Irrigation MCQs
Irrigation MCQs
Answer these 20+ Irrigation MCQs and assess your grip on the subject of Irrigation.
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1: Pick up the correct statement from the following:
A. All these
B. The full supply level of a canal should be above ground level
C. In case the ground slope is less than the required bed slope, the silt factor must be reduced by permitting the entry of coarse silt
D. According to Lacey, regime conditions require a particular slope for a given discharge and silt factor
2: For designing the venturi head
A. Width of the throat should not be less than one-third of the bed width of main canal
B. Length of the throat should be 2.5 times the depth measured to F.S.L. in the main canal
C. Minimum throat width should not be less than 60 cm
D. Width of the throat should not be less than the width obtained from the formula B = Q / 1.2d3/2, where d is the difference in levels of F.S.L. and sill
E. All these
3: A fall in a canal bed is generally provided, if
A. None of these.
B. Ground slope is practically the same as the designed bed slope
C. Ground slope exceeds the designed bed slope
D. Designed bed slope exceeds the ground slope
4: Pick up the incorrect statement from the following. Culturable commanded area is the gross area of an irrigation canal system less
A. Fallow land
B. Alkaline area
C. Forest area
D. Populated area
5: F.S.L. of a canal at its head with respect to parent channel is kept
A. 15 cm lower
B. At the same level
C. 15 cm higher
D. None of these.
6: The useful moisture of soil, is equal to its
A. Difference between filed capacity and permanent wilting point within the root zone of plants.
B. Saturation capacity
C. Moisture content at permanent wilting point
D. Field capacity
7: Retrogression of the bed level of a river downstream a weir, occurs due to
A. Heavy impact of water
B. Increase of the bed level
C. Less percentage of silt
D. Soft soil strata
8: The saturation line is the line up to which banks get saturated after the canal runs for some time. The saturation gradient in ordinary loam soil, is generally
A. 5 : 1
B. 3 : 1
C. 2 : 1
D. 4 : 1
9: Pick the correct statement from the following:
A. If the flexibility is zero, it is a rigid module
B. All these
C. If the setting of an outlet is lower than that required for proportionality, the outlet is sub-proportional
D. If the setting of an outlet is higher than that required for proportionality, the outlet is hyper-proportional
E. If the flexibility is more than one, the outlet is hyper-proportional
10: Attracting groynes are built
A. Perpendicular to the bank
B. Inclined up stream
C. Inclined down stream
D. None of these
11: The crest level of a canal diversion head work, depends upon
A. None these
B. All these
C. Pond level
D. Discharge perimeters
E. F.S.L. of the canal
12: When a canal flowing under pressure is carried below a natural drainage such that its F.S.L. does not touch the underside of the supporting structure, the structure so provided, is called
A. Syphon-aqueduct
B. Syphon
C. Aqueduct
D. Super passage
13: For the conditions enumerated to provide a crossing at C1 You will probably provide
A. A super-passage
B. An aqueduct
C. A syphon aqueduct
D. None of these
14: In a canal syphon, the flow is
A. With critical velocity
B. Pipe flow
C. Under atmospheric pressure
D. Under negative pressure
15: The measure to remove water logging of land, is
A. To reduce percolation from canals and water courses and to increase outflow from the ground water reservoir
B. To reduce percolation from canals and water courses nor to increase outflow from the ground water reservoir
C. To reduce percolation from canals and water courses
D. To increase outflow from the ground water reservoir
16: Select the correct statement from the following:
A. Duty of canal water is usually calculated at the head discharge of a channel
B. Duty of canal water is defined as the total area irrigated by the discharge averaging one unit during the base period of the duty
C. Duty of canal water at the outlet of a distributary, is generally known as outlet factor or outlet discharge factor
D. All these
E. Duty of canal water at the head of a channel and at the outlet of a distributary, differ considerably due to progressive losses of water
17: A hydraulic structure is designed to withstand
A. All these
B. Seepage forces
C. Hydraulic jump
D. Hydraulic pressure
18: When a canal is carried over a natural drainage, the structure provided, is known as
A. Syphon
B. Syphon-aqueduct
C. Aqueduct
D. Super passage
19: Groynes are generally built
A. Inclined up stream up to 30°
B. Inclined down stream upto 30°
C. All these
D. Perpendicular to the bank
20: For smooth entry of water in a canal, the angle between head regulator and water is generally kept
A. 120°
B. 110°
C. 90°
D. 80°
21: Irrigation allowed farms to be _____ rivers.
A. Below
B. Under
C. On
D. Farther from
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