Practice Test: Question Set - 13
1. Silt storage is the same as
- (A) Dead
storage
- (B) Live
storage
- (C) Effective
storage
- (D) None
of these
2. According to Kuichling’s formula, fire demand in litres per minute for a population of P thousands, is
- (A) 3182 √P
- (B) 1136.5 (P/10 + 10)
- (C) 4637 √P [1
- 0.01 √P]
- (D) 5663 √P
3. The type of pipe commonly used in water supply distribution schemes, is
- (A) R.C.C. pipes
- (B) Hume
pipes
- (C) Cast
iron pipes
- (D) G.I.
pipes
4. Pick up the incorrect statement from the following. The source of surface water is from
- (A) Streams
and rivers
- (B) Storage
reservoirs
- (C) Springs
- (D) Ponds
and lakes
5. Water supply includes
- (A) Collection,
transportation and treatment of water
- (B) Distribution
of water to consumers
- (C) Provision
of hydrants for fire fighting
- (D) All
the above
6. The discharge Q = 2π KHS/2.3 log10 (R/rw) for the confined tube well is obtained from
- (A) Thiem's
formula
- (B) Darcy's
formula
- (C) Tolman's
formula
- (D) Dupuits
formula
7. m and n are monsoon duration factor and catchment factor respectively. If P is yearly rainfall in cm, runoff can be calculated by
- (A) Velocity
area method
- (B) Weir
or spillway method
- (C) Use
of venturi-meter
- (D) Using
power plant consumption
8. Acidity in water is caused due to
- (A) Mineral
acids
- (B) Free CO2
- (C) Iron
sulphate
- (D) All
the above
9. The cast iron pipes for water supply system are used for
- (A) Durability
- (B) Strength
- (C) Easy
connection
- (D) All
the above
10. In a rapid gravity filter
- (A) Raw
water from the source is supplied
- (B) Disinfected
raw water is supplied
- (C) Raw
water passed through coagulation tank is supplied
- (D) None
of these
11. The maximum permissible nitrites in public water supplies, is
- (A) Nil
- (B) 0.5 P.P.M.
- (C) 1.0. P.P.M.
- (D) 1.5 P.P.M.
12. Most commonly used section in grade aqueducts, is
- (A) Circular
- (B) Rectangular
- (C) Parabolic
- (D) Horse
shoe section
13. The most important and widely used tube well in India, is
- (A) Strainer
well
- (B) Cavity well
- (C) Slotted well
- (D) Perforated
pipe well
14. The R.L. of ground water table on the sides of a valley is 1505 m whereas R.L. of the stream water is 1475 m. If 60° slope consists of pervious soil between R.L. 1485 m to 1500 m, the gravity spring may be expected at the point of reduced level
- (A) 1500 m
- (B) 1505 m
- (C) 1475 m
- (D) 1485 m
15. Critical time for developing a water hammer, is the time required for
- (A) Closing
the valve
- (B) The
wave to travel from valve to the reservoir
- (C) The
wave to travel from the valve to the reservoir and back
- (D) None
of these
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