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MCQs

Total Questions : 112 | Page 9 of 12 pages
Question 81. For removal of iron from water ________ mg of oxygen is required.
  1.    0.14
  2.    0.50
  3.    1
  4.    1.5
 Discuss Question
Answer: Option A. -> 0.14
Answer: (a).0.14
Question 82. For removal of manganese from water ________ mg of oxygen is required.
  1.    0.14
  2.    0.50
  3.    0.29
  4.    0.90
 Discuss Question
Answer: Option C. -> 0.29
Answer: (c).0.29
Question 83. Removal of manganese from water takes place at a pH of ______
  1.    1.5
  2.    3
  3.    6
  4.    9.4
 Discuss Question
Answer: Option D. -> 9.4
Answer: (d).9.4
Question 84. Removal of iron from water takes place at a pH of ______
  1.    1.5
  2.    3
  3.    8.2
  4.    9.4
 Discuss Question
Answer: Option D. -> 9.4
Answer: (d).9.4
Question 85. When small amounts of iron and manganese are present in water, they are removed by ____________
  1.    Aeration
  2.    Coagulation
  3.    Manganese zeolite
  4.    Filtration
 Discuss Question
Answer: Option C. -> Manganese zeolite
Answer: (c).Manganese zeolite
Question 86. Which material is used in contact filters for the removal of fluorides?
  1.    Calcium phosphate
  2.    Copper sulfate
  3.    Synthetic tri-calcium phosphate
  4.    Bone charcoal
 Discuss Question
Answer: Option C. -> Synthetic tri-calcium phosphate
Answer: (c).Synthetic tri-calcium phosphate
Question 87. Which of the following method is not used for desalination?
  1.    Distillation
  2.    Coagulation
  3.    Reverse osmosis
  4.    Freezing
 Discuss Question
Answer: Option A. -> Distillation
Answer: (a).Distillation
Question 88. Which material is used for removing fluorides from hard water containing 3ppm of fluorides?
  1.    Lime
  2.    Copper sulfate
  3.    Synthetic tri-calcium phosphate
  4.    Bone charcoal
 Discuss Question
Answer: Option A. -> Lime
Answer: (a).Lime
Question 89. Fluorex is a special mixture of ____________
  1.    Di-calcium phosphate and carbon
  2.    Tri-calcium phosphate and hydroxyapatite
  3.    Di-calcium phosphate and phosphoric acid
  4.    Tri-calcium phosphate and carbon
 Discuss Question
Answer: Option B. -> Tri-calcium phosphate and hydroxyapatite
Answer: (b).Tri-calcium phosphate and hydroxyapatite
Question 90. Which of the following is not a type of distillation plant?
  1.    Vertical tube evaporator
  2.    Multistage flash evaporator
  3.    Tube settler
  4.    Multi-effect multistage flash evaporator
 Discuss Question
Answer: Option C. -> Tube settler
Answer: (c).Tube settler

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