# Fluid Dynamics MCQs with Answers

Fluid Dynamics MCQs are very important test and often asked by various testing services and competitive exams around the world. Here you will find all the Important Fluid Dynamics MCQs for Preparation.

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## Fluid Dynamics Online MCQs with Answers

Fluid dynamics is the study of:
a) Motion of solids
b) Motion of gases only
c) Motion of liquids only
d) Motion of both liquids and gases

d) Motion of both liquids and gases

Which of the following properties of a fluid determines its resistance to flow?
a) Viscosity
b) Density
c) Pressure
d) Temperature

a) Viscosity

The equation of continuity in fluid dynamics states that:
a) The pressure in a fluid is constant at all points
b) The velocity of a fluid is constant at all points
c) The mass flow rate of a fluid is constant at all points
d) The volume flow rate of a fluid is constant at all points

c) The mass flow rate of a fluid is constant at all points

Bernoulli’s equation relates which of the following properties of a fluid?
a) Pressure, density, and velocity
b) Pressure, viscosity, and velocity
c) Pressure, temperature, and velocity
d) Pressure, density, and viscosity

a) Pressure, density, and velocity

The phenomenon of lift in aerodynamics is explained by:
a) Archimedes’ principle
b) Pascal’s principle
c) Bernoulli’s principle
d) Boyle’s law

c) Bernoulli’s principle

The Reynolds number is used to determine the:
a) Viscosity of a fluid
b) Density of a fluid
c) Pressure of a fluid
d) Flow regime of a fluid

d) Flow regime of a fluid

The property of a fluid that resists its deformation under shear stress is called:
a) Viscosity
b) Surface tension
c) Density
d) Compressibility

a) Viscosity

Pascal’s principle states that:
a) The pressure of a fluid increases with depth
b) The pressure of a fluid is transmitted uniformly in all directions
c) The pressure of a fluid is inversely proportional to its volume
d) The pressure of a fluid is directly proportional to its velocity

b) The pressure of a fluid is transmitted uniformly in all directions

The surface tension of a liquid is a result of:
a) Cohesive forces between the liquid molecules
b) Adhesive forces between the liquid and another surface
c) The density of the liquid
d) The temperature of the liquid

a) Cohesive forces between the liquid molecules

The motion of a fluid in a curved path due to the presence of a centripetal force is known as:
a) Vorticity
b) Turbulence
c) Laminar flow
d) Rotational flow

d) Rotational flow

The measure of a fluid’s resistance to flow is known as:
a) Viscosity
b) Compressibility
c) Surface tension
d) Density

a) Viscosity

The velocity profile in a laminar flow is:
a) Parabolic
b) Flat
c) Uniform
d) Irregular

a) Parabolic

The equation of motion in fluid dynamics is also known as:
a) Euler’s equation
b) Bernoulli’s equation
c) Reynolds equation
d) Navier-Stokes equation

d) Navier-Stokes equation

The point at which the velocity of a fluid becomes zero in a flow is known as:
a) Stagnation point
b) Critical point
c) Separation point
d) Convergence point

a) Stagnation point

The coefficient of viscosity for a fluid is a measure of its:
a) Resistance to shear stress
b) Pressure
c) Velocity
d) Density

a) Resistance to shear stress

The ratio of the density of a fluid to the density of a reference fluid (usually water) is called:
a) Viscosity
b) Reynolds number
c) Specific gravity
d) Mach number

c) Specific gravity

The streamline flow of a fluid is characterized by:
a) Smooth, parallel flow lines
b) Turbulent flow patterns
c) Irregular flow patterns
d) Reverse flow

a) Smooth, parallel flow lines

The study of fluid flow in motion is known as:
a) Hydrodynamics
b) Thermodynamics
c) Fluid mechanics
d) Fluid statics

a) Hydrodynamics

The rate of change of momentum of a fluid is equal to the net force acting on it. This statement is known as:
a) Newton’s first law
b) Newton’s second law
c) Newton’s third law
d) Conservation of momentum

b) Newton’s second law

The drag force experienced by an object moving through a fluid is dependent on the:
a) Velocity of the fluid
b) Density of the fluid
c) Surface area of the object
d) All of the above

d) All of the above

The flow of a fluid in which the velocity and pressure do not change with time is known as:
c) Turbulent flow
d) Laminar flow

The lift force on an object moving through a fluid is dependent on the:
a) Viscosity of the fluid
b) Density of the fluid
c) Surface area of the object
d) Velocity of the object

c) Surface area of the object

The force per unit area exerted by a fluid at a given point is called:
a) Pressure
b) Density
c) Viscosity
d) Surface tension

a) Pressure

The change in pressure across a fluid flow is directly proportional to the:
a) Density of the fluid
b) Velocity of the fluid
c) Viscosity of the fluid
d) Surface tension of the fluid

b) Velocity of the fluid

The phenomenon in fluid dynamics where the flow becomes chaotic and unpredictable is known as:
a) Turbulence
b) Laminar flow
c) Vorticity
d) Incompressibility

a) Turbulence

The point at which the flow of a fluid separates from a surface is known as:
a) Stagnation point
b) Critical point
c) Separation point
d) Convergence point

c) Separation point

The phenomenon in fluid dynamics where a fluid flows faster in a constricted area, causing a decrease in pressure, is known as:
a) Venturi effect
b) Bernoulli effect
c) Coanda effect
d) Pascal effect

b) Bernoulli effect

The buoyant force experienced by an object submerged in a fluid is equal to the:
a) Weight of the object
b) Volume of the object
c) Density of the fluid
d) Pressure of the fluid

a) Weight of the object

The property of a fluid that describes its resistance to compression is called:
a) Viscosity
b) Density
c) Surface tension
d) Compressibility

d) Compressibility

The streamlines of a fluid flow are perpendicular to the:
a) Velocity vector
c) Viscosity
d) Compressibility

a) Velocity vector

The term “turbulent flow” refers to a fluid flow that is:
a) Chaotic and unpredictable
b) Smooth and laminar
d) Compressible and incompressible

a) Chaotic and unpredictable

The dynamic viscosity of a fluid is a measure of its:
a) Resistance to flow
b) Ability to conduct heat
c) Tendency to evaporate
d) Response to external forces

a) Resistance to flow

The flow of a fluid in which the velocity and pressure vary with time is known as:
c) Laminar flow
d) Turbulent flow

