Irrigation 60 Questions with Answers
1.
The ratio between the area of a crop irrigated
and the quantity of water required during its entire period of the growth is
known as
A.
Delta B. Duty
C.
Base period D. Crop period
Answer: Option B
2. The
total depth of water required by a crop during the entire period the crop is in
the field, is known as
A.
Delta B. Duty
C.
Base period D. Crop period
Answer: Option A
3. The
relation between duty, delta and base period is
A.
Δ=8.64 B/D B. Δ=86.4B/D
C.
Δ=864B/D D. Δ=8640B/D
Answer: Option C
4. Sprinkler
irrigation is adopted for area
A.
Level B. Uneven
C.
Hilly D. None
Answer: Option B
5. Kharif
seasons starts from
A. April and end by September
B.
January
and end by October
C.
October
and end by march
D.
None
of the above
Answer: Option A
6. According
to Dicken’s formula, the flood discharge (Q)
A.
Q=C A2/3
B. Q=C A3/4
C.
Q=C A5/6 D. Q=C A7/8
Answer: Option B
7.
According
to famning’s formula, the flood discharge (Q) is cumecs is given by
A.
Q=C A2/3
B. Q=C A3/4
C.
Q=C A5/6 D. Q=C A7/8
Answer: Option C
8.
The
estimation of flood can be made
A. By physical indication of past
flood
B.
By
flood discharge formulae
C.
By
unit hydrograph
D.
All
of the above
Answer: Option D
9.
The
amount of precipitation is measured by
A.
Rain gauge B. Osmoscope
C.
Turbidimeter D. All of the above
Answer: Option A
10.
The commonly used rain gauge is
A. Weighing bucket type
B.
Tipping
bucket type
C.
Float
type
D.
None
of the above
Answer: Option C
11.
Rainfall is collected by a Symon’s rain gauge
in a
A. Measuring glass
B. Cylindrical vessel
C. Bottle
D. Masonary tank
Answer: Option B
12. A rain gauge should be located in an open
place away from obstrutions at a distance
A. 10 m
B.
30
m
C.
Of
twice the height of the tallest building near-by
D.
Both
(b) & (c)
Answer: Option D
13.
Rain fall measured in
A.
mm B. m
C.
cu. M D. Mill. Cu. M
Answer: Option A
14.
The diameter of the funnel in a Symon’s
rain-gauge is
A.
12.7 cm B. 127 mm
C.
127 m D. 127 cm
Answer: Option B
15. The portion of the catchment the drainage from
which is stopped by an upper tank is called
A. Free catchment
B.
Intercepted
catchment
C.
Combined
catchment
D.
Isolated
catchment
Answer: Option B
16. The mean annual rainfall is measured from a
rainfall records of
A.
20 years B. 30 years
C.
35 years D. 40 years
Answer: Option C
17. The run off of a fan shaped catchment when
compared to fern shaped catchment is
A.
Greater B. Lesser
C.
Equal D. None
Answer: Option A
18. The maximum velocity in a river occurs at
A.
0.2D
below surface
B.
0.6D
below surface
C.
Both
the above
D.
None
of the above
Answer: Option A
19. Current meter is used to find
A.
Discharge B. Run off
C.
Rain fall D. Velocity
Answer: Option D
20. A weir fails due to
A.
Rupture
of floor due to uplift
B.
Rupture
of floor due to suction caused by standing wave
C.
Scour
on the upstream and down stream of the weir
D.
All
of the above
Answer: Option D
21.
According to Khosla’s theory, the critical
hydraulic gradient for alluvial soils is approximately equal to
A.
1 B. 1.5
C.
2 D. 2.5
Answer: Option A
22.
Work constructed on a river for supply of
water to a canal taking off on its upstream side for irrigation purposes are
called
A.
River
training works
B.
Head
works
C.
Brainage
works
D.
Protective works
Answer: Option B
23.
The theory used to design aprons and talus for
weir is given by
A.
Kennedy B. Lacey
C.
Bligh D. Dicken
Answer: Option C
24.
Divide wall is constructed at
A. Between the weir and head
sluice
B.
Between
head sluice and abutment
C.
Between
scouring sluice and weir
D.
None
of the above
Answer: Option C
25.
Piping is resisted by increasing
A. Thickness of apron
B.
Width
of apron
C.
Length
of creep
D.
Length
of rivetment
Answer: Option C
26.
The escape of earth from underneath the
foundation of a weir along with the percolated water results in a phenomenon
called
A.
Piping B. Creep
C.
Uplift D. Scour
Answer: Option A
27.
The lower limit of factor of safety against
overturning in a gravity dam is
A.
1.25 B. 1.75
C.
2.0 D. 1.5
Answer: Option C
28.
For no tension to develop in the gravity dam,
the eccentricity of the resultant force should be
A.
<b/3 B. <b/4
C.
<b/6 D. <b/12
Answer: Option C
29.
If H is the height of water to be stored, S is
the specific gravity of the dam material and µ is the co-efficient of friction
the base width of the elementary profile satisfying the condition of no tension
is given by
A.
H/µ.S B. H/(S-I)
C.
H/√S D. H/√(S-I)
Answer: Option C
30.
Mass curve of inflow is
A.
