Agriculture MCQs

Page No. 162

The groyne pointing upwards direction of flow is called ______________________?


aAttracting


bRepelling


cImpermeable


dPermeable


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


cSharp crested weir


dRectangular weir


View Answer Non-gravity weir

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


aPond level


bHFL


cAfflux


dFSL


View Answer Afflux

Silt free water should be supplied to the canals through______________________?


aUnder sluices


bHead sluices


cScouring sluices


dSluice gates


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


bRetaining wall


cToe wall


dAll are correct


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


b2.5 – 3.0 m/sec


c3.0 – 3.5 m/sec


d3.5 – 4.0 m/sec


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


bBreast wall


cDivide wall


dCantilever wall


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


bSilt ejectors


cVortex pipes


dSilt control structures


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


bFinal depth


cSequent depth


dDown stream water depth


View Answer Sequent depth

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


aStable


bRocky


cImpermeable


dPermeable


View Answer Permeable

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