MCQ on Water Supply Engineering - Set 02 - ObjectiveBooks

# 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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