Water Supply Engineering

31. As per IS : 1172-1963, water required per head per day for average domestic purposes, is

  1. 50 litres
  2. 65 litres
  3. 85 litres
  4. 135 litres

Correct answer: (D)
135 litres

32. Asbestos pipes are

  1. Light in weight and easy to transport
  2. Highly resistant to corrosion
  3. High flexible to accommodate deflection upto 12°
  4. All the above

Correct answer: (D)
All the above

33. Asbestos pipes are joined by means of

  1. Flanged joint
  2. Flexible joint
  3. Dresser coupling joint
  4. Simplex joint

Correct answer: (D)
Simplex joint

34. At break point of chlorination,

  1. Chlorine is used to oxidise
  2. Residual chloride is zero
  3. Residual chloride is maximum
  4. Residual chlorine reappears

Correct answer: (D)
Residual chlorine reappears

35. At the socket and spigot joint,

  1. Enlarged end of the pipe is called socket
  2. Normal end of the pipe is called spigot
  3. Spigot is fitted into the socket
  4. All the above

Correct answer: (D)
All the above

36. Average annual rainfall at any station is the average of annual rainfall over a period of

  1. 7 years
  2. 14 years
  3. 28 years
  4. 35 years

Correct answer: (D)
35 years

37. B.O.D. of treated water should be

  1. 10 ppm
  2. 25 ppm
  3. 20 ppm
  4. Nil

Correct answer: (D)
Nil

38. Bacterias which can survive with or without free oxygen, are known

  1. Aerobic bacterias
  2. Anaerobic bacterias
  3. Facultative bacterias
  4. None of these

Correct answer: (C)
Facultative bacterias

39. Before constructing a dam, the factor to be considered for controlling sedimentation, is

  1. Selection of dam site
  2. Construction of check dams
  3. Providing vegetation screens
  4. All the above

Correct answer: (D)
All the above

40. Biochemical Oxygen Demand (B.O.D.) of safe drinking water must be

  1. Nil
  2. 5
  3. 10
  4. 15

Correct answer: (A)
Nil

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