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  • Question

  • By boiling water, hardness can be removed if it is due to


  • Options
  • A. calcium sulphate
  • B. magnesium sulphate
  • C. calcium nitrate
  • D. calcium bicarbonate
  • E. none of these.

  • Correct Answer
  • calcium bicarbonate 

    • Water Supply Engineering problems

    Search Results

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

    • Options
    • A. 50 litres
    • B. 65 litres
    • C. 85 litres
    • D. 105 litres
    • E. 135 litres.
      • Discuss
    • 2. Q is the discharge from an unconfined tube well with depression head s through its pipe of radius rw. If the radius of influence is R, the length of the required strainer, is

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 3. In slow sland filters, the turbidity of raw water can be removed only up to

    • Options
    • A. 60 mg/litre
    • B. 75 mg/litre
    • C. 100 gm/litre
    • D. 150 mg/litre.
      • Discuss
    • 4. P0, P1, P2 be the populations of a city at times t0, t1 and t2 = 2t1, the saturation value of the population Ps of the city, is

    • Options
    • A.
    • B.
    • C.
    • D.
    • E. None of these.
      • Discuss
    • 5. Time of concentration

    • Options
    • A. is the time taken, for precipitation
    • B. duration of rainfall.
    • C. time taken for all the ran off to reach the drain
    • D. time taken for the storm water to travel from the most remote point to the drain.
      • Discuss
    • 6. If four fires break out in a city of population 40 lakhs and if each hydrant has three streams and duration of each fire is four hours, the total quantity of water required, is

    • Options
    • A. 1880 kilo litres
    • B. 2880 kilo litres
    • C. 3880 kilo litres
    • D. 4880 kilo litres.
      • Discuss
    • 7. The specific retention is least in case of

    • Options
    • A. Clay
    • B. Sand
    • C. Silt
    • D. Coarse gravel.
      • Discuss
    • 8. B.O.D. of treated water should be

    • Options
    • A. 10 ppm
    • B. 25 ppm
    • C. 20 ppm
    • D. 30 ppm
    • E. Nil.
      • Discuss
    • 9. Acidity in water is caused due to

    • Options
    • A. Mineral acids
    • B. Free CO2
    • C. Iron sulphate
    • D. Aluminium sulphate
    • E. All the above.
      • Discuss
    • 10. Disinfection of drinking water, is done to remove

    • Options
    • A. odour
    • B. bacterias
    • C. turbidity
    • D. colour.
      • Discuss

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