## Hydraulics & Fluid Mechanics Free surface of a liquid behaves like a sheet and tends to contract to smallest possible area due to the

force of diffusion
force of cohesion
force of friction

## Hydraulics & Fluid Mechanics When a body floating in a liquid, is displaced slightly, it oscillates about

metacentre
e.g. of body
center of buoyancy
center of pressure

## Hydraulics & Fluid Mechanics A fluid is said to be ideal, if it is

inviscous and incompressible
inviscous and compressible
incompressible
inviscous

(i) and (ii)
(ii) and (iv)
(i)and(iv)
(ii) and (iii)

## Hydraulics & Fluid Mechanics At the centre line of a pipe flowing under pressure where the velocity gradient is zero, the shear stress will be

could be any value
minimum
negative value
maximum

## Hydraulics & Fluid Mechanics When a liquid rotates at a constant angular velocity about a vertical axis as a rigid body, the pressure intensity varies

as the square of the radial distance
inversely as the square of the radial distance