The study of the behavior of fluids at rest is known as:
a) Hydrodynamics
b) Aerodynamics
c) Fluid mechanics
d) Fluid statics

d) Fluid statics

The property of a fluid that describes its resistance to shear stress is known as:
a) Viscosity
b) Density
c) Surface tension
d) Compressibility

a) Viscosity

The rate of flow of a fluid through a given area is known as:
a) Velocity
b) Pressure
c) Volume flow rate
d) Mass flow rate

c) Volume flow rate

The study of the forces and motion of fluids in a gravitational field is known as:
a) Hydrostatics
b) Aerostatics
c) Hydrodynamics
d) Aerodynamics

a) Hydrostatics

The term “boundary layer” refers to the:
a) Layer of fluid adjacent to a solid surface where fluid velocity changes rapidly
b) Layer of fluid at the surface of a liquid in contact with another material
c) Layer of fluid where laminar flow transitions to turbulent flow
d) Layer of fluid where flow separation occurs

a) Layer of fluid adjacent to a solid surface where fluid velocity changes rapidly

The drag force experienced by an object moving through a fluid is directly proportional to the:
a) Velocity of the object
b) Density of the fluid
c) Surface area of the object
d) Viscosity of the fluid

c) Surface area of the object

The study of the behavior of gases is known as:
a) Gas dynamics
b) Thermodynamics
c) Fluid dynamics
d) Fluid mechanics

a) Gas dynamics

The pressure difference across a fluid flow is directly proportional to the:
a) Velocity of the fluid
b) Density of the fluid
c) Viscosity of the fluid
d) Surface tension of the fluid

b) Density of the fluid

The force per unit area exerted by a fluid at rest is called:
a) Pressure
b) Density
c) Viscosity
d) Surface tension

a) Pressure

The pressure in a fluid increases with depth due to:
a) Buoyancy
b) Viscosity
c) Surface tension
d) Hydrostatic pressure

d) Hydrostatic pressure

The resistance of a fluid to flow is primarily determined by its:
a) Density
b) Pressure
c) Temperature
d) Viscosity

d) Viscosity

The velocity of a fluid increases as it passes through a constricted area due to:
a) Viscosity
b) Turbulence
c) Bernoulli’s principle
d) Compressibility

c) Bernoulli’s principle

The phenomenon of cavitation occurs when:
a) The velocity of a fluid increases beyond the speed of sound
b) A fluid changes phase from gas to liquid
c) The pressure in a fluid drops below its vapor pressure
d) The flow of a fluid becomes turbulent

c) The pressure in a fluid drops below its vapor pressure

The flow of a fluid in which the velocity and pressure remain constant at all points is known as:
c) Laminar flow
d) Turbulent flow

The flow of a fluid in which the velocity and pressure vary with position is known as:
c) Laminar flow
d) Turbulent flow

c) Laminar flow

The phenomenon in fluid dynamics where a fluid flows parallel to a solid boundary without any mixing or crossing of streamlines is known as:
a) Turbulent flow
b) Viscous flow
c) Laminar flow
d) Compressible flow

c) Laminar flow

The study of the behavior of gases in motion is known as:
a) Gas dynamics
b) Thermodynamics
c) Fluid dynamics
d) Fluid mechanics

a) Gas dynamics

The study of the forces and motion of fluids at rest is known as:
a) Hydrodynamics
b) Thermodynamics
c) Fluid dynamics
d) Fluid statics

d) Fluid statics

The pressure at a point in a fluid is:
a) The same in all directions
b) Higher at the bottom of the fluid column
c) Lower at the bottom of the fluid column
d) Dependent on the velocity of the fluid

a) The same in all directions

The phenomenon in fluid dynamics where a fluid flows in parallel layers with no mixing between the layers is known as:
a) Turbulence
b) Laminar flow
c) Vorticity
d) Incompressibility

b) Laminar flow

The measure of a fluid’s resistance to flow is known as:
a) Viscosity
b) Compressibility
c) Surface tension
d) Density

a) Viscosity

The force per unit area exerted by a fluid on a surface perpendicular to the flow is called:
a) Pressure
b) Viscosity
c) Surface tension
d) Density

a) Pressure

The property of a fluid that describes its tendency to resist a change in shape is known as:
a) Viscosity
b) Density
c) Surface tension
d) Compressibility

a) Viscosity

The flow of a fluid in which the velocity and pressure vary randomly with time is known as:
c) Laminar flow
d) Turbulent flow

d) Turbulent flow

The study of the motion and behavior of fluids is known as:
a) Hydrodynamics
b) Thermodynamics
c) Fluid dynamics
d) Fluid mechanics

c) Fluid dynamics

The flow of a fluid in which the velocity and pressure vary periodically with time is known as:
c) Laminar flow
d) Oscillatory flow