Online Civil Engineering Test - Irrigation Test

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Total number of questions: 20.
Time allotted: 30 minutes.
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Pick up the incorrect statement from the following:

In free flooding irrigation, water is admitted at one corner of a field and is allowed to spread over the entire area

In check method of irrigation, the field is divided into smaller compartments and water is admitted to each in turn

In furrow irrigation water is admitted between the rows of plants in the field

None of these.

[#]

The intensity of irrigation means

percentage of culturable commanded area to be irrigated annually

percentage of gross commanded area to be irrigated annually

percentage of the mean of culturable commanded area and the gross commanded area to be irrigated annually

total depth of water supplied by the number of waterings.

[#]

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

at the same level

15 cm lower

15 cm higher

none of these.

[#]

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.

[#]

When a canal is carried over a natural drainage, the structure provided, is known as

syphon

aqueduct

super passage

syphon-aqueduct.

[#]

Attracting groynes are built

perpendicular to the bank

inclined down stream

inclined up stream

none of these.

[#]

The state of the soil when plants fail to extract sufficient water for their requirements, is

maximum saturated point

permanent wilting point

ultimate utilisation point

none of these.

[#]

In north Indian Plains, optimum depth of kor watering for wheat, is

23.0 cm

19.0 cm

17.5 cm

13.5 cm

12.0 cm

[#]

The Lacey's regime velocity is proportional to

R^1/2 S^3/4

Q^3/4 S^1/3

R^3/4 S^1/3

R^2/3 S^1/2

[#]

10.

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.

[#]

11.

In Montague type fall

a straight glacis is provided

a circular glacis is provided

a parabolic glacis is provided

no glacis is provided.

[#]

12.

The down stream expansion head of a guide bank is extended to subtend an angle at the centre, equal to

30°

45°

60°

90°

[#]

13.

Lacey's equation for calculating flood discharge in rivers, is

V = 10.8 R^1/2 S^1/2

V = 10.8 R^2/3 S^1/2

V = 10.8 R^2/3 S^1/3

V = 10.8 R^1/3 S^2/3

[#]

14.

Pick up the correct statement from the following:

Water table generally follows the ground surface above it with a few exceptions

Static level of water in an open well indicates the position of the water table

Saturated pores of a soil in the capillary zone above water table have negative pressure

At water table, hydrostatic pressure is zero

All the above.

[#]

15.

The ratio of the rate of change of discharge of an outlet to the rate of change in level of water surface in a distributary at its normal depth, is known as

efficiency

sensitivity

flexibility

modular limit.

[#]

16.

In a concrete canal the approximate permissible velocity of water should not exceed

0.5 m/sec

1 m/sec

1.5 m/sec

2 m/sec

2.5 m/sec

[#]

17.

If A is the area of the surface, x 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 ω x

depth of the point at which total pressure acts is equal to its moment of inertia divided by A x

depth of the centre of pressure is 2/3H vertically below the surface

all the above.

[#]

18.

If the height of the hydraulic gradient line above the floor of thickness t is h and the specific gravity of the material of the floor is G, the minimum thickness t of the floor down stream of the crestwall, is given by the equation

[#]

19.

To control the silt entry into a distributary at head regulator, King's vanes are provided which are the walls

of R.C.C. or steel plate 8 cm thick

of height l/3rd to l/4th the depth of water in the main canal

spaced at interval of

times their heights

extending about one metre beyond a line drawn at an inclination of 2 : 1 to the axis of main canal

all the above.

[#]

20.

Cross regulators in main canals are provided

to regulate water supply in the distributaries

to increase water head upstream when a main canal is running with low supplies

to overflow excessive flow water

none of these.

[#]

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Online Civil Engineering Test - Irrigation Test

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