Fluid Mechanics Learning Quizzes for Engineering Science

Question 1

Which of the following is NOT a defining characteristic of a fluid?

Accepted Answer

Is highly compressible

Answer

Assumes the shape of its container

Answer

Cannot withstand shear stress

Answer

Has a definite volume

Question 2

In the SI unit system, pressure is measured in:

Accepted Answer

Pascals (Pa)

Answer

Newtons (N)

Answer

Joules (J)

Answer

Bars (bar)

Question 3

Which type of flow regime is characterized by chaotic, irregular motion of fluid particles?

Accepted Answer

Turbulent flow

Answer

Laminar flow

Answer

Stokes flow

Answer

Couette flow

Question 4

The Bernoulli equation is primarily used to analyze:

Accepted Answer

Energy conversion in fluid flow

Answer

Fluid velocity

Answer

Fluid pressure

Answer

Fluid temperature

Question 5

A diffuser in a fluid system serves to:

Accepted Answer

Increase pressure by decreasing velocity

Answer

Decrease pressure by increasing velocity

Answer

Convert potential energy to kinetic energy

Answer

Change the direction of fluid flow

Question 6

The operation of a hydraulic pump is based on the principle of:

Accepted Answer

Pascal's law

Answer

Bernoulli's equation

Answer

Archimedes' principle

Answer

Newton's third law of motion

Question 7

Cavitation in fluid systems can lead to:

Accepted Answer

Equipment damage and reduced efficiency

Answer

Improved flow performance

Answer

Increased pressure

Answer

No impact on fluid flow

Question 8

Which device is NOT used for measuring fluid flow rate?

Accepted Answer

Anemometer

Answer

Venturi meter

Answer

Pitot tube

Answer

Ultrasonic flowmeter

Question 9

The primary function of a control valve in a fluid system is to:

Accepted Answer

Regulate fluid flow rate and pressure

Answer

Measure fluid temperature

Answer

Generate fluid energy

Answer

Prevent overpressure

Question 10

What is a boundary layer, and why is it important in fluid mechanics?

Accepted Answer

A thin layer of fluid near a surface where velocity is reduced due to friction.

Answer

A region of fluid flow unaffected by nearby surfaces.

Answer

An area where laminar flow dominates and viscosity is most important.

Question 11

Which factors primarily determine the magnitude of drag and lift forces acting on an object in a fluid? Provide real-world examples to illustrate your answer.

Accepted Answer

Shape, size, velocity, direction of motion relative to the fluid, fluid density, and viscosity

Answer

Shape and size only

Answer

Velocity and direction of motion relative to the fluid only

Answer

Fluid density and viscosity only

Question 12

Which property is NOT characteristic of a fluid?

Accepted Answer

Rigidity

Answer

Density

Answer

Viscosity

Answer

Temperature

Question 13

In the SI system, the dynamic viscosity of a fluid is measured in:

Accepted Answer

Pascal-seconds (Pa·s)

Answer

Newton-seconds (N·s)

Answer

Pascals (Pa)

Answer

Newtons (N)

Question 14

Which flow regime is characterized by smooth, orderly layers of fluid?

Accepted Answer

Laminar flow

Answer

Turbulent flow

Answer

Compressible flow

Answer

Incompressible flow

Question 15

In a fluid, how does pressure vary with depth?

Accepted Answer

Pressure increases linearly with depth

Answer

Pressure increases quadratically with depth

Answer

Pressure decreases linearly with depth

Answer

Pressure remains constant with depth

Question 16

What is the primary function of the Bernoulli equation?

Accepted Answer

Relating pressure, velocity, and height in a fluid

Answer

Calculating forces exerted by fluids on surfaces

Answer

Determining fluid flow rates

Answer

Evaluating the efficiency of fluid machines

Question 17

Which of these is NOT considered a fluid machine?

Accepted Answer

Heat exchanger

Answer

Pump

Answer

Turbine

Answer

Compressor

Question 18

In fluid flow systems, the principle of mass conservation implies that:

Accepted Answer

Mass flow rate remains constant throughout the system

Answer

Mass can neither be created nor destroyed

Answer

Mass density remains constant throughout the system

Answer

Velocity is inversely proportional to mass flow rate

Question 19

Which of the following is NOT a fundamental property of fluids?

Accepted Answer

Volume

Answer

Density

Answer

Viscosity

Answer

Pressure

Question 20

Which type of fluid exhibits a constant shear stress for a given shear rate?

Accepted Answer

Newtonian fluid

Answer

Non-Newtonian fluid

Answer

Ideal fluid

Answer

Viscous fluid

Question 21

Which of the following devices is used to control the flow rate of a fluid?

