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251.

Euler's equation of motion can be integrated when it is assumed that

A.	The fluid is incompressible	B.	Bernoulli's satisfied
C.	Continrity equation is satisfied	D.	Velocity potential exists and the density is constant
E.	The flow is rotational

252.

Navier-stokes equation is useful in the analysis of

A.	Viscous flow	B.	Non-viscous flow
C.	Rotational flow	D.	Turbulent flow
E.	Any of the above

253.

For hydrodynamically rough boundary the friction coefficient

A.	Remains constant	B.	Varies with Reynold's number
C.	Depends on relative roughness	D.	Depends on Reynolds number, pressure gradient and relative roughness
E.	Depends on velocity and relative roughness

254.

Stremlines, streak lines and path lines are all identical in case of

A.	Uniform flow	B.	Non-uniform flow
C.	Rotation flow	D.	Steady flow
E.	Unsteady flow

255.

An equipotential line

A.	Has no velocity component tangent to it	B.	Has uniformly varying dynamic pressure
C.	Has no velocity component normal to it	D.	Exists in case of rotational flow
E.	Exists in case of turbulent flow only

256.

In laminar flow through a pipe, discharge varies

A.	Linearly as the viscosity	B.	Linearly as pipe diameter
C.	Inversely s the viscosity	D.	Linearly as the pressure drop
E.	None of the above

257.

The terminal velocity of a small sphere setting in a viscous fluid varies as the

A.	Inverse of the diameter	B.	Inverse square of the diameter
C.	Fluid viscosity	D.	Inverse of the fluid viscosity
E.	None of the above

258.

A right circular cylinder open at the top is filled with liquid (specific gravity 1.2) and rotated about its vertical axis at such speed that half the liquid spills out. The pressure at centre of the bottom is

A.	Zero	B.	One eighth of its value when cylinder was full
C.	One fourth of its value when cylinder was full	D.	Half of its value when cylinder was full
E.	Same as before rotation

259.

The motion of a fluid in which the fluid mass rotates without the external force is known as

A.	Rotary motion	B.	Circulatory motion
C.	Irrotational motion	D.	Free vortex motion
E.	Forced vortex motion

260.

A tank 2 m square contains one metre of water. Now the tank is accelerated in the horizontal direction parallel to a pair of sides at the rate of 4 m/sec2. In order that there may be no spilling of water the minimum height of the tank should be

A.	1 m	B.	1.41 m
C.	2 m	D.	2.32 m
E.	4 m