Master Fluid Mechanics Fundamentals: Interactive Learning Quizzes

Question 1

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

Accepted Answer

Conductivity

Answer

Density

Answer

Viscosity

Answer

Surface tension

Question 2

Which of the following is NOT a property of a fluid that describes its physical characteristics?

Accepted Answer

Velocity

Answer

Density

Answer

Viscosity

Answer

Surface tension

Question 3

According to Bernoulli's principle, how do pressure and velocity relate along a streamline?

Accepted Answer

Pressure decreases as velocity increases.

Answer

Pressure increases as velocity increases.

Answer

Pressure remains constant regardless of velocity.

Answer

Velocity remains constant regardless of pressure.

Question 4

In a stationary fluid, which factor does NOT influence the overall pressure force acting on an immersed object?

Accepted Answer

Fluid velocity

Answer

Fluid density

Answer

Depth of submergence

Answer

Surface area of the immersed object

Question 5

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

Accepted Answer

Volume

Answer

Density

Answer

Viscosity

Answer

Surface tension

Question 6

In fluid mechanics, dynamic viscosity measures the:

Accepted Answer

Resistance to flow

Answer

Mass per unit volume

Answer

Change in volume under pressure

Answer

Cohesive forces at an interface

Question 7

Which property is not a characteristic of a fluid?

Accepted Answer

Elasticity

Answer

Density

Answer

Viscosity

Answer

Surface tension

Question 8

Which of the following is **not** a fundamental fluid property in introductory fluid mechanics?

Accepted Answer

Electrical conductivity

Answer

Density

Answer

Viscosity

Answer

Surface tension

Question 9

In a Venturi meter, the cross-sectional area at point 1 (A1) is related to the cross-sectional area at point 2 (A2). Which of the following relationships is correct?

Accepted Answer

A1 is greater than A2

Answer

A1 is equal to A2

Answer

A1 divided by A2 is equal to 2

Answer

A1 squared is equal to A2 squared

Question 10

Which fluid flow regime is characterized by fluid particles moving in straight, parallel paths?

Accepted Answer

Laminar

Answer

Turbulent

Answer

Boundary layer

Question 11

Which of the following characterizes the boundary layer in fluid flow?

Accepted Answer

Dominant viscous forces

Answer

Constant velocity

Answer

Constant pressure

Answer

Straight-line fluid particle motion

Question 12

Which principle is the Venturi meter, a device used to measure fluid flow rate, based on?

Accepted Answer

Conservation of energy (Bernoulli's principle)

Answer

Conservation of mass

Answer

Conservation of momentum

Answer

Conservation of angular momentum

Question 13

Bernoulli's equation states that the total mechanical energy of an incompressible fluid remains constant along a streamline. Which of the following does NOT contribute to this total mechanical energy?

Accepted Answer

Internal energy

Answer

Kinetic energy

Answer

Potential energy due to height

Question 14

What is fluid density and why is it important in fluid mechanics?

Accepted Answer

Fluid density is the mass of a fluid per unit volume.

Answer

Fluid density is the force acting on a fluid per unit area.

Answer

Fluid density is the velocity of a fluid.

Answer

Fluid density is the viscosity of a fluid.

Question 15

Which boundary layer type is the thinnest?

Accepted Answer

Laminar boundary layer

Answer

Transitional boundary layer

Answer

Turbulent boundary layer

Question 16

Which characteristic is NOT associated with laminar flow?

Accepted Answer

High Reynolds number

Answer

Smooth, non-crossing streamlines

Answer

Straight-line particle paths

Answer

No velocity fluctuations

Question 17

How does surface tension relate to the molecular structure of a fluid?

Accepted Answer

Surface tension is directly proportional to the strength of the cohesive forces between fluid molecules.

Answer

Surface tension is inversely proportional to the fluid's density.

Answer

Surface tension is unaffected by temperature.

Answer

Surface tension is a measure of the fluid's resistance to flow.

Question 18

In fluid mechanics, which equation expresses the relationship between pressure, velocity, and elevation within a flowing fluid?

Accepted Answer

Bernoulli's Equation

Answer

Pascal's Law

Answer

Buoyancy

Answer

Continuity Equation

Question 19

In fluid mechanics, which of the following is NOT a fundamental property of fluids?