Accepted Answer

Valve

Answer

Pump

Answer

Turbine

Answer

Heat exchanger

Question 22

The boundary layer in a fluid flow is the region where:

Accepted Answer

Fluid viscosity dominates

Answer

Fluid velocity is zero

Answer

Fluid velocity is maximum

Answer

Fluid pressure is highest

Question 23

Laminar flow is characterized by:

Accepted Answer

Smooth, orderly fluid motion

Answer

Turbulent, chaotic fluid motion

Answer

High fluid velocity

Answer

Low fluid viscosity

Question 24

The SI unit of dynamic viscosity is:

Accepted Answer

Newton-second per square meter

Answer

Pascal

Answer

Kilogram per cubic meter

Answer

Pascal-second

Question 25

Which type of fluid flow is characterized by the presence of turbulence?

Accepted Answer

Turbulent flow

Answer

Laminar flow

Answer

Poiseuille flow

Answer

Couette flow

Question 26

A centrifugal pump is a type of fluid machine that converts:

Accepted Answer

Mechanical energy to fluid energy

Answer

Fluid energy to mechanical energy

Answer

Pressure energy to potential energy

Answer

Potential energy to pressure energy

Question 27

Which of the following is NOT a factor that affects the efficiency of a fluid machine?

Accepted Answer

Specific Gravity

Answer

Flow rate

Answer

Head

Answer

Power

Question 28

The Bernoulli equation is applicable to incompressible and inviscid fluids.

Accepted Answer

True

Answer

False

Question 29

Fluid mechanics is NOT essential in the design and operation of:

Accepted Answer

Hospitals

Answer

Aircraft

Answer

Automobiles

Answer

Power plants

Question 30

Which property of a fluid directly influences its resistance to flow?

Accepted Answer

Viscosity

Answer

Density

Answer

Surface tension

Answer

Pressure

Question 31

The equation that relates pressure, velocity, and elevation in a fluid at rest is known as:

Accepted Answer

Hydrostatic pressure equation

Answer

Bernoulli's equation

Answer

Navier-Stokes equations

Answer

Hagen-Poiseuille equation

Question 32

Which type of pump is most appropriate for applications involving high-pressure fluids?

Accepted Answer

Positive displacement pump

Answer

Centrifugal pump

Answer

Axial-flow pump

Answer

Jet pump

Question 33

Which factor does NOT influence the calculation of the Reynolds number?

Accepted Answer

Ambient temperature

Answer

Fluid density

Answer

Pipe diameter

Answer

Fluid viscosity

Question 34

What is the primary factor that causes turbulence in a fluid flow?

Accepted Answer

High velocity and/or low viscosity

Answer

Low velocity and/or high viscosity

Answer

High pressure and/or low temperature

Answer

Low pressure and/or high temperature

Question 35

In the SI system, the unit of viscosity is:

Accepted Answer

Pascal-second (Pa·s)

Answer

Newton-second (N·s)

Answer

Kilogram per meter-second (kg/m·s)

Answer

Poise (P)

Question 36

Which equation represents the relationship between pressure and elevation in a fluid at rest?

Accepted Answer

p = ρgh

Answer

p = Q/A

Answer

h = Q/A

Answer

p = Qv

Question 37

What is the main purpose of a diffuser in a fluid system?

Accepted Answer

To decrease fluid velocity

Answer

To increase fluid velocity

Answer

To increase fluid pressure

Answer

To decrease fluid pressure

Question 38

Which of the following is NOT a unit of pressure?

Accepted Answer

kg/m

Answer

bar

Answer

atm

Answer

N/m^2

Question 39

The Bernoulli equation relates which three quantities?

Accepted Answer

Pressure, velocity, and height

Answer

Density, viscosity, and temperature

Answer

Force, mass, and acceleration

Question 40

Which factor primarily influences the viscosity of a fluid?

Accepted Answer

Temperature

Answer

Density

Answer

Pressure

Answer

Volume

Question 41

The Reynolds number characterizes which fluid flow property?

Accepted Answer

Turbulence

Answer

Density

Answer

Velocity

Answer

Viscosity

Question 42

Which device converts fluid energy into mechanical energy?

Accepted Answer

Turbine

Answer

Pump

Answer

Valve

Answer

Pipe

Question 43

The discharge coefficient of a nozzle indicates its:

Accepted Answer

Efficiency

Answer

Pressure drop

Answer

Power

Answer

Capacity

Question 44

Which flow type involves smooth, parallel streamlines?

Accepted Answer

Laminar flow

Answer

Compressible flow

Answer

Transitional flow

Answer

Turbulent flow

Question 45

Pressure loss in a pipe is proportional to:

Accepted Answer

Pipe length and the square of flow velocity

Answer

Pipe length and flow velocity

Answer

Pipe diameter and flow velocity

Question 46

The buoyant force on a submerged object is equivalent to:

Accepted Answer

The weight of the fluid displaced

Answer

The weight of the object

Answer

The density of the fluid times the object's volume

Answer

The pressure difference between the object's top and bottom