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MCQs

Total Questions : 91 | Page 7 of 10 pages
Question 61. . Inhibitors are used along with sanitizer to
  1.    improve their action
  2.    to prevent corrosion
  3.    both (a) and (b)
  4.    none of these
 Discuss Question
Answer: Option B. -> to prevent corrosion
Question 62. . 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
Question 63. . Which of the following substances are commonly used in a filter?
  1.    Charcoal
  2.    Sand
  3.    Both (a) and (b)
  4.    Aluminum chloride
 Discuss Question
Answer: Option C. -> Both (a) and (b)
Question 64. .  Biological oxidation processes usually referred as biological treatment, are the most common form of
  1.    primary treatment
  2.    secondary treatment
  3.    tertiary treatment
  4.    all of these
 Discuss Question
Answer: Option B. -> secondary treatment
Question 65. . The maximum permissible limit (BIS) of turbidity in drinking water is
  1.    5 NTU
  2.    10 NTU
  3.    15 NTU
  4.    20 NTU
 Discuss Question
Answer: Option B. -> 10 NTU
Question 66. . Sedimentation is a physical process used in wastewater treatment to
  1.    remove particles that are less dense than water
  2.    remove particles that are more dense than water
  3.    remove the pertinacious material from the water
  4.    none of the above
 Discuss Question
Answer: Option B. -> remove particles that are more dense than water
Question 67. .  The ultimate source of water is
  1.    rivers and lakes
  2.    dew and forest
  3.    rain and snow
  4.    underground and surface
 Discuss Question
Answer: Option C. -> rain and snow
Question 68. . Permanent hardness of water may be removed by the addition of
  1.    lime
  2.    soda ash
  3.    potassium permagnate
  4.    sodium bicarbonate
 Discuss Question
Answer: Option B. -> soda ash
Question 69. . Both temporary and permanent hardness of water can be removed on boiling water with
  1.    calcium hydroxide
  2.    sodium carbonate
  3.    calcium oxide
  4.    calcium carbonate
 Discuss Question
Answer: Option B. -> sodium carbonate
Question 70. . Lagoons may be characterized as
  1.    anaerobic
  2.    facultative
  3.    aerated
  4.    all of these
 Discuss Question
Answer: Option D. -> all of these

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