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Free download in PDF Irrigation Objective Type Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
(21)
The amount of irrigation water required to meet the evapotranspiration needs of the crop during its full growth is called
[A]
consumptive irrigation requirement
[B]
net irrigation requirement
[C]
effective rainfall
[D]
consumptive use
Answer: consumptive irrigation requirement
(22)
With the increase in the quantity of water supplied, the yield of most crops
[A]
increases upto a certain limit and then decreases
[B]
increases upto a certain limit and then becomes constant
[C]
increases continuously
[D]
decreases continuously
Answer: increases upto a certain limit and then decreases
(23)
If the intensity of rainfall is more than the infiltration capacity of soil, then the infiltration rate will be
[A]
equal to infiltration capacity
[B]
more than infiltration capacity
[C]
more than rate of rainfall
[D]
equal to rate of rainfall
Answer: equal to infiltration capacity
(24)
Cyclonic precipitation is caused by lifting of an air mass due to
[A]
natural topographical barriers
[B]
temperature difference
[C]
pressure difference
[D]
all of the above
Answer: pressure difference
(25)
A raingauge should preferably be fixed
[A]
in an open space
[B]
in a closed space
[C]
under the tree
[D]
near the building
(26)
The most suitable material for the central impervious core of a zoned embankment type dam is
[A]
clay mixed with fine sand
[B]
silty clay
[C]
coarse sand
[D]
clay
Answer: clay mixed with fine sand
(27)
As compared to gravity dams, earthen dams
[A]
require less skilled labour
[B]
require sound rock foundations
[C]
are costlier
[D]
are less susceptible to failure
Answer: require less skilled labour
(28)
For wave action in dams, the maximum height of freeboard is generally taken to be equal to
[A]
1.50 hw
[B]
1.25 hw
[C]
0.5 hw
[D]
0.75 hw
(29)
The maximum permissible eccentricity for no tension at the base of a gravity dam is
[A]
B/6
[B]
B/4
[C]
B/2
[D]
B/3
(30)
When the reservoir is full, the maximum compressive force in a gravity dam is produced
[A]
within the middle third of base
[B]
at centre of base
[C]
at the toe
[D]
at the heel
31
The major resisting force in a gravity dam is
[A]
self-weight of dam
[B]
uplift pressure
[C]
wave pressure
[D]
water pressure
Answer: self-weight of dam
32
Hydrodynamic pressure due to earthquake acts at a height of
[A]
4H/371 above the base
[B]
4H737t below the water surface where H is the depth of water.
[C]
3H747t below the water surface
[D]
3H/47I above the base
Answer: 4H/371 above the base
33
Horizontal acceleration due to earthquake results in
[A]
inertia force into the body of the dam
[B]
hydrodynamic pressure
[C]
both (a) and (b)
[D]
none of the above
34
The uplift pressure on the face of a drainage gallery in a dam is taken as
[A]
two-third of hydrostatic pressure at toe plus one-third of hydrostatic pressure at heel
[B]
average of hydrostatic pressure at toe and heel
[C]
hydrostatic pressure at toe
[D]
none of the above
Answer: two-third of hydrostatic pressure at toe plus one-third of hydrostatic pressure at heel
35
When the upstream face of a gravity dam is vertical, then the intensity of water pressure at the water surface and at the base respectively will be
[A]
OandwII
[B]
wH and 0
[C]
0 and wH212
[D]
wH2/2and wH2/3
36
The total capacity of a reservoir is 25 million cubic metres and dead storage is 5 million cubic metres. If the average volume of sediment deposition is 0.10 million cubic metre per year, then the usefulness of the reservoir will start reducing after
[A]
250 years
[B]
50 years
[C]
200 years
[D]
150 years
37
Trap efficiency of a reservoir is a function of
[A]
outflow/inflow ratio
[B]
capacity/outflow ratio
[C]
capacity/inflow ratio
[D]
none of the above
Answer: capacity/inflow ratio
38
For a flood control reservoir, the effective storage is equal to
[A]
useful storage + surcharge storage -valley storage
[B]
useful storage + surcharge storage + valley storage
[C]
useful storage – valley storage
[D]
useful storage + surcharge storage
Answer: useful storage + surcharge storage -valley storage
39
The water stored in the reservoir below the minimum pool level is called
[A]
dead storage
[B]
surcharge storage
[C]
useful storage
[D]
valley storage
40
The useful storage is the volume of water stored in the reservoir between
[A]
river bed and minimum pool level
[B]
minimum pool level and normal pool level
[C]
normal pool level and maximum pool level
[D]
minimum pool level and maximum pool level
Answer: minimum pool level and normal pool level
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