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  • Question
  • The population of a city in 2000 is 50, 000. The average per decade of the previous records of population is 5000 and average percentage per decade is 20%. The population of the city based on geometrical increase method, in the year 2020 will be


  • Options
  • A. 56, 000
  • B. 60, 000
  • C. 64, 000
  • D. 70, 000
  • E. 72, 000

  • Correct Answer
  • 72, 000 


  • Water Supply Engineering problems


    Search Results


    • 1. The detention period for plain sedimentation water tanks, is usually

    • Options
    • A. 4 to 8 hours
    • B. 8 to 16 hours
    • C. 16 to 24 hours
    • D. 24 to 36 hours.
    • Discuss
    • 2. The depth of the water table at a place is 45 m below the general ground level. To lift water from a deep tube well in such a locality, the type of pump to be installed is

    • Options
    • A. Centrifugal pump
    • B. Reciprocating pump
    • C. Deep well turbine pump
    • D. None of these.
    • Discuss
    • 3. The bacterias which require free oxygen for their survival, are called

    • Options
    • A. Aerobic bacterias
    • B. Anaerobic bacterias
    • C. Faculative bacteria
    • D. None of these.
    • Discuss
    • 4. For estimating the run off of catchments, the mean value of the constant 'K' in the Khosla's formula Qy = Py - K (1.8 Ty + 32) is

    • Options
    • A. 1.21
    • B. 1.23
    • C. 1.25
    • D. 1.27
    • E. 1.31
    • Discuss
    • 5. Pick up the correct statement from the following :

    • Options
    • A. Lime may be used to soften the hard water
    • B. Excessive use of lime may kill the bacterias
    • C. Excessive lime when added to water, raises its pH value
    • D. When lime raises pH value of water to about 9.5, 100% bacterias are removed
    • E. All the above.
    • Discuss
    • 6. 45 litres of water per person per day, is provided in

    • Options
    • A. office buildings
    • B. hotels
    • C. hostels
    • D. nurse's homes.
    • Discuss
    • 7. For plain chlorination of water, the quantity of chlorine used, is

    • Options
    • A. 0.1 mg/litre
    • B. 0.2 mg/litre
    • C. 0.3 mg/litre
    • D. 0.4 mg/litre
    • E. 0.5 mg/litre.
    • Discuss
    • 8. The ratio of maximum hourly consumption and average hourly consumption of the maximum day, is

    • Options
    • A. 1.2
    • B. 1.5
    • C. 1.8
    • D. 2.4
    • E. 2.7
    • Discuss
    • 9. The valves provided at low points of pipes to drain off water quickly under gravity, are called

    • Options
    • A. blow off valves
    • B. drain valves
    • C. sewer valves
    • D. all the above.
    • Discuss
    • 10. The efficiency of sedimentation tank does not depend upon

    • Options
    • A. depth of tank
    • B. length of tank
    • C. detention period
    • D. velocity of water.
    • Discuss


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