I sedimentation
  2.    Type II sedimentation
  3.    Type III sedimentation
  4.    Type IV sedimentation
 Discuss Question
Answer: Option D. -> Type IV sedimentation
Answer: (d).Type IV sedimentation
Question 35. What is the settling velocity of the particle in the wastewater if its diameter is 2 * 10⁻³ cm. Given G=2.65, viscosity v=8 * 10⁻³ cm²/Sec?
  1.    0.01cm/Sec
  2.    0.13cm/Sec
  3.    0.24cm/Sec
  4.    0.36cm/Sec
 Discuss Question
Answer: Option B. -> 0.13cm/Sec
Answer: (b).0.13cm/Sec
Question 36. Which gas is released when alum is added to water?
  1.    Al (OH)₃
  2.    CaSO₄
  3.    CO₂
  4.    Ca (OH)₃
 Discuss Question
Answer: Option C. -> CO₂
Answer: (c).CO₂
Question 37. Alum is effective when pH of water is between ____
  1.    8-10
  2.    6-8
  3.    6.5-8.5
  4.    7-9
 Discuss Question
Answer: Option C. -> 6.5-8.5
Answer: (c).6.5-8.5
Question 38. What indicates the permanent hardness when alum is added to water?
  1.    Al (OH)₃
  2.    CaSO₄
  3.    CO₂
  4.    Ca (OH)₃
 Discuss Question
Answer: Option B. -> CaSO₄
Answer: (b).CaSO₄
Question 39. Why Alum is preferred over other coagulants?
  1.    It is easy to dewater the sludge formed
  2.    It imparts corrosiveness to water
  3.    It reduces taste and odor in addition to turbidity
  4.    The time required for floc formation is less
 Discuss Question
Answer: Option C. -> It reduces taste and odor in addition to turbidity
Answer: (c).It reduces taste and odor in addition to turbidity
Question 40. The chemical composition of Chlorinated Copperas is __________
  1.    Fe₂ (SO₄)₃ + FeCl₃
  2.    FeSO₄.9H₂O
  3.    FeSO₄.18H₂O
  4.    Fe₂ (SO₄)₃
 Discuss Question
Answer: Option A. -> Fe₂ (SO₄)₃ + FeCl₃
Answer: (a).Fe₂ (SO₄)₃ + FeCl₃

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