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Quiz 1
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Q.1
Which of the following methods is used to estimate flood discharge based on high water marks left over in the past ?
slope-area method
area-velocity method
moving boat method
ultra-sonic method
Q.2
The drainage water intercepting the canal can be disposed of by passing the canal below the drainage in
aqueduct and syphon aqueduct
aqueduct and super passage
super passage and canal syphon
level crossing
Q.3
According to Bligh's creep theory, percolating water flows along
Straight path under the foundation of the dam
Circular path under the foundation of the dam
The outline of the base of the foundation of the dam
None of these
Q.4
A river training work is generally required when the river is
Meandering
Aggrading
Degrading
All the above
Q.5
A river training work is generally required when the river is
aggrading type
degrading type
meandering type
both (A) and (B)
Q.6
A land is known as waterlogged
when the permanent wilting point is reached
when gravity drainage has ceased
capillary fringe reaches the root zone of plants
none of the above
Q.7
When the reservoir is full, the maximum compressive force in a gravity dam is produced
at the toe
at the heel
within the middle third of base
at centre of base
Q.8
The maximum rainfall depth of 300 mm in 24 hours has a return period of 100 years. The probability of 24 hours rainfall equal to or greater than 300 mm occurring at least once in 10 years is given by
(0.99)10
1 – (0.99)10
(0.9)00
l-(0.9)100
Q.9
Solution of Laplacian equation in three dimensions d²φ/dx² + d²φ/dy² + d²φ/dz² = 0 of water in a syphon, is done by
Analytical method
Khosla's method
Method of relaxation
Unwin's method
Q.10
In case of a trapezoidal notch fall
Top length of the piers should not be less than their thickness
Splay upstream from the notch section is 45°
Splay downstream from the notch section is 22
½°
All the above
Q.11
The field capacity of a soil is 25%, its permanent wilting point is 15% and specific dry unity weight is 1.5. If the depth of root zone of a crop, is 80 cm, the storage capacity of the soil, is
8 cm
10 cm
12 cm
14 cm
Q.12
Fundamental momentum equation for a hydraulic jump, is
D₁² - D₂² = (2q/g) × (V₁ - V₂)
D₂² - D₁² = (2q/g) × (V - V₂)
D₁² - D₂² = (2q/g) × (V₂ - V₁)
D₁² + D₂² = (2q/g) × (V₂ - V₁)
Q.13
The peak of a 4 hour flood hydrograph is 240 m
3
/sec . If the rainfall excess is 80 mm and base flow which is constant is 40 m
3
/sec, then the peak of 4-hours unit hydrograph will be
20 m
3
/sec
25 m
3
/sec
30 m
3
/sec
35 m
3
/sec
Q.14
The "outlet discharge factor" is the duty at the head of
main canal
branch canal
watercourse
distributory
Q.15
If A is the area of the surface, x̅ is the depth of its C.G. from the surface of the water and ω is the density of water, then
Total pressure on the surface is equal to ωx̅
Depth of the point at which total pressure acts is equal to its moment of inertia divided by Ax̅
Depth of the centre of pressure is 2/3H vertically below the surface
All the above
Q.16
A water-logged land is found suitable for cultivation due to
Ease of tillage for preparation of the field for optimum condition of germination
Absence of aeration of soil from root zone of the plant
Regular supply of water to plants from the water table by capillary action
None of these
Q.17
An outlet which maintains a constant discharge irrespective of fluctuation in the water levels of the supplying channel or water course, is known as
Non-modular outlet
Semi-modular outlet
Flexible modular outlet
Right modular outlet
Q.18
If L is total length of a canal in kilometers, P is total perimeter of its lining in metres and C is the cost of lining per square metre, the additional expenditure involved on lining, is
100 PLC
PLC/1000
PL/1000C
PC/100L
Q.19
The state of the soil when plants fail to extract sufficient water for their requirements, is
Maximum saturated point
Permanent wilting point
Ultimate utilization point
None of these
Q.20
Pick up the incorrect statement from the following. Culturable commanded area is the gross area of an irrigation canal system less
Populated area
Alkaline area
Forest area
Fallow land
Q.21
In gravity canals, F.S.L. is
Always at the ground level
Always below the ground level
Generally 4 to 5 meters above the ground level
Only a few cm above the ground level
Q.22
Which of the following types of rain gauges is used for measuring rain in remote hilly inaccessible areas ?
tipping bucket type
weighing type
floating type
Simon’s raingauge
Q.23
Which of the following can be used as a meter fall ?
vertical drop fall
flumed glacis fall
unflumed glacis fall
all of the above
Q.24
The value of Sodium Absorption Ratio for high sodium water lies between
0 to 10
10 to 18
18 to 26
26 to 34
Q.25
If Δ is the depth of water in metres, B is the number of days of base period and D is the duty in hectare/cumec, the relationship which holds good, is
D = Δ (8.64 D/B)
B = Δ (8.64 B/D)
D = (8.6 Δ/B)
Δ = (8.6 B/D)
Q.26
The ratio of rate of change of the discharge of an outlet to the rate of change of the discharge of distributing channel is called
proportionality
flexibility
setting
sensitivity
Q.27
If D is the depth of water upstream of the throat above its sill, B is the width of the throat, to achieve critical flow in an open venturi flume, the theoretical maximum flow Q, is
Q = 1.71 BD
1/2
Q = 1.71 BD
Q = 1.71 BD
3/2
Q = 1/71 BD
2/3
Q.28
If d is the depth of the aquifer through which water is flowing, then the relationship between permeability k and transmissible T is given by
T = kd
T = k/d
T= Vkd
k= VTd
Q.29
The ratio of the discharge over a trapezoidal crest to a rectangular crest of Sarda falls of identical parameters, is
1.084
1.074
1.064
1.054
Q.30
A fall in a canal bed is generally provided, if
Ground slope exceeds the designed bed slope
Designed bed slope exceeds the ground slope
Ground slope is practically the same as the designed bed slope
None of these
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