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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