Fluid Mechanics Quizzes: Test Your Understanding of Fluid Dynamics

Question 1

The drag force acting on a sphere moving through a fluid is primarily proportional to:

Accepted Answer

Velocity and diameter

Answer

Diameter only

Answer

Velocity only

Answer

Viscosity only

Question 2

The Reynolds number is a dimensionless parameter used to characterize:

Accepted Answer

Flow regime (laminar or turbulent)

Answer

Fluid viscosity

Answer

Fluid density

Answer

Pipe diameter

Question 3

The Bernoulli equation relates:

Accepted Answer

Pressure, elevation, and velocity

Answer

Density, temperature, and pressure

Answer

Force, mass, and acceleration

Answer

Energy, power, and time

Question 4

Which of the following fluids is considered Newtonian?

Accepted Answer

Water

Answer

Honey

Answer

Silly putty

Answer

Blood

Question 5

Viscosity of a fluid is a measure of its:

Accepted Answer

Resistance to flow

Answer

Density

Answer

Compressibility

Answer

Specific gravity

Question 6

When a fluid exerts a uniform pressure (P) on a submerged surface with area (A), the resulting force (F) acting on the surface is:

Accepted Answer

F = PA

Answer

F = P/A

Answer

F = 1/PA

Answer

F = A/P

Question 7

Laminar flow is a type of fluid flow characterized by:

Accepted Answer

Smooth, orderly motion

Answer

Turbulent, chaotic motion

Answer

Compressible flow

Answer

Incompressible flow

Question 8

The dimensionless parameter that represents the ratio of inertial forces to viscous forces in a fluid is known as the:

Accepted Answer

Reynolds number

Answer

Froude number

Answer

Euler number

Answer

Mach number

Question 9

A venturimeter is primarily used for measuring:

Accepted Answer

Fluid flow rate

Answer

Fluid velocity

Answer

Fluid pressure

Answer

Fluid density

Question 10

When a fluid interacts with a flat plate, the type of drag that predominantly acts on the plate is:

Accepted Answer

Skin friction drag

Answer

Pressure drag

Answer

Induced drag

Answer

Wave drag

Question 11

The Bernoulli equation establishes a relationship between fluid:

Accepted Answer

Pressure, velocity, and height

Answer

Temperature, density, and viscosity

Answer

Force, mass, and acceleration

Answer

Energy, momentum, and time

Question 12

Which property is NOT characteristic of fluids?

Accepted Answer

Elasticity

Answer

Density

Answer

Viscosity

Answer

Surface tension

Question 13

Pressure at a point in a fluid is defined as:

Accepted Answer

Force exerted per unit area

Answer

Pressure gradient

Answer

Weight of fluid above

Answer

Fluid velocity

Question 14

The Reynolds number represents:

Accepted Answer

Flow regime

Answer

Pressure drop

Answer

Heat transfer rate

Answer

Fluid density

Question 15

The Navier-Stokes equations are used to model:

Accepted Answer

Viscous fluid flow

Answer

Ideal fluid flow

Answer

Heat transfer

Answer

Mass transfer

Question 16

The hydrostatic pressure at the bottom of a water tank is:

Accepted Answer

Proportional to the tank's height.

Answer

Independent of the tank's height.

Answer

Proportional to the tank's area.

Answer

Proportional to the tank's volume.

Question 17

Which equation expresses the conservation of mass in fluid flow?

Accepted Answer

Continuity equation

Answer

Bernoulli's equation

Answer

Navier-Stokes equations

Answer

Reynolds number

Question 18

Which dimensionless number characterizes the relative importance of viscous and inertial forces?

Accepted Answer

Reynolds number

Answer

Froude number

Answer

Mach number

Answer

Prandtl number

Question 19

The lift force on an airfoil is primarily caused by:

Accepted Answer

Pressure difference

Answer

Friction drag

Answer

Shear stress

Answer

Gravity

Question 20

The velocity profile in a pipe experiencing laminar flow is:

Accepted Answer

Parabolic

Answer

Linear

Answer

Exponential

Answer

Hyperbolic

Question 21

The force exerted by a fluid on a submerged body is called:

Accepted Answer

Buoyancy

Answer

Lift

Answer

Drag

Answer

Thrust

Question 22

Which method is used to numerically solve complex fluid mechanics problems?

