1931. Main purpose of mean water training for rivers is________________?

A. flood control
B. to provide sufficient depth of water in navigable channels, during low water periods
C. to preserve the channel in good shape by efficient disposal of suspended and bed load
D. all of the above
βœ… The correct answer is option C.

1933. The flow-mass curve is graphical representation of__________________?

A. cumulative discharge and time
B. discharge and percentage probability of flow being equaled or exceeded
C. cumulative discharge, volume and time in chronological order
D. discharge and time in chronological order
βœ… The correct answer is option C.

1936. With the increase in the quantity of water supplied, the yield of most crops_________________?

A. increases continuously
B. decreases continuously
C. increases upto a certain limit and then becomes constant
D. increases upto a certain limit and then decreases
βœ… The correct answer is option D.

1940. Generally the weir is aligned at right angles to the direction of the main river current because______________?

A. it ensures less length of the weir
B. it gives better discharging capacity
C. it is economical
D. all of the above
βœ… The correct answer is option D.