## Irrigation MCQ Practice Questions (Civil Engineering) Set 3

##### Pick up the incorrect statement from the following:

Options are :

• A bank in the cross-section of a canal is provided on the left
• A bank in the cross-section of a canal is provided on the right
• A 'dowla' in the cross-section of a canal is provided on the left
• None of these

Answer :A bank in the cross-section of a canal is provided on the left

##### Pick up the correct statement from the following:

Options are :

• 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
• Duty of canal water is defined as the total area irrigated by the discharge averaging one unit during the base period of the duty
• Duty of canal water is usually calculated at the head discharge of a channel
• All the above
• Duty of canal water at the outlet of a distributary, is generally known as outlet factor or outlet discharge factor

##### Water-shed line is abondened for aligning an irrigation canal if:

Options are :

• All the above
• Water shed forms a sharp loop
• Canal has to take off from a river
• Towns and villages are located on the water shed line

##### The measure to remove water logging of land, is:

Options are :

• To reduce percolation from canals and water courses
• None of these
• To increase outflow from the ground water reservoir

Answer :To reduce percolation from canals and water courses To increase outflow from the ground water reservoir

Options are :

• 110°
• 90°
• 120°
• 80°

Options are :

• B
• D
• A
• C

##### A water-logged land is found suitable for cultivation due to:

Options are :

• None of these
• Ease of tillage for preparation of the field for optimum condition of germination
• Regular supply of water to plants from the water table by capillary action
• Absence of aeration of soil from root zone of the plant

Options are :

• Exit
• Entry
• Friction

##### The sinuosity of a meander is the ratio of:

Options are :

• Curved length and the straight distance
• Meander length and the width of meander
• None of these
• Meander length and half width of the river

Answer :Curved length and the straight distance

##### Attracting groynes are built:

Options are :

• None of these
• Inclined down stream
• Perpendicular to the bank
• Inclined up stream

##### Pick up the incorrect statement from the following:

Options are :

• In furrow irrigation water is admitted between the rows of plants in the field
• None of these
• In check method of irrigation, the field is divided into smaller compartments and water is admitted to each in turn
• In free flooding irrigation, water is admitted at one corner of a field and is allowed to spread over the entire area

##### The top of the capillary zone:

Options are :

• None of these
• Coincides the water table at every point
• Lies below the water table at every point
• Lies above the water table at every point

Answer :Lies above the water table at every point

##### Groynes are generally built:

Options are :

• Inclined up stream up to 30°
• Perpendicular to the bank
• All the above
• Inclined down stream upto 30°

Answer :Inclined up stream up to 30°

##### F.S.L. of a canal at its head with respect to parent channel is kept:

Options are :

• 15 cm lower
• At the same level
• 15 cm higher
• None of these

##### For a given discharge in a channel, Blench curves give the relationship between the loss of head (HL) and:

Options are :

• Specific energy up-stream
• Depth of water down-stream
• Specific energy down-stream
• Critical depth of water down-stream

Options are :

• B
• D
• A
• C

Options are :

• 11
• 6
• 8
• 10
• 9

##### 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:

Options are :

• Aqueduct
• Syphon
• Super passage
• Syphon-aqueduct

##### A river training work is generally required when the river is:

Options are :

• All the above
• Meandering

##### For designing the venturi head:

Options are :

• 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
• All the above
• Width of the throat should not be less than one-third of the bed width of main canal
• Length of the throat should be 2.5 times the depth measured to F.S.L. in the main canal
• Minimum throat width should not be less than 60 cm

##### The main function of a diversion head works of a canal from a river, is:

Options are :

• All the above
• To remove silt
• To control floods
• To raise water level
• To store water

##### Pick up the incorrect statement from the following. Culturable commanded area is the gross area of an irrigation canal system less:

Options are :

• Populated area
• Forest area
• Fallow land
• Alkaline area

Options are :

• B
• C
• A
• D

Options are :

• B
• D
• C
• A

##### Retrogression of the bed level of a river downstream a weir, occurs due to:

Options are :

• Increase of the bed level
• Less percentage of silt
• Soft soil strata
• Heavy impact of water

##### The length of a meander is the distance along the river between the tangent point of one curve to the tangent point of:

Options are :

• None of these
• Reverse curve
• Reverse curve plus the width of the river
• Next curve of the same order

Answer :Next curve of the same order

##### Irrigation canals are generally aligned along:

Options are :

• Straight line
• Contour line
• Valley line
• Ridge line

Options are :

• 25 cumecs
• 6 cumecs
• 10 cumecs
• 20 cumecs
• 14 cumecs

Options are :

• 0.20 m
• 1.20 m
• 3.20 m
• 4.90 m
• 2.20 m

##### The intensity of irrigation means:

Options are :

• Percentage of gross commanded area to be irrigated annually
• Total depth of water supplied by the number of waterings
• Percentage of the mean of culturable commanded area and the gross commanded area to be irrigated annually
• Percentage of culturable commanded area to be irrigated annually

Answer :Percentage of culturable commanded area to be irrigated annually

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