50. In fluids, steady flow occurs when

A. conditions of flow change steadily with time

B. conditions of flow do not change with time at a point

C. conditions of flow remain the same at adjacent point

D. velocity vector remains constant at a point.

51. Uniform flow is said to occur when

A. size and shape of the cross-section in a particular length remain constant

B. size and shape of the cross-section change along a length

C. frictional loss in the particular length of the channel will the more than the drop in its elevation

D. frictional loss in the particular length of the channel, will be less than the drop in elevation.

52. If velocities of fluid particles vary from point to point in magnitude and direction, as well as from instant to instant, the flow is said to be

A. laminar

B. turbulent flow

C. uniform flow

D. non-uniform flow.

53. A steady uniform flow is through

A. a long pipe at decreasing rate

B. a long pipe at constant rate

C. an expanding tube at constant rate

D. an expanding tube at increasing rate

54. A non-uniform steady flow is through

A. a long tube at a decreasing rate

B. an expanding tube at constant rate

C. an expanding tube at increasing rate

D. a long pipe at increasing rate.

55. An ideal flow of a liquid obeys

A. Continuity equation

B. Newton's law of viscosity

C. Newton's second law of motion

D. dynamic viscosity law.

56. The continuity equation

A. expresses the relationship between work and energy

B. relates the momentum per unit volume between two points on a stream line

C. relates mass rate of flow along a stream line

D. requires that Newton's second law of motion be satisfied at every point in fluid.

Page **8** of **61**