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 (Pa·s)
b) Poise (P)
c) Newton (N)
d) Pascal (Pa)
Answer: a) Pascal-second (Pa·s)
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