Accepted Answer

Computational fluid dynamics (CFD)

Answer

Analytical methods

Answer

Experimental measurements

Answer

Dimensional analysis

Question 23

In fluid statics, pressure at a given point is independent of which factor?

Accepted Answer

Fluid velocity

Answer

Depth

Answer

Fluid density

Answer

Acceleration due to gravity

Question 24

Which flow conditions are analyzed using the Bernoulli equation?

Accepted Answer

Steady, incompressible flow

Answer

Unsteady, compressible flow

Answer

Laminar flow

Answer

Turbulent flow

Question 25

Which dimensionless parameter characterizes flow regime in fluid mechanics?

Accepted Answer

Reynolds number

Answer

Fluid density

Answer

Pipe diameter

Answer

Fluid velocity

Question 26

Identify the commonly used boundary condition in fluid mechanics problems:

Accepted Answer

No-slip condition

Answer

Slip condition

Answer

Zero pressure gradient condition

Answer

Periodic boundary condition

Question 27

What type of fluid has zero viscosity?

Accepted Answer

Ideal fluid

Answer

Newtonian fluid

Answer

Non-Newtonian fluid

Answer

Viscous fluid

Question 28

Which equation describes the conservation of mass for an incompressible fluid?

Accepted Answer

Continuity equation

Answer

Navier-Stokes equations

Answer

Euler equations

Answer

Bernoulli equation

Question 29

How does drag force on a submerged object vary with velocity?

Accepted Answer

Proportional to the square of the velocity

Answer

Proportional to the velocity

Answer

Proportional to the square root of the velocity

Answer

Independent of the velocity

Question 30

Which of the following is NOT considered a fluid property?

Accepted Answer

Buoyancy

Answer

Density

Answer

Viscosity

Answer

Temperature

Question 31

A fluid at rest exerts pressure:

Accepted Answer

Equally in all directions

Answer

Only downwards on the bottom surface of its container

Answer

Only on the side walls of its container

Answer

Only on the surface in contact with another fluid

Question 32

The equation of continuity for an incompressible fluid flowing through a pipe can be expressed as:

Accepted Answer

ρ₁A₁v₁ = ρ₂A₂v₂

Answer

ρ₁Q₁ = ρ₂Q₂

Answer

ρ₁Q₁ ≠ ρ₂Q₂

Answer

ρ₁A₁ ≠ ρ₂A₂

Question 33

The Reynolds number is a dimensionless parameter used to characterize:

Accepted Answer

Fluid flow regime

Answer

Fluid viscosity

Answer

Fluid density

Answer

Fluid temperature

Question 34

Which flow regime typically exhibits the lowest drag force?

Accepted Answer

Laminar

Answer

Transitional

Answer

Turbulent

Answer

Stokes

Question 35

The lift generated by an airfoil is primarily attributed to:

Accepted Answer

Pressure difference between the upper and lower surfaces

Answer

Viscosity of the fluid

Answer

Density of the fluid

Answer

Gravitational force

Question 36

The boundary layer in fluid mechanics refers to:

Accepted Answer

The region of fluid adjacent to a solid surface where viscous effects are significant

Answer

The region of fluid far from a solid surface where viscous effects are negligible

Answer

The region of fluid where turbulence is dominant

Answer

The region of fluid where pressure gradients are negligible

Question 37

Which fluid property represents the resistance of a fluid to flow?

Accepted Answer

Viscosity (Pa·s)

Answer

Density (kg/m³)

Answer

Surface tension (N/m)

Answer

Pressure (Pa)

Question 38

A fluid is considered to be incompressible if its...

Accepted Answer

Density does not change under pressure

Answer

Volume does not change under pressure

Answer

Velocity does not change under pressure

Answer

Temperature does not change under pressure

Question 39

The Bernoulli equation expresses the conservation of...

Accepted Answer

Energy

Answer

Mass

Answer

Momentum

Answer

Volume

Question 40

The dimensionless parameter that describes the ratio of inertial forces to viscous forces in a fluid flow is...

