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  • Question
  • The most ideal disinfectant used for drinking water throughout the world, is


  • Options
  • A. alum
  • B. lime
  • C. chlorine
  • D. nitrogen
  • E. ammonia.

  • Correct Answer
  • chlorine 


  • Water Supply Engineering problems


    Search Results


    • 1. Water is supplied from the source to the treatment plant under gravity in

    • Options
    • A. Calcutta
    • B. Delhi
    • C. Madras
    • D. Bombay.
    • Discuss
    • 2. Derivation of Thiem's formula
      is based on the assumption

    • Options
    • A. the aquifer is homogeneous, isotropic and of infinite depth and area
    • B. the well is sunk through the full depth of the aquifer
    • C. the flow lines are radial and horizontal, and the flow is laminar
    • D. for hydraulic gradient in Darcy's equation, tangent value is used for sine value
    • E. all the above.
    • Discuss
    • 3. In a reservoir the average volume of sediment deposition is 0.15 million cubic per year. If the dead storage and total capacity of the reservoir are 8 million cubic metres and 36 million cubic metres respectively,

    • Options
    • A. the reservoir will theoretically be silted in 240 years
    • B. the reservoir will start reducing after 60 years
    • C. both (a) and (b)
    • D. neither (a) nor (b).
    • Discuss
    • 4. The formula for the head loss in conduits is generally known as

    • Options
    • A. Hazen-William's formula
    • B. Manning's formula
    • C. Darcy-Weisbach formula
    • D. Nikuradse formula.
    • Discuss
    • 5. Disinfection of drinking water is done to remove

    • Options
    • A. turbidity
    • B. odour
    • C. colour
    • D. bacterias
    • E. all the above.
    • Discuss
    • 6. Pick up the correct statement from the following :

    • Options
    • A. Head loss in smaller size pipes at equal velocities, is less
    • B. Cost of pumping is less in smaller size pipes
    • C. Cost of smaller pipes is comparatively more
    • D. None of these.
    • Discuss
    • 7. Pick up the incorrect statement from the following. In take of water supply should

    • Options
    • A. be nearer to the treatment plant
    • B. receive water from purer zone of the source
    • C. be located downstream of waste water disposal point
    • D. remain easily accessible during floods.
    • Discuss
    • 8. Filtration of water is done to remove

    • Options
    • A. colour
    • B. odour
    • C. turbidity
    • D. pathogenic bacteria
    • E. all the above.
    • Discuss
    • 9. Permanent hardness of water can be removed by

    • Options
    • A. adding alum
    • B. adding lime
    • C. adding chlorine
    • D. boiling
    • E. zeolite process.
    • Discuss
    • 10. The U.C. (uniformity coefficient) for the best filter media sand should be

    • Options
    • A. 2
    • B. 3
    • C. 4
    • D. 5
    • E. none of these.
    • Discuss


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