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  • Question
  • The diameter of pipes in bath rooms and lavatories in domestic water supply, is


  • Options
  • A. 6 mm
  • B. 12 mm
  • C. 18 mm
  • D. 24 mm.

  • Correct Answer
  • 12 mm 


  • Water Supply Engineering problems


    Search Results


    • 1. Run off is the quantity of water which flows

    • Options
    • A. in sewer pipes
    • B. due to leakage in pipes
    • C. in rivers
    • D. none of these.
    • Discuss
    • 2. For controlling algae, the most commonly used chemical, is

    • Options
    • A. copper sulphate
    • B. alum
    • C. lime
    • D. bleaching powder.
    • Discuss
    • 3. Raw water treated with only chlorine, is known as

    • Options
    • A. plain chlorination
    • B. pre-chlorination
    • C. first-chlorination
    • D. de-chlorination
    • E. none of these.
    • Discuss
    • 4. By adding 1 ml of orthotolidine solution to 100 ml chlorinated water taken after contact period, the residual chlorine makes the colour of solution

    • Options
    • A. yellowish
    • B. greenish
    • C. bluish
    • D. reddish
    • E. violet.
    • Discuss
    • 5. The percentage of chlorine in fresh bleaching powder is roughly

    • Options
    • A. 50 to 60
    • B. 30 to 35
    • C. 40 to 50
    • D. 20 to 25
    • Discuss
    • 6. The bed slope in slow sand filters, is generally kept

    • Options
    • A. 1 in 50
    • B. 1 in 75
    • C. 1 in 100
    • D. 1 : 200
    • Discuss
    • 7. In plain sedimentation tanks under normal conditions, impurities are removed upto

    • Options
    • A. 60%
    • B. 70%
    • C. 80%
    • D. 90%.
    • Discuss
    • 8. The population of a city in 2000 is 50,000. The average increase in population over last 8 decades is 7500 and average incremental increase during 8 decades is 750. The population of the city based on incremental method, in the year 2020 will be

    • Options
    • A. 55,000
    • B. 60,500
    • C. 66,500
    • D. 72,500
    • E. 76,500
    • Discuss
    • 9. Air inlet valve in water mains, is generally provided at

    • Options
    • A. summit of the pipe
    • B. upstream of sluice valve
    • C. down stream of sluice valve
    • D. valley of the pipe
    • E. both (a) and (c) of above.
    • Discuss
    • 10. Pick up the incorrect statement from the following :

    • Options
    • A. Iron salts produce heavy flocs and hence remove more suspended matter
    • B. Iron salts remove hydrogen sulphides
    • C. Iron salts can be used over a limited range of pH values
    • D. Iron salts impart corrosiveness to water.
    • Discuss


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