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Quiz 5
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Q.1
If B and d are the bed width and depth of a channel in meters, the combined losses due to evaporation and seepage in cumecs per kilometer length of the channel, is
(1/50) × (B + d)
2/3
(1/100) × (B + d)
2/3
(1/150) × (B + d)
2/3
(1/200) × (B + d)
2/3
Q.2
For a standing crop, the consumptive use of water is equal to the depth of water
Transpired by the crop
Evaporated by the crop
Transpired and evaporated by the crop
Used by the crop in transpiration, evaporation and also the quantity of water evaporated from adjacent soil
Q.3
For a proportional outlet, the flexibility is
zero
between zero and 1
1
greater than 1
Q.4
A hydraulic structure is designed to withstand
Seepage forces
Hydraulic jump
Hydraulic pressure
All the above
Q.5
Attracting groynes are built
Perpendicular to the bank
Inclined down stream
Inclined up stream
None of these
Q.6
If it rains between 2 P.M. and 3 P.M. and the entire basin area just starts contributing water at 3 P.M. to the outlet, then time of concentration will be
15 minutes
20 minutes
30 minutes
60 minutes
Q.7
Lane's weighted creep theory assumes
Equal weightage to horizontal and vertical creeps
Double weightage to horizontal creep and one weightage to vertical creep
Triple weightage to horizontal creep and one weightage to vertical creep
Triple weightage to vertical creep and one weightage to horizontal creep
Q.8
Infiltration is the
movement of water through the soil
absorption of water by soil surface
both (A) and (B)
none of the above
Q.9
Which of the following is a flexible outlet ?
submerged pipe outlet
Kennedy’s gauge outlet
Gibb’s outlet
none of the above
Q.10
As compared to crest of the normal portion of the weir, the crest of the under sluice portion of weir is kept at
lower level
higher level
same level
any of the above depending on the design
Q.11
The runoff increases with
increase in intensity of rain
increase in infiltration capacity
increase in permeability of soil
all of the above
Q.12
As per Lacey’s theory, the silt factor is
directly proportional to average par¬ticle size
inversely proportional to average par¬ticle size
directly proportional to square root of average particle size
not related to average particle size
Q.13
The ratio of the rate of change of discharge of an outlet to the rate of change in level of water surface in a distributary at its normal depth, is known as
Efficiency
Sensitivity
Flexibility
Modular limit
Q.14
For supplying water to rabi crop, kharif crop and sugarcane, the channel is designed for a capacity equal to the greater of the water requirement of
rabi or kharif
rabi and kharif or sugarcane
rabi and sugarcane or kharif and sugarcane
rabi or kharif or sugarcane
Q.15
Study the following statements.
i) Levees are constructed parallel to river flow,
ii) Spurs are constructed parallel to river flow,
iii) Levees are constructed transverse to river flow,
iv) Spurs are constructed transverse to river flow.
The correct answer is
(i) and (ii)
(i) and (iv)
(ii) and (iii)
(iii) and (iv)
Q.16
Instantaneous unit hydrograph is a hydrograph of
i) unit duration
ii) unit rainfall excess
iii) infinitely small duration
iv) infinitely small rainfall excess
The correct answer is
(i) and (ii)
(i)and(iv)
(ii) and (iii)
(iii) and (iv)
Q.17
Vertical drop fall is satisfactory for a height upto
0.5 m
1.5 m
3.5 m
5.0 m
Q.18
In a chute spillway, the flow is usually
uniform
subcritical
critical
super critical
Q.19
Groynes are generally built
Perpendicular to the bank
Inclined up stream up to 30°
Inclined downstream up to 30°
All the above
Q.20
Meandering of a river generally occurs, in
Rocky stage
Delta stage
Boulder stage
Trough stage
Q.21
Optimum depth of kor watering for rice is
135 mm
165 mm
190 mm
215 mm
Q.22
A river bend characterized by silting
scouring on concave side
silting on convex side
scouring on convex side and on concave side
scouring on concave side and silting on convex side
Q.23
To estimate the magnitude of a flood with a return period of T years, Gumbel’s distribution method requires the following data pertaining to annual flood series
i) mean value
ii) standard deviation
iii) length of record
iv) coefficient of skew
The correct answer is
(i) and (ii)
(i),(ii) and (iii)
(i), (ii) and (iv)
(i), (ii), (iii) and (iv)
Q.24
Presence of tail water in a gravity dam
i) increases the principal stress
ii) decreases the principal stress
iii) increases the shear stress
iv) decreases the shear stress
The correct answer is
(i) and (iii)
(i)and(iv)
(ii) and (iii)
(ii) and (iv)
Q.25
A current meter is used to measure the
velocity of flow of water
depth of flow of water
discharge
none of the above
Q.26
To determine the discharge at a section in a stream from its rating curve, the required data are
i) slope of water surface at the section
ii) stage at the section
iii) current meter readings at the section
The correct answer is
(i) and (ii)
(ii) and (iii)
only (ii)
only (iii)
Q.27
Variability of rainfall is
i) largest in regions of high rainfall
ii) largest in coastal areas
iii) largest in regions of scanty rainfall
The correct answer is
only (i)
(i) and (ii)
only (iii)
(ii) and (iii)
Q.28
The rainfall on five successive days were measured as 100 mm, 80 mm, 60 mm, 40 mm and 20 mm respectively. If the infiltration index or the storm loss rate for the catchment area is earlier estimated as 50 mm/day, the total surface run off will be
50 mm
60 mm
90 mm
140 mm
Q.29
When a canal and a drainage approach each other at the same level, the structure so provided, is
An aqueduct
A syphon
A level crossing
Inlet and outlet
Q.30
Interception losses are due to
i) evaporation
ii) transpiration
iii) stream flow
The correct answer is
only (i)
(i)and(ii)
(ii) and (iii)
(i), (ii) and (iii)
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