Accepted Answer

Solubility

Answer

Density

Answer

Viscosity

Question 20

In fluid mechanics, what is a boundary layer?

Accepted Answer

A thin layer of fluid near a solid surface where viscous effects are significant, causing a velocity gradient

Answer

A region of high pressure within a flowing fluid

Answer

A layer of fluid with a uniform velocity throughout its thickness

Answer

A region where turbulence is dominant

Question 21

Explain the importance of dimensional analysis in fluid mechanics, and provide a specific example of how it is used.

Accepted Answer

Dimensional analysis ensures the consistency of units in fluid mechanics equations, leading to meaningful and physically valid results.

Accepted Answer

Dimensional analysis can be used to verify the validity of fluid mechanics equations.

Answer

Dimensional analysis is only applicable to situations involving multiple fluids.

Answer

Dimensional analysis is not essential for fluid mechanics problems involving only incompressible fluids.

Question 22

Which factors are critical for the formation and maintenance of boundary layers in fluid flow?

Accepted Answer

Fluid velocity, fluid viscosity, and surface roughness

Answer

Fluid density, fluid pressure, and surface temperature

Answer

Fluid compressibility, fluid elasticity, and surface curvature

Answer

Fluid conductivity, fluid permittivity, and surface charge

Question 23

Define the Reynolds number and explain its role in determining the flow regime (laminar, turbulent, or transitional) in fluid flow.

Accepted Answer

The Reynolds number is a dimensionless quantity that compares inertial forces to viscous forces, determining the flow regime.

Answer

The Reynolds number measures fluid density and viscosity, used to calculate pressure drop in pipes.

Answer

The Reynolds number is a constant for a given fluid, unaffected by flow conditions.

Answer

The Reynolds number applies only to laminar flow and cannot predict turbulent flow.

Question 24

What is the velocity gradient of a flow field?

Accepted Answer

The rate of change of velocity with respect to distance

Answer

The rate of change of velocity with respect to time

Answer

The rate of change of pressure with respect to time

Answer

The rate of change of pressure with respect to distance

Question 25

Which conservation law states that mass cannot be created or destroyed?

Accepted Answer

Law of Conservation of Mass

Answer

Law of Conservation of Energy

Answer

Law of Conservation of Momentum

Answer

Law of Conservation of Angular Momentum

Question 26

What is the dynamic viscosity of a fluid?

Accepted Answer

The resistance to flow due to internal friction

Answer

The resistance to flow due to external forces

Answer

The force required to move the fluid

Answer

The pressure difference required to move the fluid

Question 27

What is the boundary layer?

Accepted Answer

The region of fluid near a solid surface where the velocity is zero

Answer

The region of fluid near a solid surface where the velocity is maximum

Answer

The region of fluid near a solid surface where the pressure is zero

Answer

The region of fluid near a solid surface where the pressure is maximum

Question 28

Incompressible flow is characterized by:

Accepted Answer

Constant density throughout the flow

Answer

Low flow velocities

Answer

Negligible pressure gradient

Answer

High Reynolds numbers

Question 29

The Reynolds number represents:

Accepted Answer

The ratio of inertial forces to viscous forces

Answer

The ratio of pressure forces to inertial forces

Answer

The ratio of viscous forces to surface tension forces

Answer

The ratio of gravity forces to surface tension forces

Question 30

The boundary layer is defined as the region where:

Accepted Answer

Viscous effects are significant

Answer

Pressure forces dominate

Answer

Inertial effects are negligible

Answer

Flow is fully developed

Question 31

The Navier-Stokes equations govern:

Accepted Answer

Incompressible, viscous flow

Answer

Compressible, inviscid flow

Answer

Potential flow

Answer

Laminar flow

Question 32

According to the Buckingham Pi theorem, the number of dimensionless groups is equal to:

Accepted Answer

The number of variables minus the number of fundamental dimensions

Answer

The number of variables plus the number of fundamental dimensions

Answer

The number of variables multiplied by the number of fundamental dimensions

Answer

The number of fundamental dimensions squared

Question 33

In a fluid system, pressure at a point is a:

Accepted Answer

Scalar quantity

Answer

Vector quantity

Answer

Tensor quantity

Answer

Complex quantity

Question 34

Which process involves removing suspended particles from a fluid by passing it through a filter?

