Practice Test: Question Set - 18
1. Capacity of soil to absorb moisture, is generally known as
- (A) Permeability
- (B) Porosity
- (C) Infiltration
capacity
- (D) Perviousness
2. Average annual rainfall at any station is the average of annual rainfall over a period of
- (A) 7
years
- (B) 14 years
- (C) 28 years
- (D) 35 years
3. If Q is discharge is cubic meters per sec and D is the economical diameter of the pipe. According to Lea
- (A) D =
0.67 to 0.87 √Q
- (B) D =
0.77 to 0.97 √Q
- (C) D =
0.97 to 1.22 √Q
- (D) D =
1.22 to 1.33 √Q
4. The flow of water gets retarded, in
- (A) Settling
tank
- (B) Sedimentation
tank
- (C) Clarifier
- (D) All
the above
5. At the socket and spigot joint,
- (A) Enlarged
end of the pipe is called socket
- (B) Normal
end of the pipe is called spigot
- (C) Spigot
is fitted into the socket
- (D) All the
above
6. Yield of a drainage basin is:
- (A) Run
off of the area expressed as instantaneous rate
- (B) Average
run off over a short period
- (C) Total volume
of water flowing annually
- (D) All the
above
7. Disappearance of pink color of water of a well due of KMnO4 indicates that water contains
- (A) Acidity
- (B) Alkalinity
- (C) Turbidity
- (D) Organic
matter
8. The specific retention is least in case of
- (A) Clay
- (B) Sand
- (C) Silt
- (D) Coarse
gravel
9. If w is the weight of water per cubic metre, Q is the discharge in cubic meters per sec and H is the total head, the required water horse power of the pump, is
- (A) wQH/15
- (B) wQH/360
- (C) wQH/220
- (D) wQH/550
10. Pipes are laid parallel
- (A) To
increase the capacity of the water supply
- (B) To
provide a means of repairing without closing water supply
- (C) To
meet the requirement of excessive supply
- (D) All the
above
11. The factor affecting per capita demand, is
- (A) Size of the
city
- (B) Climatic
conditions
- (C) Pressure
in water mains
- (D) All the
above
12. Filtration of water is done to remove
- (A) Color
- (B) Odour
- (C) Turbidity
- (D) Pathogenic
bacteria
13. An ideal sand for filters should be
- (A) Free
from dirt and other impurities
- (B) Uniform
in nature and size
- (C) Hard
and resistant
- (D) All
the above
14. Hardness of water is caused due to
- (A) Calcium
sulphate
- (B) Magnesium
sulphate
- (C) Calcium
nitrates
- (D) All
the above
15. Normal values of overflow rate for sedimentation tanks using coagulants in litres/hr/m2, generally range between
- (A) 250 to 500
- (B) 500 to 750
- (C) 750 to 1000
- (D) 1000 to 1250
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