Agriculture MCQs

Page No. 162

The groyne pointing upwards direction of flow is called ______________________?


aAttracting

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bRepelling

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cImpermeable

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dPermeable

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View Answer Repelling

If the weir flood is designed continuous with divide piers as reinforced structure,such that the weight of divide piers, keep the structure safe against uplift, is called__________________?


aNon-gravity weir

✓


bGravity weir

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cSharp crested weir

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dRectangular weir

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View Answer Non-gravity weir

The rise in river water level at up stream due to construction of weir is called__________________?


aPond level

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bHFL

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cAfflux

✓


dFSL

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View Answer Afflux

Silt free water should be supplied to the canals through______________________?


aUnder sluices

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bHead sluices

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cScouring sluices

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dSluice gates

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View Answer Head sluices

The wall of masonry or concrete, constructed at 90° to the axis of weir to separate normal weir from under sluices is called____________________?


aDivide wall

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bRetaining wall

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cToe wall

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dAll are correct

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View Answer Divide wall

A fish ladder is device by which flow energy can be dissipated in such a manner as to provide easy access to the downstream fish to come on upstream side, the velocity of flow varies from___________________?


a2.0 – 2.5 m/sec

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b2.5 – 3.0 m/sec

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c3.0 – 3.5 m/sec

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d3.5 – 4.0 m/sec

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View Answer 3.0 – 3.5 m/sec

In high floods, to avoid spilling of flood water over the gates, a wall is provided from pond level to high Flood level. This wall spans for the entire length of regulator, rest on piers, sustain water pressure by its weight called_____________________?


aRetaining wall

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bBreast wall

✓


cDivide wall

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dCantilever wall

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View Answer Breast wall

The structures, which are constructed on the river bed upstream of head regulator. With this clear water enters in canal such structures are called______________________?


aSilt excluders

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bSilt ejectors

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cVortex pipes

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dSilt control structures

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View Answer Silt excluders

The depth before the jump is always less then the depth after the jump. The depth before the jump is called initial depth and depth after the jump is called_______________?


aAfflux

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bFinal depth

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cSequent depth

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dDown stream water depth

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View Answer Sequent depth

Mostly the hydraulic structures founded on ____________ soils fails because of undermining and uplift pressure?


aStable

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bRocky

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cImpermeable

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dPermeable

✓


View Answer Permeable

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