MCQ Questions and Answers on Fluid Mechanics

Q.

Minor losses in a piping system are

A. Less than the friction factor losses

B. Due to the viscous stresses

C. Assumed to vary linearly with the velocity

D. Found by using loss coefficients

Discuss

Answer : Option:- D

Explanation :

Minor losses in a piping system are directly calculated by using loss coefficients.

Q.

For laminar flow through a long pipe, the pressure drop per unit length increases

A. In linear proportion to the cross-sectional area

B. In proportion to the diameter of the pipe

C. In inverse proportion to the cross-sectional area

D. In inverse proportion to the square of crosssectional area

Discuss

Answer : Option:- C

Explanation :

Discuss here! No Explaination Available for These Question.

Q.

The viscosity in a fluid is caused mainly by

A. Intermolecular force of cohesion

B. Molecular momentum exchange

C. Both A and B

D. None of the above

Discuss

Answer : Option:- C

Explanation :

The viscosity in a fluid is caused mainly by intermolecular force of cohesion and molecular momentum exchange.

Q.

In hydrostatics, it is observed that total weight of the water in the tank is much less than the total pressure on the bottom of the tank. This is known as

A. Pascal's paradox

B. Newton's paradox

C. Stokes paradox

D. Archimedes' principle

Discuss

Answer : Option:- A

Explanation :

Discuss here! No Explaination Available for These Question.

Q.

Laminar sublayer can develop during flow over a flat plate. It exists in

A. Laminar zone

B. Transition zone

C. Turbulent zone

D. Laminar and transition zones

Discuss

Answer : Option:- C

Explanation :

In turbulent zone, in immediate vicinity of boundary, there also exists a laminar sub-layer with linear velocity distribution and extreme velocity gradient.

Q.

The continuity equation for a steady flow states that

A. Velocity field is continuous at all points in flow field

B. The velocity is tangential to the streamlines

C. The stream function exists for steady flows

D. The efflux rate of mass through the control surface is zero

Discuss

Answer : Option:- D

Explanation :

Discuss here! No Explaination Available for These Question.

Q.

Newton's law of viscosity relates

A. Velocity gradient and rate of shear strain

B. Rate of shear deformation and shear stress

C. Shear deformation and shear stress

D. Pressure and volumetric strain

Discuss

Answer : Option:- B

Explanation :

According to the Newton’s law of viscosity, the shear stress between two fluid layers is proportional to the rate of shear stress.

Q.

If a block of ice, floating over water in a vessel, slowly melts in it, then water level in the vessel will

A. Decrease

B. Increase

C. Remains same

D. All of the above

Discuss

Answer : Option:- C

Explanation :

If a block of ice, floating over water in a vessel, slowly melts in it, then water level in the vessel remains the same.

Q.

The locus of elevations that water will rise in a series of pitot tubes is called

A. The hydraulic grade line

B. The energy grade line

C. The velocity head

D. The pressure head

Discuss

Answer : Option:- C

Explanation :

The rise of elevation in pitot tube is equal to the velocity head.

Q.

According to Archimedes' principle, when a body is immersed in a fluid either partially or totally, it is lifted up by a force equal to the

A. Weight of the the body

B. Weight of the fluid volume equal to the body

C. Weight of the fluid displaced by the body

D. None of the above

Discuss

Answer : Option:- C

Explanation :

Archimedes principle states that when a body is immersed in a fluid either partially or totally, it is lifted up by a force equal to the weight of the fluid displaced by the body.

MCQ Questions and Answers on Fluid Mechanics

Q. Minor losses in a piping system are

Q. For laminar flow through a long pipe, the pressure drop per unit length increases

Q. The viscosity in a fluid is caused mainly by

Q. In hydrostatics, it is observed that total weight of the water in the tank is much less than the total pressure on the bottom of the tank. This is known as

Q. Laminar sublayer can develop during flow over a flat plate. It exists in

Q. The continuity equation for a steady flow states that

Q. Newton's law of viscosity relates

Q. If a block of ice, floating over water in a vessel, slowly melts in it, then water level in the vessel will

Q. The locus of elevations that water will rise in a series of pitot tubes is called

Q. According to Archimedes' principle, when a body is immersed in a fluid either partially or totally, it is lifted up by a force equal to the

Q.

Minor losses in a piping system are

Q.

For laminar flow through a long pipe, the pressure drop per unit length increases

Q.

The viscosity in a fluid is caused mainly by

Q.

In hydrostatics, it is observed that total weight of the water in the tank is much less than the total pressure on the bottom of the tank. This is known as

Q.

Laminar sublayer can develop during flow over a flat plate. It exists in

Q.

The continuity equation for a steady flow states that

Q.

Newton's law of viscosity relates

Q.

If a block of ice, floating over water in a vessel, slowly melts in it, then water level in the vessel will

Q.

The locus of elevations that water will rise in a series of pitot tubes is called

Q.

According to Archimedes' principle, when a body is immersed in a fluid either partially or totally, it is lifted up by a force equal to the