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  • Question
  • For complete stabilisation of organic matter in polluted water, it takes


  • Options
  • A. 5 days
  • B. 10 days
  • C. 20 days
  • D. 30 days
  • E. 40 days.

  • Correct Answer
  • 30 days 


  • Water Supply Engineering problems


    Search Results


    • 1. Suction lift of a pump depends upon

    • Options
    • A. atmospheric pressure
    • B. water temperature
    • C. velocity of water in suction pipe
    • D. frictional losses
    • E. all the above.
    • Discuss
    • 2. For 3.25 x 10-2 cumecs discharging from a well, a pump is installed to lift water against a total head of 30 m. The minimum required horse power, is

    • Options
    • A. 10 H.P.
    • B. 15 H.P.
    • C. 18 H.P.
    • D. 20 H.P.
    • E. 25 H.P.
    • Discuss
    • 3. Low turbidity of water is detected by

    • Options
    • A. Turbidity tube
    • B. Jackson turbidity meter
    • C. Baylis turbidimeter
    • D. Hellipe turbidimeter
    • E. None of these.
    • Discuss
    • 4. At break point of chlorination,

    • Options
    • A. chlorine is used to oxidise
    • B. residual chloride is zero
    • C. residual chloride is maximum
    • D. residual chlorine reappears.
    • Discuss
    • 5. Pick up the correct statement from the following :

    • Options
    • A. Copper pipes are highly resistant to acidic and alkaline water
    • B. Wrought iron pipes are lighter than cast iron pipes
    • C. Wrought iron pipes corrode quickly and are less durable
    • D. Wrought iron pipes coated with zinc, are called galvanised iron pipes
    • E. All the above.
    • Discuss
    • 6. Capacity of soil to absorb moisture, is generally known as

    • Options
    • A. permeability
    • B. porosity
    • C. infiltration capacity
    • D. perviousness.
    • Discuss
    • 7. Pick up the correct statement from the following :

    • Options
    • A. The volume of underground water extracted by gravity drainage from a saturated soil, is known as yield
    • B. The ratio of volume drained to the total volume of material drained, is known as specific yield
    • C. The volume of water retained by the soil against the pull of gravity, is called specific retention or field capacity
    • D. The sum of specific yield and specific retention, is equal to porosity
    • E. All the above.
    • Discuss
    • 8. Silt storage is the same as

    • Options
    • A. dead storage
    • B. live storage
    • C. effective storage
    • D. none of these.
    • Discuss
    • 9. Perched acquifers generally occur

    • Options
    • A. below water table
    • B. above water table
    • C. in acquicludes
    • D. in artesian acquifers
    • E. none of these.
    • Discuss
    • 10. Pick up the incorrect statement from the following :

    • Options
    • A. The pH value of water indicates the logarithm of reciprocal of hydrogen ion concentration in water
    • B. Higher value of pH means lower hydrogen ion concentration
    • C. Lower value of pH means higher hydrogen ion contraction
    • D. Lower value of pH gives alkaline solution
    • E. None of these.
    • Discuss


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