A weir is said to be narrow-crested weir, if the width of the crest of the weir is __________ half the height of water above the weir crest.

A. bottom surface of the body
B. e.g. of the body
C. metacentre
D. all points on the surface of the body
E. all of the above

A. compressibility
B. surface tension
C. cohesion
D. adhesion
E. viscosity.

A. less man the vapour pressure over the plane surface
B. equal to the vapour pressure over the plane surface
C. greater than the vapour pressure over the plane surface
D. zero
E. none of the above

A. viscosity
B. osmosis
C. surface tension
D. cohesion
E. diffusivity