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MCQs

Total Questions : 828 | Page 7 of 83 pages
Question 61. If the coli form bacteria is present in a sample of water, then the coli-form test to be conducted is (i) Presumptive coli-form test (ii) Confirmed coli-form test (iii) Completed coli-form test
  1.    Only (i)
  2.    Both (i) and (ii)
  3.    Both (i) and (iii)
  4.    All (i), (ii) and (iii)
 Discuss Question
Answer: Option D. -> All (i), (ii) and (iii)
Question 62. Percentage of bacterial load that can be removed from water by the process of plain sedimentation is about
  1.    10 to 25
  2.    50
  3.    75
  4.    100
 Discuss Question
Answer: Option C. -> 75
Question 63. The type of sewer which is suitable for both combined and separate system is
  1.    Circular sewer
  2.    Egg shaped sewer
  3.    Horseshoe type sewer
  4.    Semi-elliptical sewer
 Discuss Question
Answer: Option B. -> Egg shaped sewer
Question 64. Which of the following is not a water borne disease?
  1.    Dysentery
  2.    Cholera
  3.    Typhoid
  4.    Malaria
 Discuss Question
Answer: Option D. -> Malaria
Question 65. The type of valve which allows water to flow in one direction but prevents its flow in the reverse direction is
  1.    Reflux valve
  2.    Sluice valve
  3.    Air relief valve
  4.    Pressure relief valve
 Discuss Question
Answer: Option A. -> Reflux valve
Question 66. The rate of Alteration of pressure filters is
  1.    Less than that of slow sand filters
  2.    In between the filtration rate of slow sand filters and rapid sand filters
  3.    Greater than that of rapid sand filters
  4.    Equal to that of slow sand filters
 Discuss Question
Answer: Option C. -> Greater than that of rapid sand filters
Question 67. A pipe which is installed in the house drainage to preserve the water seal of traps is called
  1.    Vent pipe
  2.    Anti-siphonage pipe
  3.    Waste pipe
  4.    Soil pipe
 Discuss Question
Answer: Option B. -> Anti-siphonage pipe
Question 68. Select the correct relationship between porosity (N), specific yield (y) and specific retention (R)
  1.    N = y + R
  2.    y = N + R
  3.    R = N + y
  4.    R > (N + y)
 Discuss Question
Answer: Option A. -> N = y + R
Question 69. The percentage of filtered water, which is used for backwashing in rapid sand filters, is about
  1.    0.2 to 0.4
  2.    0.4 to 1.0
  3.    2 to 4
  4.    5 to 7
 Discuss Question
Answer: Option C. -> 2 to 4
Question 70. The percentage of chlorine in fresh bleaching powder is about
  1.    10 to 15
  2.    20 to 25
  3.    30 to 35
  4.    40 to 50
 Discuss Question
Answer: Option C. -> 30 to 35

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