# Hydraulics and Fluid Mechanics MCQ

Civil engineering MCQ and hydraulics and mechanics MCQ for competitive exam.

## Q. 1 In open channels, the specific energy is the

A. Total energy measured above the horizontal datum

B. Total energy per unit discharge

C. Total energy measured with respect to the datum passing through the bottom of the channel

D. Kinetic energy plotted above the free surface of water

C. Total energy measured with respect to the datum passing through the bottom of the channel

## Q. 2 For a floating body to be in stable equilibrium, its metacentre should be

A. Below the center of buoyancy

B. Above the center of buoyancy

C. Below the center of gravity

D. Above the center of gravity

D. Above the center of gravity

A. 2.89 kN

B. 9.28 kN

C. 8.29 kN

D. 28.9 kN

B. Fat lime

A. 2000 kg

B. 4000 kg

C. 8000 kg

D. 1000 kg

D. 1000 kg

A. None of these

B. Neutral

C. Stable

D. Unstable

B. Neutral

## Q. 6 A streamline is defined as the line

A. Along which the pressure drop is uniform

B. Of equal velocity in a flow

C. Parallel to central axis flow

D. Parallel to outer surface of pipe

B. Of equal velocity in a flow

## Q. 7 The flow in a pipe or channel is said to be non-uniform when

A. The quantity of liquid flowing per second is constant

B. The liquid particles at all sections have the same velocities

C. The liquid particles at different sections have different velocities

D. Each liquid particle has a definite path

C. The liquid particles at different sections have different velocities

## Q. 8 Hydrometer is used to determine

A. Specific gravity of gases

B. Relative humidity

C. Specific gravity of liquids

D. Specific gravity of solids

C. Specific gravity of liquids

## Q. 9 The dynamic viscosity of the liquid ____ with rise in temperature.

A. Decreases

B. Remain unaffected

C. Increases

D. None of these

A. Decreases

## Q. 10 For pipes, turbulent flow occurs when Reynolds number is

A. Less than 4000

B. Less than 2000

C. Between 2000 and 4000

D. More than 4000

D. More than 4000

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