Water Supply Civil Engineering Questions Answers - Set 07 - ObjectiveBooks

# 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
(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

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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