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  • Question
  • Hardness of water is caused by


  • Options
  • A. presence of soap lather
  • B. presence of chlorides and sulphates of sodium and potassium
  • C. presence of bicarbonates, sulphates or chlorides of calcium and magnesium
  • D. turbidity.

  • Correct Answer
  • presence of bicarbonates, sulphates or chlorides of calcium and magnesium 


  • Water Supply Engineering problems


    Search Results


    • 1. Gravity conduits

    • Options
    • A. carry water under gravity
    • B. follow the hydraulic gradient line
    • C. are carried on trestles in valleys and depressions
    • D. are carried through tunnels in deep cuttings
    • E. All the above.
    • Discuss
    • 2. A well is considered to be good if it is sunk into

    • Options
    • A. Clay
    • B. Sand
    • C. Coarse gravel
    • D. Silt.
    • Discuss
    • 3. Pick up the incorrect statement from the following :

    • Options
    • A. Water disinfected with ozone is free from any odour
    • B. Ozone removes bacterias as well as colour and odour
    • C. ozonised water becomes tasteless
    • D. None of these.
    • Discuss
    • 4. The formula Q = P - K[1.8T + 32] in which Q is runoff, P is annual rain fall in cm, T is mean annual temperature in centigrades and K is a constant, is known

    • Options
    • A. Justin's formula
    • B. Khosla's formula
    • C. English formula
    • D. Vermule's formula.
    • Discuss
    • 5. Well treated water is generally supplied for

    • Options
    • A. domestic use
    • B. commercial use
    • C. public use
    • D. waste water
    • E. all the above.
    • Discuss
    • 6. The ratio of the maximum daily consumption to the average daily demand, is

    • Options
    • A. 1.0
    • B. 1.2
    • C. 1.4
    • D. 1.6
    • E. 1.8
    • Discuss
    • 7. The process of passing water through beds of granular materials, is called

    • Options
    • A. screening
    • B. sedimentation
    • C. filtration
    • D. none of these.
    • Discuss
    • 8. If L, B and D length, breadth and depth of water in a rectangular sedimentation tank of total discharge Q, the settling velocity, is

    • Options
    • A.
    • B.
    • C.
    • D.
    • E.
    • Discuss
    • 9. If n is porosity, y is specific yield and r is specific retention of any soil, the relationship which holds good, is

    • Options
    • A. n + y + r = 1
    • B. n + y = r
    • C. n + r = y
    • D. y + r = n
    • E. n + r + y = 0
    • Discuss
    • 10. The ratio of total capacity and dead storage is kept

    • Options
    • A. 8
    • B. 6
    • C. 4
    • D. 3
    • E. 2
    • Discuss


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