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  • Question

  • Hardness of water is caused due to


  • Options
  • A. calcium sulphate
  • B. magnesium sulphate
  • C. calcium nitrates
  • D. calcium bicarbonates
  • E. all the above.

  • Correct Answer
  • all the above. 

    • Water Supply Engineering problems

    Search Results

    • 1. After cleaning a slow sand filter, the filtered water is not used for

    • Options
    • A. 6 hours to 12 hours
    • B. 12 hours to 18 hours
    • C. 18 hours to 24 hours
    • D. 24 hours to 36 hours
    • E. 48 hours.
      • Discuss
    • 2. Hard water contains

    • Options
    • A. calcium
    • B. magnesium bicarbonates
    • C. magnesium sulphate
    • D. all the above.
      • Discuss
    • 3. If p is total internal pressure, d is diameter of pressure conduit and t is thickness of conduit, the Hoop's stress is

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 4. Mostly used coagulant, is

    • Options
    • A. chlorine
    • B. alum
    • C. lime
    • D. bleaching powder.
      • Discuss
    • 5. One degree of hardness of water means a content of salts of

    • Options
    • A. 10.25 mg/litre
    • B. 12.25 mg/litre
    • C. 14.25 mg/litre
    • D. 16.25 mg/litre.
    • E. 20 mg/litre.
      • Discuss
    • 6. Gravity conduits for carrying water from the source are

    • Options
    • A. canals
    • B. flumes
    • C. acqueducts
    • D. all the above.
      • Discuss
    • 7. During treatment of water, sedimentation is done

    • Options
    • A. before filtration
    • B. after filtration
    • C. simultaneously with filtration
    • D. along with chlorination.
      • Discuss
    • 8. Percussion drilling is unsuitable in

    • Options
    • A. unconsolidated sand
    • B. unconsolidated gravel
    • C. quick sand
    • D. consolidated rocks.
      • Discuss
    • 9. While determining the yield of open wells by the pumping test

    • Options
    • A. velocity of recharging water, increases with depression head
    • B. depression head resulting at critical velocity, is called critical depression head
    • C. working head is generally limited to rd of the critical depression head
    • D. maximum safe yield of an open well, is expected at critical depression head.
      • Discuss
    • 10. The maximum hourly consumption, is generally taken as

    • Options
    • A. 110%
    • B. 120%
    • C. 130%
    • D. 140%
    • E. 150%.
      • Discuss

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