Fluid Mechanics Basics: Master the Fundamentals of Fluid Behavior

Question 1

Which fluid property measures how much a fluid resists changing shape when force is applied?

Accepted Answer

Viscosity

Answer

Density

Answer

Pressure

Answer

Specific gravity

Question 2

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

Accepted Answer

Hardness

Answer

Density

Answer

Viscosity

Answer

Pressure

Question 3

The SI unit of pressure is:

Accepted Answer

Pascal (Pa)

Answer

Newton (N)

Answer

Kilogram (kg)

Answer

Meter (m)

Question 4

Which type of fluid exhibits zero shear stress at any rate of shear?

Accepted Answer

Ideal fluid

Answer

Newtonian fluid

Answer

Non-Newtonian fluid

Answer

Viscous fluid

Question 5

The pressure at a depth 'h' in a static fluid is given by:

Accepted Answer

ρgh

Answer

h/ρg

Answer

g/ρh

Answer

ρh/g

Question 6

The continuity equation in fluid mechanics expresses the principle of:

Accepted Answer

Mass conservation

Answer

Momentum conservation

Answer

Energy conservation

Answer

Angular momentum conservation

Question 7

Which type of flow is characterized by smooth, laminar layers of fluid?

Accepted Answer

Laminar flow

Answer

Turbulent flow

Answer

Poiseuille flow

Answer

Couette flow

Question 8

The Reynolds number is a dimensionless parameter used to determine the:

Accepted Answer

Likelihood of laminar or turbulent flow

Answer

Magnitude of the pressure drop in a pipe

Answer

Viscosity of a fluid

Answer

Density of a fluid

Question 9

Which of the following devices is used to measure fluid velocity?

Accepted Answer

Pitot tube

Answer

Thermometer

Answer

Manometer

Answer

Barometer

Question 10

Pascal's law states that pressure applied to a fluid at rest is transmitted equally in all directions throughout the fluid. True or False?

Accepted Answer

True

Answer

False

Question 11

Which of the following is NOT a type of fluid flow?

Accepted Answer

Ideal flow

Answer

Laminar flow

Answer

Turbulent flow

Answer

Viscous flow

Question 12

The Bernoulli equation relates:

Accepted Answer

Pressure, velocity, and elevation

Answer

Force, mass, and acceleration

Answer

Torque, power, and speed

Answer

Energy, momentum, and heat

Question 13

The viscosity of a fluid is a measure of its:

Accepted Answer

Resistance to flow

Answer

Ability to store energy

Answer

Density

Answer

Thermal conductivity

Question 14

Which of the following factors does NOT affect the pressure gradient in a fluid?

Accepted Answer

Pipe material

Answer

Fluid density

Answer

Fluid velocity

Answer

Pipe diameter

Question 15

Cavitation occurs when:

Accepted Answer

Vapor bubbles form in a fluid due to a decrease in pressure

Answer

Fluid pressure increases

Answer

Fluid temperature decreases

Answer

Fluid density changes

Question 16

Which of the following is NOT a fluid property?

Accepted Answer

Boiling point

Answer

Density

Answer

Viscosity

Answer

Pressure

Question 17

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

Accepted Answer

Buoyancy

Answer

Gravity

Answer

Drag

Answer

Friction

Question 18

The equation of hydrostatic pressure is:

Accepted Answer

P = ρgh

Answer

P = V/A

Answer

P = F/A

Answer

P = Δt/Δh

Question 19

The Reynolds number is used to determine the:

Accepted Answer

Fluid flow regime

Answer

Fluid viscosity

Answer

Pipe diameter

Answer

Pressure drop

Question 20

Which of the following units measures fluid viscosity?

Accepted Answer

Pascal-second (Pa·s)

Answer

Newton-meter (N·m)

Answer

Kilogram per cubic meter (kg/m³)

Answer

Meter per second (m/s)

Question 21

The Bernoulli equation relates:

Accepted Answer

Pressure, velocity, and elevation

Answer

Flow rate, pressure, and temperature

Answer

Viscosity, density, and surface tension

Answer

Energy, momentum, and mass

Question 22

The Navier-Stokes equations describe:

Accepted Answer

Fluid flow in a viscous fluid

Answer

Fluid flow in an inviscid fluid

Answer

Fluid flow in a non-Newtonian fluid

Answer

Fluid flow in a compressible fluid

Question 23

Which of the following is NOT a property of fluids?

Accepted Answer

Hardness

Answer

Density

Answer

Viscosity

Answer

Compressibility

Question 24

The pressure at a point in a fluid is:

Accepted Answer

Equal to the weight of the fluid above the point

Answer

Independent of the depth of the point

Answer

Proportional to the distance from the surface

Answer

Zero at the surface

Question 25

The force exerted by a fluid on a submerged surface is known as:

Accepted Answer

Buoyancy

Answer

Drag

Answer

Thrust

Answer

Lift

Question 26

The center of pressure of a submerged surface is:

Accepted Answer

The point at which the resultant force acts

Answer

Always located at the centroid of the surface

Answer

Independent of the depth of the surface

Answer

The point at which the pressure is maximum

Question 27

The equation for hydrostatic pressure is:

Accepted Answer

P = ρgh

Answer

P = Vg

Answer

P = ρv

Answer

P = F/A

Question 28

The Reynolds number is a dimensionless number used to characterize:

Accepted Answer

Fluid flow regimes

Answer

Fluid density

Answer

Fluid viscosity

Answer

Fluid pressure

Question 29

The governing equations for fluid flow are:

Accepted Answer

Conservation of mass, momentum, and energy

Answer

Conservation of momentum and energy

Answer

Conservation of mass and momentum

Answer

Conservation of energy only

Question 30

Which SI unit is used to quantify pressure?

