1941. For an annual flood series arranged in descending order of magnitude, the return for a magnitude listed at position period m in a total data N is________________?

A. N/(m+l)
B. m/(N+l)
C. m/N
D. (N+l)/m
✅ The correct answer is option D.

1943. Coefficient of discharge of an ogee spillway________________?

A. depends on depth of approach and upstream slope
B. depends on downstream apron interference and downstream submergence
C. remains constant
D. both (A) and (B)
✅ The correct answer is option D.

1947. The main function of a divide wall is to_______________?

A. control the silt entry in the canal
B. prevent river floods from entering the canal
C. separate the undersluices from weir proper
D. provide smooth flow at sufficiently low velocity
✅ The correct answer is option C.

1948. The unit hydrograph of a specified duration can be used to evaluate the hydrograph of storms of_________________?

A. same duration only
B. same and shorter duration
C. same and longer duration
D. any duration
✅ The correct answer is option D.