Never
straight line
B.
Straight line
C.
Parallel line
D.
None
Answer: Option A
31. To determine the area between two contours is
used
A.
Compass B. Telescope
C.
Theodolite D. Planimeter
Answer: Option D
32.
Factor of safety for sliding is given by
A.
Stabilising
moment/overturning moment
B.
Overturning moment/Stabilising moment
C.
Stabilising moment/Total vertical moment
D.
Stabilising moment/Horizontal force
Answer: Option A
33.
Maximum height of earthen dam
A.10
m B. 20 m
C. 30 m D.
50 m
Answer: Option C
34.
The shape of the phreatic line
A.
parabola B. Straight line
C.
Zig-zig line D. Round shape
Answer: Option A
35.
Failure due to “piping” in earth dams may be
caused by
A. Cracking of soil
B. Insufficient capacity of
spillway
C. Erosion of bund due to wave
action
D. Insufficient free board
Answer: Option A
36.
The hydrostatic pressure below the phreatic
line is
A.
Zero B. Positive
C.
Negative D. None
Answer: Option B
37.
Failure of an earth dam due to sliding of
foundation can be prevented by providing
A. Revetment on upstream face of
bund
B.
Key
trenches
C.
Bigger
cross section for dam
D.
Steeper
slopes for the bund
Answer: Option B
38.
A work in which a canal is carried like a bridge
over a drain corssing is called
A. Aqueduct
B. Syphon aqueduct
C. Super passage
D. Syphon
Answer: Option
39.
Field channels are also called
A. Water courses
B.
Minors
C.
Contour
canal
D.
Water
shed canal
Answer: Option A
40.
Kennedy’s relationship from the following is
A.
V0=cdn B. V0=√2/5 f
R
C.
V= [Q f2/140]1/6 D. V=10.8 R2/3 i1/3
Answer: Option A
41.
Draw back in kennedy’s theory is
A. Canal longitudinal equation is
not given
B.
Rigme
theory explained
C.
Final
regime is not clearly explained
D.
Initial
regime is not clearly explained
Answer: Option A
42.
Regime theory is explained by
A.
Kenney B. Lacey
C.
Kutter D. Dicken
Answer: Option B
43.
The canal lining is provided for
A. Preventing of canal breaches
B.
To
avoid water logging
C.
To
control the seepage losses
D.
All
of the above
Answer: Option D
44.
Transmission losses are known as
A. Evaporation losses
B.
Percolation
losses
C.
Seepage
losses
D.
All
the above
Answer: Option D
45.
In field cannels the lining is used
A.
Sodium
carbonate
B.
Asphaltic
C.
Cement concrete
D.
Cement mortar
Answer: Option A
46.
Meandering occurs in what stage of the
following
A. Mountain stage
B. Boulder stage
C. Trough stage
D. Deltaic stage
Answer: Option C
47.
The river build up its bed in type of river
A. Aggregating type
B.
Degrading
type
C.
Stable type
D.
Meandering type
Answer: Option A
48.
If the bed slope is just sufficient to carry
the silt charge with the discharge, then the river is said to be
A. Aggregating type
B.
Degrading
type
C.
Stable type
D.
Meandering type
Answer: Option C
49.
“Degrading type” river is due to
A.
Heavy load
B.
Extention of delta at the river mouth
C.
Sudden reduction of sediment load
D.
None
Answer: Option C
50.
When a river change its course and follows a
sinuous winding path the river is said to be
A. Meandering
B. Stable
C. Aggreating
D. Degrading
Answer: Option A
51.
Which of the following is impermetable spurs
A. Attracting groynes
B. Deflecting groynes
C. Repelling groynes
D. Hockey
groynes
E. All of the above
Answer: Option E
52.
One of the causes of soil erosion is due to
A. Countour bunding
B. Subsurface drainage
C. Beforstation
D. Mixed cropping
Answer: Option C
53.
The cause which may lead to soil erosion
A. Efforestation
B. Cattle grazing
C. Crop rotation
D. Unchecked surface run off
along the slopes
Answer: Option D
54.
The chemical used for reclamation of saline
land
A. Calcium carbonate
B. Sodium chloride
C. Gypsum
D. Potassium nitrate
Answer: Option C
55.
The process of preserving the fertility of
soil is called
A. Soil erosion
B. Soil conservation
C. Soil reclamations
D. Afforestation
Answer: Option B
56.
Due to sheet erosion the productivity of soil
A. Gradually reduced
B. Gradually increased
C. Yield increases
D. None of the above
Answer: Option A
57.
Deforestation and over grazing causes
A. Water logging
B. Soil erosion
C. Increase crop yield
D. Increases fertility
Answer: Option B
58.
The land is considered as water logged when
the depth of ground water is at from ground
A. 3 m B. 1.5 m to 2 m
C.5m
to 6m D. 4m
Answer: Option B
59.
Excessive moisture in soil making the land
loss productive leads to a condition called
A.
Water
logging
B.
Erosion
C.
Deforestation
D.
Sheet
erosion
Answer: Option
A
60.
Isohytes are imaginary lines joining points of
equal
A. Pressure
B. Height
C. Humidity
D. Rainfall
Answer: Option B
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