Practice Water Resources Engineering Multiple Choice Questions with Answers Quiz-3

Q.1.

The average mean velocity of a stream having depth h, may be obtained by taking the average of the readings of a current meter at a depth of

0.1 h and 0.9 h
0.2 h and 0.8 h
0.3 h and 0.7 h
0.4 h and 0.6 h.

Q.2.

The efficiency of a pump may be taken as

0.55
0.60
0.65
0.70

Q.3.

Ryve's formula for flood estimate in cumecs, is

Q = CA^3/4
Q = CA^2/3
Q = CA^1/2
Q = CA^1/4.

Q.4.

Pick up the correct statement from the following :

Hydrograph is a plot of discharge and time
In hydrographs, time is plotted on X-axis
The maximum flow in the river due to rainfall, is called peak flow
Peak flows are different for rainfalls
All the above.

Q.5.

Pettis formula Q = C (P.B)^5/4 cumecs, is based upon

rainfall and drainage area
run off and drainage area
drainage area and its shape
drainage area.

Q.6.

Pick up the correct statement from the following :

The intensity of rain is the rate at which it falls
The duration of rain is the time for which it falls with a given intensity
The frequency of rain is the number of times, if falls
All the above.

Q.7.

A well is sunk in an unconfined aquifer having a saturated depth ofm. Assuming the equilibrium flow conditions and a homogeneous aquifer and radius of influence to be same, the ratio of discharges atm andm draw downs, is

2/3
5/4
4/5
7/8
8/7

Q.8.

If the area of storm hydrograph is equal to 10² cm, the ordinates of a unit hydrograph may be obtained by dividing the ordinates of the storm hydrograph by

0.5
1
2
3
4

Q.9.

Symon's rain gauge is

tipping-bucket gauge
weighing type gauge
float recording gauge
non-recording gauge.

Q.10.

The best unit period of a unit hydrograph, is equal to basin lag divided by

2
3
4
5

Q.11.

For determination of average annual precipitation in a catchment basin, the best method is

Arithmetical method
Thiessen's mean method
Isohyetal method
None of these.

Q.12.

Pressure exerted by fully saturated air, is known

partial pressure
vapour pressure
saturation vapour pressure
saturation pressure
(c) and (d) of the above.

Q.13.

The respective storm totals at three surrounding stations A, B and C areandmm. If the normal annual precipitation amounts at stations X, A, B and C are respectivelyandmm, the estimated storm precipitation at X is

75 mm
77 mm
79 mm
81 mm.

Q.14.

Precipitation includes

rain
snow
hail
all of these.

Q.15.

Pick up correct statement from the following :

The air from outer portion of cyclones gets lifted for causing precipitation
The air from central portion of cyclone's gets lifted for causing precipitation
The air from entire surface of the cyclones gets lifted for causing precipitation
None of those.

Q.16.

Pick up the correct statement from the following :

The unit hydrograph of a specified unit duration obtained from the past data can be used to obtain the hydrograph of future storms of like duration
To obtain the ordinates of storm hydrograph, the ordinates of unit hydrograph are multiplied by the multiplying factor
The multiplying factor for storm hydrograph may be obtained by dividing the run off in mm by 25 mm
A tolerance of about 25% of specified duration of unit hydrograph may be accepted without any serious error
All the above.

Q.17.

If the velocities of flow of a stream ofm depth recorded by a current meter at depths of 2 m and 8 m are 0.7 m and 0.3 m respectively, the discharge per unit width of the stream in cubic metres, is

2
3
4
5
6

Q.18.

For efficient working of a control meter, its throat length is approximately kept

equal to the critical depth
twice the critical depth
three times the critical depth
four times the critical depth.

Q.19.

Levees and flood walls,

are designed to carry unbalanced water load
are designed with adequate dimensions
are means of controlling floods
are never provided free-boards.

Q.20.

Pick up the correct statement from the following :

A confined bed of impervious material laid over an acquifer, is known as an aquiclude
The top most water bearing strata having no acquifer, is known as non-artesion acquifer
The ordinary gravity wells which supply water from the top most water bearing strata, are called water table wells
A permeable stratum which is capable to yield appreciate quantities of ground water, is known as an aquifer
All the above.

Q.21.

A soil strata may consist of

soil zone
intermediate zone
capillary zone
ground water zone
all the above.

Q.22.

Pick up the correct statement from the following :

Run off and surface run off are the same
Run off includes the water flowing over the surface
Run off is sometimes called discharge of the river
Surface run off is sometimes called stream flow.

Q.23.

If the viscosity of ground water is 1.the Slitcher's constant isthe effective size of soil particles in acquifer is 0.5 mm and hydraulic gradient is 1 inthe velocity of flow is

0.25 m/day
0.50 m/day
0.75 m/day
1.00 m/day
1.25 m/day.

Q.24.

Pick up the incorrect statement from the following :

At two meteorologically homogeneous stations, the average annual precipitation is same
If the average annual precipitation at two places is same these are meteorologically homogeneous stations
Neither (a) nor (b)
Both (a) and (b).

Q.25.

Evaporation losses depend upon

area of the water surface and depth of the water
nature of precipitation and type of vegetation
humidity and wind velocity
atmospheric temperature
all the above.

Q.26.

The rainfall cycle period in India is taken as

15 years
20 years
25 years
30 years
35 years.

Q.27.

If total run off of a basin ofhectares is 0.8 cm, the ordinate of Bernard's distribution graph, may be calculated by the formula (where Q is the discharge in cumecs at the given time)

y = 50 Q
y = 100 Q
y = 150 Q
y = 200 Q
y = 250 Q

Q.28.

The area of a drainage basin whose axial length iskm issq. km. Its form factor is

0.10
0.20
0.25
0.30
0.35

Q.29.

If h is the loss due to friction in a pipe. Total losses in strainer and bends may be taken as

0.01 h
0.45 h
0.20 h
0.25 h
0.3 h.

Q.30.

Isopiastic lines are the contours

drawn to represent water table
drawn to represent piezometric heads
drawn to piezometric surface
none of these.

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