Civil Engineering Fluid Mechanics MCQs with answers for test preparation. Includes basic Fluid Dynamics MCQs for competitive exams. Download Fluid Mechanics questions and answers PDF, Fluid Mechanics questions and solutions PDF, and Fluid Mechanics MCQs PDF.

## Pressure variation for compressible fluid is maximum for which of the following kind of process ?

**A. Isothermal**B. Adiabatic

C. Quasi Static

D. None of themDue to constant temperature, pressure variation for compressible fluid is maximum for isothermal process.

## Which of the following is a type of fluid based on viscosity ?

A. Ideal Fluid

B. Ideal Fluid

C. Real Fluid**D. All of the mentioned****Explanation**: Fluid based on viscosity:

i) Real Fluid

ii) Ideal Fluid

iii) Newtonian Fluid

iv) Non-Newtonian Fluid

v) Ideal Plastic Fluid## Open channel flow takes place ______.

A. In the pipe

**B. On a free surface**C. In a pump

D. Within a cylindrical depthOpen channel flow is a flow that deals with hydraulics in fluid mechanics. It is a type of liquid flow that flows through a free surface.

## Principle of fluid mechanics works on the utilization of:

**A. Work**B. Volume

C. Velocity

D. Accelerating massThe Principle of fluid mechanics works on the utilization of useful work

## The compressible flow is assumed to be:

**A. Isentropic only**B. Polytropic

C. Adiabatic only

D. Isentropic and adiabatic## When a fluid is subjected to resistance, it undergoes a volumetric change due to:

A. Adhesion

**B. Compressibility**C. Cohesion

D. StrainCompressibility is defined as a measure of relative change in volume of a fluid. In fluid mechanics, it is also called as isothermal compressibility due to increase in pressure and temperature.

## Which of the following is a formula for the friction factor of circular pipes ?

A. 16/Re

B. Re/16

C. Re/64**D. 64/Re**Circular pipes have a diameter treated in a round manner. For a fluid flow which is laminar head loss is directly proportional to the fluid velocity. Thus, friction factor is inversely proportional to its velocity. Therefore, the correct option is ‘64/Re’.

## Which among the following is an assumption of Hagen-Poiseuille equation ?

A. Fluid is turbulent

B. Fluid is compressible**C. Fluid is laminar**D. Fluid is uniform## Which of the following equation must be perfunctorily satisfied while dealing with fluid flow problems ?

A. Law of conservation of momentum

B. Newton’s second law

C. Newton’s third law**D. Continuity equation**Continuity equation must be perfunctorily satisfied while dealing with fluid flow problems.

## When the body is completely or partially immersed in a fluid, how much its weight be distributed for it to be in stable equilibrium.

**A. Around the lower part**B. Around the upper part

C. Is independent of weight distribution

D. None of the mentioned