Fluid Mechanics MCQs

168. In case of laminar flow of fluid through a circular pipe, the

Shear stress over the cross-section is proportional to the distance from the surface of the pipe
Surface of velocity distribution is a paraboloid of revolution, whose volume equals half the volume of circumscribing cylinder
Velocity profile varies hyperbolically and the shear stress remains constant over the cross-section
Average flow occurs at a radial distance of 0.5 r from the centre of the pipe (r = pipe radius)
✅ The correct answer is option B.

169. Cavitation can be prevented by

Suitably designing the pump
Maintaining the suction head sufficiently greater than the vapour pressure
Maintaining suction head = developed head
Maintaining suction head lower than the vapour pressure
✅ The correct answer is option B.
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