Accepted Answer

Reynolds number

Answer

Prandtl number

Answer

Nusselt number

Answer

Stanton number

Question 41

A cavitation occurs when...

Accepted Answer

Fluid pressure drops below its vapor pressure

Answer

Fluid pressure increases above its vapor pressure

Answer

Fluid temperature drops below its freezing point

Answer

Fluid velocity increases above its critical value

Question 42

Which property is NOT characteristic of a fluid?

Accepted Answer

Volume

Answer

Density

Answer

Viscosity

Answer

Pressure

Question 43

The equation of continuity for an incompressible fluid flowing through a pipe is expressed as:

Accepted Answer

ρ1A1v1 = ρ2A2v2

Answer

ρ1A1v1^2 = ρ2A2v2^2

Answer

ρ1A1v1/v2 = ρ2A2

Answer

ρ1v1 = ρ2v2

Question 44

In a Newtonian fluid, shear stress is:

Accepted Answer

Proportional to the rate of strain

Answer

Inversely proportional to the velocity gradient

Answer

Independent of fluid properties

Answer

A constant value

Question 45

Define the fundamental property of fluids known as density.

Accepted Answer

Mass per unit volume

Answer

Force per unit area

Answer

Resistance to flow

Answer

Specific heat capacity

Question 46

State the relationship between pressure and depth in a fluid.

Accepted Answer

Pressure is proportional to depth.

Answer

Pressure is independent of depth.

Answer

Pressure is inversely proportional to depth.

Answer

Pressure is zero at all depths.

Question 47

Which of the following equations represents the conservation of mass for an incompressible fluid?

Accepted Answer

ρ₁A₁v₁ = ρ₂A₂v₂

Answer

ρv = constant

Answer

ρ₁v₁^2 = ρ₂v₂^2

Answer

ρgh = constant

Question 48

Distinguish between laminar and turbulent flow regimes.

Accepted Answer

Laminar flow is characterized by smooth, orderly layers, while turbulent flow is chaotic and unpredictable.

Answer

Laminar flow occurs at high velocities, while turbulent flow occurs at low velocities.

Answer

Laminar flow is more efficient than turbulent flow.

Answer

Laminar flow is only possible in viscous fluids.

Question 49

Explain how fluid viscosity affects fluid flow.

Accepted Answer

Viscosity resists the relative motion of fluid layers.

Answer

Viscosity is constant for all fluids at a given temperature.

Answer

Viscosity decreases with increasing pressure.

Answer

Viscosity is negligible for gases.

Question 50

Describe the primary mechanism responsible for lift generation on an airfoil.

Accepted Answer

Pressure difference between the upper and lower surfaces

Answer

Viscosity of the air flowing over the airfoil

Answer

Inertia of the air deflected by the airfoil

Answer

Gravitational force acting on the airfoil

Question 51

Name the instrument commonly utilized to measure fluid pressure.

Accepted Answer

Manometer

Answer

Rotameter

Answer

Anemometer

Answer

Thermometer

Question 52

The Bernoulli equation is applicable to:

Accepted Answer

Steady flow, relating energy, pressure, and velocity

Answer

Unsteady flow, relating mass flow rate, pressure, and velocity

Answer

Viscous flow, relating energy, momentum, and pressure

Answer

Compressible flow, relating mass flow rate, momentum, and velocity

Question 53

In laminar flow, the velocity profile across a pipe is:

Accepted Answer

Parabolic

Answer

Triangular

Answer

Rectangular

Answer

Exponential

Question 54

The Reynolds number is a dimensionless parameter that indicates the:

Accepted Answer

Ratio of inertial forces to viscous forces

Answer

Ratio of pressure forces to viscous forces

Answer

Ratio of gravity forces to viscous forces

Answer

Ratio of surface tension forces to viscous forces

Question 55

Viscosity is a property of a fluid that describes its:

Accepted Answer

Resistance to deformation

Answer

Density

Answer

Compressibility

Answer

Surface tension

Question 56

In a centrifugal pump, fluid enters the impeller at its:

Accepted Answer

Eye

Answer

Outlet

Answer

Volute

Answer

Diffuser