Question 1

Lacey assumed a trapezoidal cross-section of a regime channel

Accepted Answer

Lacey assumed a regime channel to have a parabolic cross-section, not trapezoidal.

Question 2

Lining of a canal
A)increases
B)decreases
C)does not effect

Accepted Answer

Lining of a canal decreases seepage and water loss, thereby improving water efficiency and reducing the loss of water into the surrounding soil.

Question 3

The berms when fully formed
A)reduce the absorption losses and prevents leaks
B)protect the bank from erosion because of wave action
C)provide a scope for future widening the channel
D)all of the above

Accepted Answer

Berms, when fully formed, serve multiple purposes: they reduce absorption losses and prevent leaks, protect the bank from erosion due to wave action, and provide scope for future widening of the channel. Thus, all the given options are correct.

Question 4

Irrigation is supplementary to rainfall.

Accepted Answer

Irrigation is used to supplement rainfall in order to provide adequate water for the growth of crops.

Question 5

Trough stage of river is most suitable location for diversion head works.

Accepted Answer

The trough stage of a river is the most suitable location for diversion head works because it provides a stable and reliable source of water. The trough stage is located at the lowest point in the river's cross-section, and it is typically characterized by a slow-moving current and a deep pool of water. This makes it an ideal location for diverting water into a canal or other water conveyance system.

Question 6

A useful soil moisture for plant growth is
A)capillary water
B)gravitational water
C)hygroscopic water
D)all of these

Accepted Answer

Capillary water is the type of soil moisture that is most useful for plant growth because it is held in the soil pores by surface tension and is readily available for absorption by plant roots.

Question 7

An outlet in which the discharge depends upon the difference in level between the water levels in distributing channel and the water course, is known as
A)non-modular outlet
B)semi-module outlet
C)modular outlet
D)rigid module

Accepted Answer

Non-modular outlets are those where the discharge depends on the difference in water levels between the distributing channel and the water course, unlike modular outlets where discharge is designed to remain constant regardless of the water level differences.

Question 8

The river training works are adopted on a river
A)to pass high flood discharge safely and quickly through the breach
B)to direct and guide the river flow
C)to reduce bank erosion to a minimum
D)all of the above

Accepted Answer

River training works are adopted for various purposes including safely passing high flood discharge, directing and guiding the river flow, and minimizing bank erosion.

Question 9

The science which deals with the measurement of water is called hydrometry.

Accepted Answer

Hydrometry is the science that involves the measurement of water, including its flow and quality in natural or artificial channels.

Question 10

The gap or margin of height, between full supply level (F.S.L.) and top of the bank is called
A)free board
B)dowel
C)inspection roadway
D)berm

Accepted Answer

Free board is the term used to describe the vertical distance between the full supply level of a reservoir, canal, or other body of water and the top of the embankment or bank. This margin is crucial for providing safety against waves or sudden increases in water level.

Question 11

The optimum depth of kot watering is 19 cm for
A)wheat
B)sugar-cane
C)rice
D)cotton

Accepted Answer

Rice fields are typically flooded with water to a depth of around 19 cm to ensure proper growth and yield.

Question 12

The width of meandering belt is the
A)transverse distance between the apex point of one curve and apex point on reverse curve
B)axial distance along the river between tangent point of one curve and tangent point of other curve of same order
C)axial distance along the river between the apex point of one curve and apex point on reverse curve
D)transverse distance along the river between tangent point of one curve and tangent point of other curve of same order

Accepted Answer

The width of a meandering belt is defined as the transverse distance between the apex point of one curve and the apex point on the reverse curve. This measurement captures the lateral extent of the meandering pattern across the landscape.

Question 13

The function of a scouring sluice is
A)to control the silt entry into the canal
B)to scour the silt deposited in the river bed above the approach channel
C)to pass the low floods without dropping the shutters of the main weir
D)all of the above

Accepted Answer

Scouring sluices serve multiple purposes: they control silt entry into the canal, scour silt deposited in the river bed above the approach channel, and allow low floods to pass without the need to drop the shutters of the main weir.

Question 14

In case of syphon aqueduct, the H.F.L. of the drain is
A)much below the bottom of the canal trough
B)much higher above the canal bed
C)in level with the canal bed
D)none of the above

Accepted Answer

In the case of a syphon aqueduct, the High Flood Level (H.F.L.) of the drain is much higher above the canal bed. This design allows the drainage water to pass over the canal, which is carried through a conduit or syphon below the drainage channel.

Question 15

A canal head work in rocky stage of a river is not suitable because
A)more cross drainage works are required
B)a costly head regulator is required
C)more falls are necessary to dissipate the energy
D)all of the above

Accepted Answer

Constructing a canal headwork in the rocky stage of a river is challenging due to the need for more cross drainage works to manage water flow, a costly head regulator to control water discharge, and more falls to dissipate the energy of the flowing water, making all of the options correct.

Question 16

Non-silting, non-scouring velocity is called
A)mean
B)critical

Accepted Answer

The non-silting, non-scouring velocity is referred to as the critical velocity. It is the velocity at which the flow of water in a channel is just sufficient to transport sediment without causing erosion (scouring) or deposition (silting).

Question 17

Sprinklar irrigation is adopted for
A)level
B)uneven
C)hilly

Accepted Answer

Sprinkler irrigation is suitable for uneven terrain as it can distribute water uniformly over the area regardless of the land's topography.

Question 18

In a Sarda type fall, the trapezoidal crest is used for discharges over 14 m³/s.

Accepted Answer

The Sarda type fall is designed with a trapezoidal crest to efficiently handle larger discharges, typically over 14 m³/s, by providing a stable and effective flow over the structure.

Question 19

The flexibility of a sub-proportional outlet is less than one

Accepted Answer

The flexibility of a sub-proportional outlet, which is defined as the ratio of the change in flow rate to the change in pressure, is indeed less than one, indicating that the flow rate changes less than proportionally to changes in pressure.

Question 20

A part of water which will move out of the soil, if proper drainage is provided, is known as gravitational water.

Accepted Answer

Gravitational water refers to the portion of water in the soil that moves downward through the soil profile due to the force of gravity and can be drained away if proper drainage is provided.

Quiz 3: Irrigation and Water Management: Part C

Lacey assumed a trapezoidal cross-section of a regime channel

Lining of a canal

The berms when fully formed

Irrigation is supplementary to rainfall.

Trough stage of river is most suitable location for diversion head works.

A useful soil moisture for plant growth is

An outlet in which the discharge depends upon the difference in level between the water levels in distributing channel and the water course, is known as

The river training works are adopted on a river

The science which deals with the measurement of water is called hydrometry.

The gap or margin of height, between full supply level (F.S.L.) and top of the bank is called

The optimum depth of kot watering is 19 cm for

The width of meandering belt is the

The function of a scouring sluice is

In case of syphon aqueduct, the H.F.L. of the drain is

A canal head work in rocky stage of a river is not suitable because

Non-silting, non-scouring velocity is called

Sprinklar irrigation is adopted for

In a Sarda type fall, the trapezoidal crest is used for discharges over 14 m3/s.

The flexibility of a sub-proportional outlet is less than one

A part of water which will move out of the soil, if proper drainage is provided, is known as gravitational water.

In a Sarda type fall, the trapezoidal crest is used for discharges over 14 m³/s.