## PEC EPE Exam Fluid Mechanics MCQ Questions – Civil Engineering

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Fluid mechanics deals with the study of:

a) Solid mechanics

b) Behavior of gases only

c) Behavior of liquids only

d) Behavior of both liquids and gases

Answer: d) Behavior of both liquids and gases

The SI unit of dynamic viscosity is:

a) Pascal-second (Paยทs)

b) Poise (P)

c) Newton (N)

d) Pascal (Pa)

Answer: a) Pascal-second (Paยทs)

The property of a fluid by which it resists its own deformation under the application of shear stress is called:

a) Kinematic viscosity

b) Compressibility

c) Dynamic viscosity

d) Surface tension

Answer: c) Dynamic viscosity

Which law of fluid mechanics states that the volume of a given mass of gas is inversely proportional to its pressure, assuming constant temperature?

a) Boyle’s Law

b) Charles’s Law

c) Pascal’s Law

d) Archimedes’ Principle

Answer: a) Boyle’s Law

The pressure exerted by a fluid at rest is transmitted undiminished in all directions. This statement is known as:

a) Boyle’s Law

b) Charles’s Law

c) Pascal’s Law

d) Bernoulli’s Principle

Answer: c) Pascal’s Law

The center of pressure on a submerged vertical plane surface is located:

a) At the top of the surface

b) At the bottom of the surface

c) At the centroid of the surface

d) It varies depending on the fluid velocity

Answer: c) At the centroid of the surface

Which type of flow occurs when the fluid particles move in parallel lines with constant velocity at any given instant?

a) Laminar flow

b) Turbulent flow

c) Steady flow

d) Unsteady flow

Answer: c) Steady flow

The pressure at a point in a fluid at rest depends only on:

a) The density of the fluid

b) The velocity of the fluid

c) The height of the fluid above the point

d) The shape of the container containing the fluid

Answer: c) The height of the fluid above the point

The velocity of a fluid flowing through a pipe is highest at:

a) The center of the pipe

b) The pipe’s wall

c) The top of the pipe

d) The bottom of the pipe

Answer: a) The center of the pipe

The flow in which the fluid particles follow a smooth, continuous path in a straight line is called:

a) Laminar flow

b) Turbulent flow

c) Compressible flow

d) Incompressible flow

Answer: a) Laminar flow

The ratio of the density of a fluid to the density of a standard fluid is called:

a) Dynamic viscosity

b) Specific gravity

c) Kinematic viscosity

d) Reynolds number

Answer: b) Specific gravity

The pressure exerted by a fluid at rest increases with:

a) An increase in the fluid’s velocity

b) An increase in the fluid’s density

c) An increase in the fluid’s elevation

d) A decrease in the fluid’s temperature

Answer: c) An increase in the fluid’s elevation

The force acting on a surface in contact with a fluid is perpendicular to the surface. This force is known as:

a) Shear force

b) Tensile force

c) Normal force

d) Bending force

Answer: c) Normal force

The pressure at a point in a fluid at rest is the same in all directions. This statement is known as:

a) Archimedes’ Principle

b) Bernoulli’s Principle

c) Pascal’s Law

d) Hooke’s Law

Answer: c) Pascal’s Law

The total energy of a fluid flowing in a streamline is the sum of:

a) Pressure energy and kinetic energy

b) Pressure energy and potential energy

c) Kinetic energy and potential energy

d) Pressure energy, kinetic energy, and potential energy

Answer: d) Pressure energy, kinetic energy, and potential energy

The type of flow in which the fluid particles move in a random manner with irregular fluctuations in velocity is called:

a) Laminar flow

b) Turbulent flow

c) Steady flow

d) Unsteady flow

Answer: b) Turbulent flow

The flow in which the fluid particles follow irregular paths is called:

a) Laminar flow

b) Turbulent flow

c) Steady flow

d) Unsteady flow

Answer: b) Turbulent flow

The velocity of a fluid flowing through a pipe is lowest at:

a) The center of the pipe

b) The pipe’s wall

c) The top of the pipe

d) The bottom of the pipe

Answer: b) The pipe’s wall

The flow in which the fluid particles move randomly in all directions with respect to time and space is called:

a) Laminar flow

b) Turbulent flow

c) Steady flow

d) Unsteady flow

Answer: d) Unsteady flow

The change in pressure between two points in a fluid flowing through a pipe is given by:

a) Bernoulli’s equation

b) Poiseuille’s equation

c) Darcy’s equation

d) Pascal’s equation

Answer: a) Bernoulli’s equation