Practice Test: Question Set - 02
1. To control the growth of algae in reservoirs, the compound which is used, is
- (A) Bleaching
powder
- (B) Copper
sulphate
- (C) Lime
solution
- (D) Alum
solution
2. The population of a city in 2000 is 50,000. The average increase in population over last 8 decades is 7500 and average incremental increase during 8 decades is 750. The population of the city based on incremental method, in the year 2020 will be
- (A) 55,000
- (B) 60,500
- (C) 66,500
- (D) 72,500
3. A pressure conduit laid underground, may not be subjected to
- (A) Internal
pressure of water
- (B) Pressure
due to external load
- (C) Longitudinal
temperature stress
- (D) Longitudinal
stresses due to unbalanced pressure to bends
4. The bacterias which require free oxygen for their survival, are called
- (A) Aerobic
bacterias
- (B) Anaerobic
bacterias
- (C) Facultative
bacteria
- (D) None
of these
5. Gravity conduits are generally in the form of
- (A) Canals
- (B) Flumes
- (C) Aqueduct
- (D) All
the above
6. The main disadvantage of hard water, is
- (A) Greater
soap consumption
- (B) Scaling
of boilers
- (C) Corrosion
and incrustation of pipes
- (D) All
the above
7. The formula Q = P - K [1.8T + 32] in which Q is runoff, P is annual rain fall in cm, T is mean annual temperature in centigrade and K is a constant, is known
- (A) Justin's
formula
- (B) Khosla's
formula
- (C) English
formula
- (D) Vermule's
formula
8. The bed slope in slow sand filters, is generally kept
- (A) 1 in 50
- (B) 1 in 75
- (C) 1 in 100
- (D) 1 : 200
9. The water level in an open well was depressed by pumping 2.5 m and recuperated 2.87 m in 3 hours and 50 minutes. The yield of the well per minute is
- (A) 0.0033
- (B) 0.0044
- (C) 0.0055
- (D) 0.0066
10. Perched aquifers are generally found
- (A) On the
surface of the ground
- (B) Below the
surface of the ground but above water table
- (C) Below
the water table
- (D) All
the above
11. Pick up the incorrect statement from the following:
- (A) The pH value
of water indicates the logarithm of reciprocal of hydrogen ion concentration in
water
- (B) Higher
value of pH means lower hydrogen ion concentration
- (C) Lower
value of pH means higher hydrogen ion contraction
- (D) Lower
value of pH gives alkaline solution
12. Mostly used coagulant, is
- (A) Chlorine
- (B) Alum
- (C) Lime
- (D) Bleaching
powder
13. A centrifugal pump is required to be primed before starting if it is located
- (A) At
higher level than water level of reservoir
- (B) At
lower level than water level of reservoir
- (C) Both (a) and
(b)
- (D) Neither (a)
nor (b)
14. Suction lift of a pump depends upon
- (A) Atmospheric
pressure
- (B) Water
temperature
- (C) Velocity
of water in suction pipe
- (D) All
the above
15. Normal values of overflow rate for plain sedimentation tank, is
- (A) 250 to 500
liters/hr/m2
- (B) 500 to 750
liters/hr/m2
- (C) 750 to 1000
liters/hr/m2
- (D) 1000 to 1250
liters/hr/m2
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