Water Supply Engineering Questions (W1)

In this post, I will share some important questions which are frequently asked in competitive examinations such as SSC, UPSC and state PSCs.





  1. Per Capita water demand is the average value over a period of ...


    1. 1 day
    2. 1 week
    3. 1 month
    4. 1 year

    View Answer
    Answer: d

  2. Which of the following practices causes a reduction in the per capita water consumption?


    1. Hotter Climate
    2. Modern Life
    3. Metered connection
    4. Good quality of water

    View Answer
    Answer: c

  3. As per IS 1172-1993, what is the minimum domestic water consumption for town and cities with full flushing system?


    1. 200 L/H/D
    2. 155 L/H/D
    3. 135 L/H/D
    4. 100 L/H/D

    View Answer
    Answer: a

  4. As per IS 1172-1993, what is the minimum domestic water consumption for small Indian town and cities?


    1. 200 L/H/D
    2. 155 L/H/D
    3. 135 L/H/D
    4. 100 L/H/D

    View Answer
    Answer: c

  5. Which of the following industries required a maximum quantity of water to produce one unit?


    1. Automobiles
    2. Paper
    3. Fertilizer
    4. Sugar

    View Answer
    Answer: b

    S No. Name of the Industry
    Unit of production
    or raw material used
    Approx.Quantity of
    water required per
    unit of production/
    raw material in KL
    1 Automobiles Vehicles 40
    2 Distillery (Alcohol) KL 122-170
    3 Fertilizer Tonne 80-200
    4 Leather (Tanned) Tonne 40
    5 Paper Tonne 200-400
    6 Special Quality Paper Tonne 400-1000
    7 Straw board Tonne 75-100
    8 Petroleum Refinery Tonne (Crude) 1-2
    9 Steel Tonne 200-250
    10 Sugar Tonne (Crude cane) 1-2
    11 Textile Tonne (Goods) 80-140

  6. The total water demand of a city is generally assessed on the basis of:


    1. maximum hourly demand
    2. maximum hourly demand + fire demand
    3. average daily demand + fire demand
    4. greater of (a) and (b)

    View Answer
    Answer: d

  7. What is the ratio of maximum daily demand and annual average daily demand?


    1. 1.5
    2. 1.8
    3. 2.0
    4. 2.7

    View Answer
    Answer: b

  8. What if the ratio between maximum hourly consumption and average hourly demand?


    1. 2.7
    2. 2.4
    3. 1.8
    4. 1.5

    View Answer
    Answer: d

  9. What is the ratio between maximum hourly consumption and annual average hourly demand?


    1. 1.5
    2. 1.8
    3. 2.4
    4. 2.7

    View Answer
    Answer: d

  10. Coincident draft in relation to water demand is based on:


    1. peak hourly demand
    2. maximum daily demand
    3. maximum daily demand + fire demand
    4. greater of (a) and (c)

    View Answer
    Answer: c

  11. The distribution system in water supplies is designed on the basis of:


    1. average daily demand
    2. peak hourly demand
    3. coincident draft
    4. greater of (b) and (c)

    View Answer
    Answer: d

  12. If the population of a city is 1.5 Lakh, and the average water consumption is 200 lpd, then the capacity of the pipe mains, should be:


    1. 54 MLD
    2. 45 MLD
    3. 81 MLD
    4. 72 MLD

    View Answer
    Answer: a
    Since average water consumption is given,
    $1.8 \times 200 \times 150000 = 54000000 LD = 54 MLD$

  13. If the average water consumption of a city is 300 LPCD and its population is 4 lakh, the maximum hourly draft of the maximum day will be:


    1. 120 MLD
    2. 216 MLD
    3. 324 MLD
    4. none of the above

    View Answer
    Answer: c
    Maximum hourly draft $=2.7 \times 300 \times 400000 = 324 MLD$

  14. The pipe mains carrying water from the source to the reservoir are designed for the:


    1. maximum daily draft
    2. average daily draft
    3. maximum hourly draft of the maximum day
    4. maximum weekly draft

    View Answer
    Answer: a

  15. Water losses in the water supply system are assumed as:


    1. 5 %
    2. 7.5 %
    3. 15 %
    4. 25 %

    View Answer
    Answer: c




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