Accepted Answer

Filtration

Answer

Fluidization

Answer

Agglomeration

Question 35

In fluid mechanics, which force acts against the motion of an object through a fluid?

Accepted Answer

Drag

Answer

Gravity

Answer

Pressure

Answer

Centrifugal

Question 36

What is the International System of Units (SI) unit of kinematic viscosity?

Accepted Answer

m²/s

Answer

Pa s

Answer

N s/m²

Answer

kg/m³

Question 37

Which of the following is NOT a fundamental dimension of velocity?

Accepted Answer

Acceleration

Answer

Time

Answer

Length

Answer

Displacement

Question 38

Which type of flow is characterised by smooth, laminar layers?

Accepted Answer

Viscous

Answer

Turbulent

Answer

Compressible

Answer

Incompressible

Question 39

Explain the difference between gauge pressure and absolute pressure.

Accepted Answer

Absolute pressure includes atmospheric pressure, while gauge pressure does not

Answer

Gauge pressure includes atmospheric pressure, while absolute pressure does not

Answer

They are the same thing

Answer

Gauge pressure is for liquids, while absolute pressure is for gases

Question 40

Which principle states that the volume flow rate through a pipe is proportional to the square root of the pressure difference across the pipe?

Accepted Answer

Poiseuille's law

Answer

Bernoulli's principle

Answer

Archimedes' principle

Answer

Pascal's law

Question 41

Define the term used to describe the behaviour of a fluid that resists shear stress.

Accepted Answer

Viscosity

Answer

Compressibility

Answer

Surface tension

Answer

Capillarity

Question 42

Which fundamental property distinguishes a fluid from a solid?

Accepted Answer

Ability to flow and conform to the shape of its container

Answer

Fixed shape and volume

Answer

Constant density

Answer

Low viscosity

Question 43

What equation describes the velocity field of an incompressible, inviscid fluid?

Accepted Answer

Euler equation

Answer

Bernoulli's equation

Answer

Continuity equation

Answer

Navier-Stokes equations

Question 44

Which conservation law is NOT applicable to fluid mechanics?

Accepted Answer

Conservation of entropy

Answer

Conservation of mass

Answer

Conservation of energy

Answer

Conservation of momentum

Question 45

Which device is commonly used to measure fluid velocity in a pipe?

Accepted Answer

Pitot tube

Answer

Anemometer

Answer

Manometer

Answer

Thermometer

Question 46

What is the relationship between pressure and elevation in a fluid at rest?

Accepted Answer

Pressure is directly proportional to elevation.

Answer

Pressure is inversely proportional to elevation.

Answer

Pressure is constant throughout the fluid.

Answer

Pressure is independent of elevation.

Question 47

What is the key difference between a Newtonian and a non-Newtonian fluid?

Accepted Answer

Newtonian fluids have constant viscosity, while non-Newtonian fluids have a viscosity that varies depending on factors like shear rate.

Answer

Non-Newtonian fluids have constant viscosity, while Newtonian fluids have a viscosity that varies depending on temperature or pressure.

Answer

Newtonian fluids are more viscous than non-Newtonian fluids.

Answer

Non-Newtonian fluids are less viscous than Newtonian fluids.

Question 48

Which property is not essential in characterizing fluids?

Accepted Answer

Hardness

Answer

Density

Answer

Viscosity

Answer

Compressibility

Question 49

Fluid velocity at a specific point in a flow field is a:

Accepted Answer

Vector quantity

Answer

Scalar quantity

Answer

Tensor quantity

Question 50

Describe the key difference between laminar and turbulent flow:

Accepted Answer

Laminar flow exhibits organized fluid motion, while turbulent flow is characterized by random and chaotic fluid motion.

Answer

Laminar flow has higher shear stress than turbulent flow.

Answer

Turbulent flow has higher shear stress than laminar flow.

Answer

Laminar flow is exclusive to pipes, while turbulent flow is exclusive to open channels.

