Practice Test: Question Set - 07
1. Generally, first portion of a logistic curve for the population growth of a developing city, represents the growth of
- (A) Increasing
- (B) Decreasing
- (C) Constant
- (D) All the
above
2. A pressure conduit carrying water beneath a stream or a canal, is known as
- (A) Sag
- (B) Depressed
pipe
- (C) Inverted
syphon
- (D) All
the above
3. Most satisfactory formula for an estimate of fire demand Q for a city of population P in thousands for Indian conditions, is
- (A) Q =
1115 (p/5 + 20)
- (B) Q =
1640 √P (1 - 0.01 √P)
- (C) Q =
3180 √P
- (D) None of
these
4. Permanent hardness of water can be removed by
- (A) Adding alum
- (B) Adding lime
- (C) Adding
chlorine
- (D) Zeolite process
5. Pick up the correct statement from the following:
- (A) If ports are
closed, the dry intake towers will not have any water
- (B) Even if
ports are closed, the wet intake tower will have water filled up to reservoir
level
- (C) No buoyant
force acts on wet intake towers
- (D) All the
above
6. The maximum depth of sedimentation tanks is limited to
- (A) 2 m
- (B) 3 m
- (C) 5 m
- (D) 6 m
7. Pick up the incorrect statement from the following. Intake of water supply should
- (A) Be nearer to
the treatment plant
- (B) Receive
water from purer zone of the source
- (C) Be located
downstream of waste water disposal point
- (D) Remain easily
accessible during floods
8. Pick up the correct statement from the following:
- (A) The
precipitation during its travel in atmosphere dissolves certain gases
- (B) Rain water
which percolates through the ground, is free from suspended materials
- (C) Underground
water may dissolve minerals and salts present in the earth's layers
- (D) All the
above
9. The fire demand of a city may be worked out by
- (A) Kuichling's
formula
- (B) Freeman
formula
- (C) Under
Writers formula
- (D) All the
above
10. The formula HL = n²V²L/R4/3 for the head loss in conduits is generally known as
- (A) Hazen-William's
formula
- (B) Manning's
formula
- (C) Darcy-Weisbach
formula
- (D) Nikuradse
formula
11. The joint used for joining the plain ends of cast iron pipes, is
- (A) Flanged
joint
- (B) Socket and
spigot joint
- (C) Dresser
coupling joint
- (D) Flexible
joint
12. Disinfection of water with ozone is not good because
- (A) It vanishes
before water reaches the consumers
- (B) It removes
the color, taste and odour from water as bacterias
- (C) It adds
taste to the water
- (D) It is more
efficient than chlorine in killing bacterias
13. The prescribed hardness limit of potable water ranges between
- (A) 50 to 75
P.P.M.
- (B) 75 to 115
P.P.M.
- (C) 100 to 150
P.P.M.
- (D) 150 to 200
P.P.M.
14. While designing a water supply of an industrial township, industrial and commercial water demand of total supply, is assumed
- (A) 10 %
- (B) 10 to 15 %
- (C) 15 to 20 %
- (D) 20 to 25 %
15. After cleaning a slow sand filter, the filtered water is not used for
- (A) 6 hours to
12 hours
- (B) 12 hours to
18 hours
- (C) 18 hours to
24 hours
- (D) 24 hours to 36
hours
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