# Hydraulics and Fluid Mechanics MCQ

## Q. 21 Select the correct statement

A. Local atmospheric pressure is always below standard atmospheric pressure

B. Local atmospheric pressure depends upon elevation of locality only

C. Standard atmospheric pressure is the mean local atmospheric pressure at sea level

D. A barometer reads the difference between local and standard atmospheric

C. Standard atmospheric pressure is the mean local atmospheric pressure at sea level

## Q. 22 The shear stress-strain graph for a Newtonian fluid is a

A. Hyperbolic curve

B. Elliptical

C. Straight line

D. Parabolic curve

C. Straight line

## Q. 23 The flow in which the particles of a fluid attain such velocities that varies from point to point in magnitude and direction as well as from instant to instant, is known as

B. One dimensional flow

C. Uniform flow

D. Turbulent flow

D. Turbulent flow

## Q. 24 For a perfect incompressible liquid, flowing in a continuous stream, the total energy of a particle remains the same, while the particle moves from one point to another. This statement is called

A. Continuity equation

B. Archim edes’s principle

C. Bernoulli’s equation

D. Pascal’s law

C. Bernoulli’s equation

## Q. 25 A flow is called super-sonic if the

A. Mach number is between 1 and 6

B. Velocity of flow is very high

C. Discharge is difficult to measure

D. None of these

A. Mach number is between 1 and 6

## Q. 26 Uniform flow occurs when

A. The magnitude and direction of the velocity do not change from point to point in the fluid

B. The fluid particles move in-plane or parallel planes and the streamline patterns are identical in each pleasure

C. The velocity of successive fluid particles, at any point, is the same at successive periods of time

D. The velocity of successive fluid particles, at any point, is the same at successive periods of time

A. The magnitude and direction of the velocity do not change from point to point in the fluid

A. (qÂ³/g)1/4

B. (q/g)1/2

C. (q4/g)1/4

D. (qÂ²/g)1/3

D. (qÂ²/g)1/3

## Q. 28 At the center line of a pipe flowing under pressure where the velocity gradient is zero, the shear stress will be

A. Could be any value

B. Minimum

C. Maximum

D. Zero

A. Could be any value

## Q. 29 The discharge through a channel of trapezoidal section is maximum when

A. Depth of channel is equal to the width at the bottom

B. The sloping side is equal to half the width at the top

C. Width of channel at the top is equal to twice the width at the bottom

D. The sloping side is equal to the width at the bottom

B. The sloping side is equal to half the width at the top

## Q. 30 Piezometer is used to measure

A. Difference of pressure between two points

B. Pressure in pipe, channels etc.

C. Atmospheric pressure

D. Very low pressures

D. Very low pressures

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