791. 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__________________?

A. Non-gravity weir
B. Gravity weir
C. Sharp crested weir
D. Rectangular weir

792. The groyne pointing upwards direction of flow is called ______________________?

A. Attracting
B. Repelling
C. Impermeable
D. Permeable

793. when ever a sloping face of river bank is protected by stone pitching against scour, the pitching is extended beyond the toe to the river side that is called__________________?

A. Toe wall
B. Launching apron
C. Protective wall
D. Guide bank

794. In a river the flood water dries up before it joins the sea or any other river, such river is called ________________?

A. Flashy
B. Virgin
C. Tidal
D. Deltaic

795. A river before its joins the sea, gets divided into small channels, thus forming a Triangular shape called __________________?

A. Unstable river
B. Deltaic river
C. Stable river
D. Degrading river

796. If a river or stream is collecting sediment and is building up dunes in its bed is called ______________________?

A. Stable river
B. Sub-stable river
C. Aggrading river
D. Sediment river

797. 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___________________?

A. 2.0 – 2.5 – m/sec
B. 2.5 – 3 m/sec
C. 3.0 – 3.5 m/sec
D. 3.5 – 4.0 m/sec

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

A. Divide wall
B. Retaining wall
C. Toe wall
D. All are correct

799. Silt free water should be supplied to the canals through______________________?

A. Under sluices
B. Head sluices
C. Scouring sluices
D. Sluice gates

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

A. Pond level
C. Afflux


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