Accepted Answer

Pascal

Answer

Newton

Answer

Bar

Answer

Kilojoule

Question 31

A fluid is in hydrostatic equilibrium when:

Accepted Answer

The net force acting on any fluid parcel is zero

Answer

The pressure is constant throughout the fluid

Answer

The velocity is zero everywhere in the fluid

Answer

The fluid is incompressible

Question 32

The pressure at a point within a fluid is:

Accepted Answer

A combination of all the above

Answer

Equal to the weight of the fluid above the point

Answer

Independent of the shape of the container

Answer

Proportional to the depth of the point below the surface

Question 33

The force exerted by a fluid on a submerged object is known as:

Accepted Answer

Buoyant force

Answer

Drag force

Answer

Lift force

Answer

Pressure force

Question 34

Archimedes' principle states that the buoyant force on a submerged object is:

Accepted Answer

Equal to the weight of the fluid displaced by the object

Answer

Equal to the weight of the object in air

Answer

Equal to the weight of the object in water

Answer

Equal to the density of the fluid multiplied by the volume of the object

Question 35

Which of the following equations describes mass conservation in fluid flow?

Accepted Answer

Continuity equation

Answer

Navier-Stokes equations

Answer

Bernoulli equation

Answer

Euler equations

Question 36

Pressure exerted by a fluid at a given point is defined as:

Accepted Answer

Force per unit area perpendicular to the surface

Answer

Force per unit volume

Answer

Force per unit length

Answer

Force per unit time

Question 37

The equation of continuity expresses the conservation of:

Accepted Answer

Mass

Answer

Volume

Answer

Momentum

Answer

Energy

Question 38

The pressure at the bottom of a cylindrical tank filled with water depends on:

Accepted Answer

Tank's height

Answer

Tank's diameter

Answer

Tank's surface area

Answer

Tank's volume

Question 39

The Bernoulli equation is applicable to:

Accepted Answer

Incompressible, inviscid, steady flow

Answer

Compressible, viscous, unsteady flow

Answer

Incompressible, viscous, unsteady flow

Answer

Compressible, inviscid, steady flow

Question 40

Which of the following forces does NOT act on a submerged object?

Accepted Answer

Friction force

Answer

Buoyant force

Answer

Gravitational force

Answer

Viscous force

Question 41

In a horizontal pipe, how does fluid velocity change as the pressure gradient increases?

Accepted Answer

Fluid velocity increases proportionally.

Answer

Fluid velocity decreases proportionally.

Answer

Fluid velocity remains constant.

Answer

Fluid velocity decreases proportionally to the square of the pressure gradient.

Question 42

Which of the following is a fundamental property of fluids?

Accepted Answer

Mass

Answer

Shape

Answer

Volume

Answer

Color

Question 43

According to Pascal's Law, when pressure is applied to a confined fluid, it is transmitted:

Accepted Answer

Undiminished to every point in the fluid

Answer

Faster in the center of the fluid

Answer

Only to the bottom of the container

Answer

Only to the surface of the fluid

Question 44

Which of the following is an inherent characteristic of fluids?

Accepted Answer

Density

Answer

Fixed volume

Answer

Specific color

Answer

Definite shape

Question 45

Fluid statics is the study of:

Accepted Answer

Fluids at rest

Answer

Flow patterns in fluids

Answer

Thermodynamic properties of fluids

Answer

Fluids in motion

Question 46

The International System of Units (SI) unit of pressure is the:

Accepted Answer

Pascal (Pa)

Answer

Joule (J)

Answer

Newton (N)

Answer

Atmosphere (atm)

Question 47

The hydrostatic paradox states that the pressure at a given depth in a fluid:

Accepted Answer

Is independent of the shape and volume of the containing vessel

Answer

Is directly proportional to the volume of the containing vessel

Question 48

Which of the following forces is NOT exerted on a submerged object?

Accepted Answer

Friction

Answer

Gravity

Answer

Drag

Answer

Buoyancy

Question 49

The principle of buoyancy states that an object submerged in a fluid experiences an upward force:

Accepted Answer

Equal to the weight of the displaced fluid

Answer

Equal to the weight of the submerged object

Question 50

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

Accepted Answer

Laminar

Answer

Turbulent

Answer

Compressible

Answer

Incompressible

Question 51

The fundamental difference between a fluid and a solid is that:

Accepted Answer

A fluid cannot withstand shear stress, while a solid can

Answer

A fluid has a definite shape, while a solid does not

Answer

A fluid has a fixed volume, while a solid does not

Question 52

An example of a practical application of fluid mechanics is:

Accepted Answer

Designing the wings of an airplane

Answer

Erecting a skyscraper

Answer

Baking a cake

Answer

Weaving cloth