Civil Water Supply Quiz Questions - Set 20 - ObjectiveBooks

Civil Water Supply Quiz Questions - Set 20

Practice Test: Question Set - 20

1. Abyssinian tube well is a special type of
    (A) Slotted type wells
    (B) Cavity type wells
    (C) Strainer type well
    (D) None of these

2. Surface water is obtained from
    (A) Well
    (B) Springs
    (C) Artesian well
    (D) Rain

3. The permissible amount of nitrites present in potable water, is
    (A) 10 ppm
    (B) 15 ppm
    (C) 45 ppm
    (D) Nil

4. Detention time for plain sedimentation tank usually ranges from
    (A) 2 to 4 hours
    (B) 4 to 8 hours
    (C) 6 to 10 hours
    (D) 8 to 12 hours

5. The order of existence of three portions of water in a reservoir from the bottom to top is
    (A) Useful storage + surcharge storage + dead storage
    (B) Useful storage + dead storage + surcharge storage
    (C) Dead storage + useful storage + surcharge storage
    (D) Surcharge storage + useful storage + dead storage

6. The maximum non-verticality of the bore of a well 200 m deep, may be permitted up to
    (A) 25 cm
    (B) 50 cm
    (C) 75 cm
    (D) 100 cm

7. Pick up the incorrect statement from the following:
    (A) Porosity of clay sand soil is 45%
    (B) Porosity of pure sand is 35%
    (C) Porosity of sand stone is up to 15%
    (D) None of these

8. Water may contain
    (A) Bicarbonate alkalinity
    (B) Carbonate alkalinity
    (C) Hydroxide alkalinity
    (D) All the above

9. The total domestic consumption in a city water supply, is assumed
    (A) 20 %
    (B) 30 %
    (C) 40 %
    (D) 60 %

10. Surface water may
    (A) Contain large amount of impurities
    (B) Be contaminated by impurities
    (C) Contain disease producing bacterias
    (D) All the above

11. The ratio of total capacity and dead storage is kept
    (A) 8
    (B) 6
    (C) 4
    (D) 3

12. The maximum permissible chloride content in treated water of public water supplies should not exceed
    (A) 50 P.P.M.
    (B) 100 P.P.M.
    (C) 150 P.P.M.
    (D) 250 P.P.M.

13. Most important source of water for public water supply, is from
    (A) Lakes
    (B) Ponds
    (C) Streams
    (D) Rivers

14. Air inlet valve in water mains, is generally provided at
    (A) Summit of the pipe
    (B) Upstream of sluice valve
    (C) Downstream of sluice valve
    (D) Both (a) and (c) of above

15. To detect the turbidity of the order of 0 to 1000 P.P.M. the instrument used is
    (A) Turbidimeter
    (B) Jackson turbidimeter
    (C) Baylis turbidimeter
    (D) Hellige turbidimeter

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