Civil engineering MCQ and water supply engineering MCQ for competitive exam.
Q. 1 Corrosion of well pipes may not be reduced by
A. Reducing the flow velocity
B. Using thicker pipes
C. Reducing the draw down and the pumping rate
D. Using screens having larger area of openings
D. Using screens having larger area of openings
Q. 2 Recuperation test is carried out to determine
A. Discharge from a well
B. Turbidity of water
C. pH value of water
D. Yield of well
B. Turbidity of water
Q. 3 Pick up the correct statement from the following:
A. Deposition of sediment in the reservoir, reduces the capacity of the reservoir
B. Large solids carried along the river bed, is known as bed load
C. The fine sediment deposits are generally near the face of the dam
D. All the above
D. All the above
Q. 4 Pick up the incorrect statement from the following. The underground sources of water, is from
A. Infiltration wells
B. Wells
C. Springs
D. Storage reservoirs
D. Storage reservoirs
Q. 5 Pick up the correct statement from the following:
A. Waste water and leakage is 15% of total consumption
B. Domestic use of water is 50% of total consumption
C. Average consumption of commercial use of water is 25% of total consumption
D. All the above
D. All the above
Q. 6 Most important method for calculating discharge for planning a water supply project, is
A. Using power plant consumption
B. Velocity area method
C. Weir or spillway method
D. Use of venturi-meter
B. Velocity area method
Q. 7 Pick up the correct statement from the following:
In pressure pipes with water at rest, the pressure is equal to water head
B. Sudden closure of a valve, causes the water hammer pressure
C. The internal pressure within a pipe, is caused due to water head and hammer pressure
D. All the above
D. All the above
Q. 8 Pickup the incorrect statement from the following:
A. Aqueducts and tunnels sections are generally kept circular
B. The invert of pressure conduit is independent of the grade of the hydraulic gradient line
C. The pressure conduits may be taken uphill upto a maximum height of 8.3 m
D. None of these
D. None of these
Q. 9 Pick up the correct statement from the following:
A. Small capacity reservoirs on large rivers generally, silt less
B. Large capacity reservoirs on small rivers generally silt more
C. The ratio of the total sediment deposited in the reservoir to the total sediment flowing in the river, is called trap efficiency
D. All the above
D. All the above
Q. 10Gravity conduits for carrying water from the source are
A. Aqueducts
B. Canals
C. Flumes
D. All the above
D. All the above
Q. 11 In a rapid sand filter, air binding is caused due to excessive
A. Turbidity
B. Negative pressure
C. Pressure
D. Water pressure
B. Negative pressure
Q. 12 According to Godrich the ratio of peak demand rate to mean demand is
A. Max. half yearly demand/Average half yearly demand = 107%
B. Max. weekly demand/Average weekly demand = 148%
C. Max. monthly demand/Average monthly demand = 128%
D. All the above
D. All the above
Q. 13 The best quality of filter material is obtained from quartzite if it does not loose weight when placed in hydrochloric acid for 24 hours, more than
A. 12 %
B. 5 %
C. 8 %
D. 10 %
B. 5 %
Q. 14 Pick up the incorrect statement from the following:
A. The yearly run off in cm depth over the catchment, is termed as the yield of the drainage basin
B. The net amount of water which joins the surface streams in a catchment, is known as surface run-off
C. The amount of water which joins the stream from the underground water, is called base flow
D. None of these
D. None of these
Q. 15 The factor for the selection of pumping station site, is
A. Future expansion
B. Distance of the source of contamination or pollution
C. Height above the H.F.L. of the river
D. All the above
D. All the above
Q. 16
A. 12.25 mg/litre
B. 14.25 mg/litre
C. 10.25 mg/litre
D. 16.25 mg/litre
B. 14.25 mg/litre
Q. 17The U.C. (uniformity coefficient) D60/D10 for the best filter media sand should be
A. 2
B. 5
C. 4
D. 3
A. 2
Q. 18Manholes are less common in
A. Cast iron pipes
B. R.C.C. pipes
C. Steel pipes
D. Hume steel pipes
A. Cast iron pipes
Q. 19 For determining the velocity of flow of underground water, the most commonly used non- empirical formula is
A. Hazen’s formula
B. Darcy’s formula
C. Slichter’s formula
D. Lacy’s formula
B. Darcy’s formula
Q. 20The most commonly used chemical for de-chlorination of water, is
A. Sulphur-dioxide
B. Sodium sulphite
C. Sodium thiosulphate
D. Sodium bisulphate
B. Sodium sulphite
Q. 21 To remove very fine suspended particles from water, the method adopted is
A. Sedimentation
B. Boiling
C. Screening
D. Filtration
D. Filtration
Q. 22 Sunlight
A. Increases dissolved oxygen content
B. Helps growth of bacterias
C. Impedes growth of algae
D. Reduces turbidity
C. Impedes growth of algae
Q. 23 The detention period for plain sedimentation water tanks, is usually
A. 8 to 16 hours
B. 16 to 24 hours
C. 4 to 8 hours
D. 24 to 36 hours
D. 24 to 36 hours
Q. 24 Air valves are generally provided in pressure pipes of water supply
A. Near service pipes
B. At pipe junctions
C. At summits
D. At low points
C. At summits
Q. 25 Pick up the correct statement from the following regarding the pressure conduits:
A. The hydraulic gradient line always coincides the invert of the conduit
B. Pressure conduits are permitted to run ¾th full
C. Pressure conduits are always laid along down grades
D. None of these
D. None of these
Q. 26 Pick up the correct statement from the following:
A. Excessive lime when added to water, raises its pH value
B. Lime may be used to soften the hard water
C. Excessive use of lime may kill the bacterias
D. All the above
D. All the above
Q. 27 The gaseous form of chlorine gets converted into liquid form when subjected to a pressure of
A. 7 kg/cm2
B. 5 kg/cm2
C. 6 kg/cm2
D. 10 kg/cm2
A. 7 kg/cm2
Q. 28 Flow through period, in sedimentation tanks, is
A. Less than detention period
B. Detention period divided by displacement efficiency
C. Equal to detention period
D. More than detention period
A. Less than detention period
Q. 29 Turbidity of water may be caused due to
A. Finely divided organic material
B. Suspended clay
C. Suspended silt
D. All the above
D. All the above
Q. 30 Pick up the incorrect statement from the following:
A. The depth of water on the filter should be twice the depth of the filter sand
B. The water entering the slow sand filters should be treated by 9.386 coagulants
C. When the filter head is 0.75 times the depth of filter sand, the water obtained is purest
D. All the above
D. All the above
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