Practice Test: Question Set - 21
1. Higher yield may be expected from
- (A) Gravity
springs
- (B) Surface
springs
- (C) Artesian
springs
- (D) All
the above
2. Before constructing a dam, the factor to be considered for controlling sedimentation, is
- (A) Selection
of dam site
- (B) Construction
of check dams
- (C) Providing
vegetation screens
- (D) All
the above
3. Chlorination of water does not remove
- (A) Ammonia
content
- (B) B.O.D.
- (C) Organic
matter content
- (D) Dissolved
oxygen
4. While selecting the location of an intake for collecting surface water, the factor considered, is
- (A) The
intake point should be near as far as possible to the treatment plant
- (B) The
intake point should be in purer zone of the water source
- (C) The
intake point in meandering rivers should be on concave banks
- (D) All
the above
5. The diameter of pipes in bath rooms and lavatories in domestic water supply, is
- (A) 6 mm
- (B) 12 mm
- (C) 18 mm
- (D) 24 mm
6. Non-pathogenic bacterias cause the following water borne disease,
- (A) Cholera
- (B) Typhoid
- (C) Infections
hepatitis
- (D) None of
these
7. Underground water is obtained from
- (A) Rains
- (B) Rivers
- (C) Lakes
- (D) Springs
8. The ensure proper growth of children's teeth, the quantity of fluoride used in water mains, is
- (A) 1 mg/liter
- (B) 2 mg/liter
- (C) 3 mg/liter
- (D) 5 mg/liter
9. For a city developed haphazardly, the layout of distribution pipes preferred to, is
- (A) Ring
system
- (B) Radial
system
- (C) Grid
iron system
- (D) Dead
end system
10. Slow sand filter is used if maximum turbidity of raw water is less than
- (A) 10 gm/liter
- (B) 20 gm/liter
- (C) 30 gm/liter
- (D) 50 gm/liter
11. Raw water treated with only chlorine, is known as
- (A) Plain
chlorination
- (B) Pre-chlorination
- (C) First-chlorination
- (D) De-chlorination
12. Total flow in stream is known
- (A) Run off
- (B) Stream flow
- (C) Discharge
- (D) All the
above
13. Asbestos pipes are joined by means of
- (A) Flanged
joint
- (B) Flexible
joint
- (C) Dresser
coupling joint
- (D) Simplex
joint
14. 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
- (A) 1.21
- (B) 1.23
- (C) 1.25
- (D) 1.27
15. The valve fitted closely in a recess against an opening in a pipe, is generally
- (A) Wedge
shaped circular disc
- (B) Spherical
disc
- (C) Parallelepiped
disc
- (D) Conical
shaped circular disc
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