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MCQs

Total Questions : 824 | Page 7 of 83 pages
Question 61. Disinfection of water with ozone is not good because
  1.    it vanishes before water reaches the consumers
  2.    it removes the colour, taste and odour from water as bacterias
  3.    it adds taste to the water
  4.    it is more efficient than chlorine in killing bacterias
 Discuss Question
Answer: Option D. -> it is more efficient than chlorine in killing bacterias
Answer: (d).it is more efficient than chlorine in killing bacterias
Question 62. Maximum threshold number permitted for indicating the odour of public water supplies, is
  1.    1
  2.    2
  3.    3
  4.    4
 Discuss Question
Answer: Option C. -> 3
Answer: (c).3
Question 63. Turbidity of water may be caused due to
  1.    Suspended clay
  2.    Suspended silt
  3.    finely divided organic material
  4.    all the above.
 Discuss Question
Answer: Option D. -> all the above.
Answer: (d).all the above.
Question 64. 45 litres of water per person per day, is provided in
  1.    office buildings
  2.    hotels
  3.    hostels
  4.    nurse's homes.
 Discuss Question
Answer: Option A. -> office buildings
Answer: (a).office buildings
Question 65. Pick up the correct statement from the following :
  1.    Water with hardness upto 75 ppm is considered soft
  2.    Water with hardness more than 200 ppm is considered hard
  3.    Water needed for laundaries should contain hardness less than 75 ppm
  4.    All the above.
 Discuss Question
Answer: Option D. -> All the above.
Answer: (d).All the above.
Question 66. The maximum pressure to which cast iron pipes may be subjected to, is
  1.    3 kg/cm²
  2.    5 kg/cm²
  3.    7 kg/cm²
  4.    10 kg/cm².
 Discuss Question
Answer: Option C. -> 7 kg/cm²
Answer: (c).7 kg/cm²
Question 67. The maximum permitted loss of head in a rapid sand filter, is
  1.    1 m
  2.    2 m
  3.    3 m
  4.    4 m
 Discuss Question
Answer: Option C. -> 3 m
Answer: (c).3 m
Question 68. The permissible pH value for public water supplies may range between
  1.    4.5 to 5.5
  2.    5.5 to 6.5
  3.    6.5 to 8.5
  4.    8.5 to 10.5
 Discuss Question
Answer: Option C. -> 6.5 to 8.5
Answer: (c).6.5 to 8.5
Question 69. In pumping stations, the type of joint generally used, is
  1.    socket and spigot joint
  2.    flanged joint
  3.    expansion joint
  4.    dresser coupling joint
 Discuss Question
Answer: Option B. -> flanged joint
Answer: (b).flanged joint
Question 70. The strainer type tube well, is unsuitable for
  1.    coarse gravels
  2.    fine sandy strata
  3.    clean gravels
  4.    none of these.
 Discuss Question
Answer: Option B. -> fine sandy strata
Answer: (b).fine sandy strata

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