Question 51

Which dimensionless number quantifies the relative significance of viscous forces to inertial forces in fluid flow?

Accepted Answer

Reynolds number

Answer

Froude number

Answer

Mach number

Question 52

Express the Bernoulli equation:

Accepted Answer

An equation relating pressure, velocity, and elevation in fluid flow

Answer

An equation relating mass flow rate, pressure, and velocity in fluid flow

Answer

An equation relating shear stress, velocity, and viscosity in fluid flow

Question 53

What is the primary purpose of the continuity equation in fluid mechanics?

Accepted Answer

To express the conservation of mass in a fluid flow

Answer

To express the conservation of momentum in a fluid flow

Answer

To express the conservation of energy in a fluid flow

Answer

To relate velocity and pressure in a fluid flow

Question 54

Describe the difference between Newtonian and non-Newtonian fluids:

Accepted Answer

Newtonian fluids exhibit a linear relationship between shear stress and shear rate, while non-Newtonian fluids do not.

Answer

Non-Newtonian fluids exhibit a linear relationship between shear stress and shear rate, while Newtonian fluids do not.

Answer

Newtonian fluids are exclusively laminar, while non-Newtonian fluids can be either laminar or turbulent.

Answer

Non-Newtonian fluids are exclusively turbulent, while Newtonian fluids can be either laminar or turbulent.

Question 55

In offshore engineering, what is a key advantage of employing fluid-structure interaction (FSI) modeling?

Accepted Answer

It can be utilized to improve predictions of fatigue life for offshore structures.

Answer

It can only be used to evaluate the behavior of stationary offshore structures.

Answer

Wave-structure interactions always enhance the structural integrity of offshore platforms.

Answer

FSI modeling is computationally efficient and can be easily performed on standard personal computers.

Question 56

Fluid-structure interaction (FSI) is crucial in aircraft design and analysis. Explain how FSI impacts these processes.

Accepted Answer

It can induce flutter, compromising the aircraft's stability and control.

Accepted Answer

It can modify the aircraft's maneuverability characteristics.

Accepted Answer

It can increase the aircraft's drag due to fluid-structure interaction.

Answer

FSI has no significant impact on aircraft design and analysis.

Question 57

How does computational fluid dynamics (CFD) contribute to enhancing the design and efficiency of fluid machinery?

Accepted Answer

CFD is crucial for optimizing fluid machinery designs and boosting their efficiency.

Answer

CFD has a limited impact on fluid machinery design and efficiency.

Answer

CFD is not applicable to the design of fluid machinery.

Answer

CFD can negatively impact fluid machinery design and efficiency.

Question 58

Describe the principles of fluid machinery, including pumps, turbines, and compressors. Discuss their working principles, performance characteristics, and applications across different industries.

Accepted Answer

Comprehensive and Accurate

Answer

Partially Correct

Answer

Inaccurate

Question 59

Which flow regime is NOT a type of boundary layer?

Accepted Answer

Separated

Answer

Laminar

Answer

Turbulent

Answer

Transitional

Question 60

In fluid mechanics, explain the importance of dimensional analysis. Describe the steps involved in using the Buckingham Pi theorem.

Accepted Answer

The Buckingham Pi theorem helps derive dimensionless numbers from a set of variables.

Answer

Dimensional analysis is not necessary for solving fluid mechanics problems.

Answer

Dimensional analysis is only applicable to incompressible fluids.

Question 61

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

Accepted Answer

Wettability

Answer

Density

Answer

Compressibility

Answer

Viscosity

Question 62

An incompressible fluid flow implies that:

Accepted Answer

Its density does not vary with pressure changes.

Answer

Its temperature remains constant.

Answer

Its velocity is uniform.

Question 63

Which physical quantity is conserved by the continuity equation?

Accepted Answer

Mass

Answer

Momentum

Answer

Angular momentum

Answer

Energy

Question 64

The Bernoulli equation is valid for flows that are:

Accepted Answer

Inviscid, incompressible, and along a streamline.

Answer

Turbulent, incompressible, and in open channels.

Answer

Laminar, compressible, and with heat transfer.

Answer

Viscous, compressible, and in pipes.