Hydraulics and Fluid Mechanics in ME
Capillary action is due to the

Cohesion of the liquid
Adhesion of the liquid molecules and the molecules on the surface of a solid
Surface tension
All of the listed here

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Hydraulics and Fluid Mechanics in ME
A floating body is said to be in a state of stable equilibrium

when the metacentre is above the centre of gravity
when its metacentric height is zero
only when its centre of gravity is below its centre of buoyancy
when the metacentre is below the centre of gravity

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Hydraulics and Fluid Mechanics in ME
Surface tension

Is also known as capillarity
Decreases with fall in temperature
Is a function of the curvature of the interface
Acts in the plane of the interface normal to any line in the surface

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Hydraulics and Fluid Mechanics in ME
When a liquid is flowing through a pipe, the velocity of the liquid is

Maximum at the centre and minimum near the walls
Minimum at the centre and maximum near the walls
Zero at the centre and maximum near the walls
Maximum at the centre and zero near the walls

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