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Quiz 4
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Q.1
If the demand line drawn from a ridge in a flow mass curve does not intersect the curve again, it indicates that
demand cannot be met by inflow
reservoir was not full at the beginning
both (A) and (B)
none of the above
Q.2
In North Indian Plains, optimum depth of kor watering for wheat, is
23.0 cm
19.0 cm
17.5 cm
13.5 cm
Q.3
The main cause of silting up a channel,
Non-regime section
Inadequate slope
Defective head regulator
All the above
Q.4
A fall which maintains its depth, is
A trapezoidal notch fall
A low weir fall
A rectangular notch fall
All the above
Q.5
The net speed under which the turbine reaches its peak efficiency is called
design speed
rated speed
gross speed
operating speed
Q.6
When a canal is carried over a natural drainage, the structure provided, is known as
Syphon
Aqueduct
Super passage
Syphon-aqueduct
Q.7
For the upstream face of an earthen dam, the most adverse condition for stability of slope is
sudden drawdown
steady seepage
during construction
sloughing of slope
Q.8
If there are two canals taking off from each flank of a river, then there will be
one divide wall and one undersluice
one divide wall and two undersluices
two divide walls and one undersluice
two divide walls and two undersluices
Q.9
Horizontal acceleration due to earthquake results in
hydrodynamic pressure
inertia force into the body of the dam
both (A) and (B)
none of the above
Q.10
The most suitable material for the central impervious core of a zoned embankment type dam is
clay
coarse sand
silty clay
clay mixed with fine sand
Q.11
The relation between probability (P) and recurrence interval (T) is given by
PT = 1
PT2 = 1
P/T = 1
P/T2 = 1
Q.12
Retrogression of the bed level of a river downstream a weir, occurs due to
Heavy impact of water
Increase of the bed level
Less percentage of silt
Soft soil strata
Q.13
The depth of the crest of a scouring sluice below the crest of a head regulator, is generally kept
0.20 m
1.20 m
2.20 m
3.20 m
Q.14
If the critical shear stress of a channel is XC, then the average value of shear stress required to move the grain on the bank is
0.5 XC
0.75 TC
XC
1.33 TC
Q.15
Main purpose of mean water training for rivers is
Flood control
To provide sufficient depth of water in navigable channels, during low water periods
To preserve the channel in good shape by efficient disposal of suspended and bed load
All of the above
Q.16
The stream which does not have any base flow contribution is called
perennial stream
intermittent stream
ephemeral stream
none of the above
Q.17
The depth of rice root zone, is
50 cm
60 cm
80 cm
90 cm
Q.18
To control the silt entry into a distributary at head regulator, King's vanes are provided which are the walls
Of R.C.C. or steel plate 8 cm thick
Of height ⅓rd to ¼th the depth of water in the main canal
Spaced at interval of 1½ times their heights
All the above
Q.19
A unit hydro graph has one unit of
rainfall duration
rainfall excess
time base of direct runoff
discharge
Q.20
The top of the capillary zone
Lies below the water table at every point
Lies above the water table at every point
Coincides the water table at every point
None of these
Q.21
Tortuosity of a meandering river is always
equal to 1
less than 1
greater than 1
less than or equal to 1
Q.22
The discharge passing over an ogee spillway is given by (where, L is effective length of spillway crest and H is the total head over the spillway crest including velocity head.)
CLH3/2
CHL3/2
CLH5/2
CLH1/2
Q.23
The measure to remove water logging of land, is
To reduce percolation from canals and water courses
To increase outflow from the ground water reservoir
Both (A) and (B)
Neither (A) nor (B)
Q.24
A raingauge should preferably be fixed
near the building
under the tree
in an open space
in a closed space
Q.25
With the increase in the quantity of water supplied, the yield of most crops
increases continuously
decreases continuously
increases upto a certain limit and then becomes constant
increases upto a certain limit and then decreases
Q.26
If D is the depth of scour below original bed, then the width of launching apron is generally taken as
1.2 D
1.5 D
2.0 D
2.5 D
Q.27
A runoff river plant is
a low head scheme
a medium head scheme
a high head scheme
none of the above
Q.28
The ratio of the quantity of water stored in the root zone of the crops to the quantity of water actually delivered in the field is known as
water conveyance efficiency
water application efficiency
water use efficiency
none of the above
Q.29
In a barrage, the crest level is kept
Low with large gates
High with large gates
High with no gates
Low with no gates
Q.30
Bligh's theory of seepage assumes
Equal weightage to the horizontal and vertical creep
More weightage to horizontal creep than vertical creep
Less weightage to horizontal creep than vertical creep
Loss of head follows the sine curve
0 h : 0 m : 1 s
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