Fluid Mechanics Basics: Dive into the Fundamentals of Fluid Behavior

Question 1

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

Accepted Answer

Volume

Answer

Density

Answer

Viscosity

Answer

Pressure

Question 2

Which of the following is the SI unit of kinematic viscosity?

Accepted Answer

m²/s

Answer

N·s/m²

Answer

Pa

Answer

kg/m³

Question 3

Which type of fluid does not exhibit a linear relationship between shear stress and shear rate?

Accepted Answer

Non-Newtonian fluid

Answer

Newtonian fluid

Answer

Ideal fluid

Answer

Viscous fluid

Question 4

Which of the following is the continuity equation?

Accepted Answer

ρ₁V₁A₁ = ρ₂V₂A₂

Answer

F = ma

Answer

E = mc²

Answer

P = IV

Question 5

Which property is NOT a defining characteristic of fluids?

Accepted Answer

Definitive shape

Answer

Fluidity

Answer

Viscosity

Answer

Density

Question 6

The SI unit for dynamic viscosity is:

Accepted Answer

Pascal-second (Pa·s)

Answer

Pascal (Pa)

Answer

Newton per square meter (N/m²)

Answer

Kilogram per meter-second (kg/(m·s))

Question 7

Which type of fluid exhibits a proportional relationship between shear stress and shear rate?

Accepted Answer

Newtonian

Answer

Non-Newtonian

Answer

Ideal

Answer

Viscous

Question 8

Given water, oil, and honey, which fluid has the highest viscosity?

Accepted Answer

Honey

Answer

Water

Answer

Oil

Answer

All have the same viscosity

Question 9

Which of the following dimensionless numbers is used to describe the ratio of inertial forces to viscous forces in fluid flow?

Accepted Answer

Reynolds number

Answer

Prandtl number

Answer

Mach number

Answer

Froude number

Question 10

The governing equations for incompressible fluid flow in laminar conditions are known as:

Accepted Answer

Navier-Stokes equations

Answer

Euler equations

Answer

Bernoulli equation

Answer

Darcy-Weisbach equation

Question 11

What is the primary purpose of a pitot tube?

Accepted Answer

Measuring fluid velocity

Answer

Measuring fluid pressure

Answer

Measuring fluid density

Answer

Measuring fluid temperature

Question 12

In the International System of Units (SI), the primary unit of pressure is the:

Accepted Answer

Pascal (Pa)

Answer

Bar

Answer

Atmosphere (atm)

Answer

Pound per square inch (psi)

Question 13

Fluids that exhibit a constant viscosity, regardless of the shear rate, are classified as:

Accepted Answer

Newtonian fluids

Answer

Non-Newtonian fluids

Answer

Ideal fluids

Answer

Viscous fluids

Question 14

Which of the following factors does not influence the density of a fluid?

Accepted Answer

Viscosity

Answer

Temperature

Answer

Pressure

Answer

Composition

Question 15

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

Accepted Answer

Buoyancy

Answer

Drag

Answer

Lift

Answer

Pressure

Question 16

The dimensionless number used to characterize the flow patterns of fluids is the:

Accepted Answer

Reynolds number

Answer

Mach number

Answer

Froude number

Answer

Weber number

Question 17

Which of the following instruments is primarily used to measure the pressure of fluids?

Accepted Answer

Manometer

Answer

Pitot tube

Answer

Venturi meter

Answer

Flowmeter

Question 18

The continuity equation is a mathematical expression that represents the conservation of:

Accepted Answer

Mass

Answer

Momentum

Answer

Energy

Answer

Entropy

Question 19

In laminar flow, an essential assumption is the:

Accepted Answer

Absence of velocity gradients

Answer

Presence of high Reynolds numbers

Answer

Incompressibility of the fluid

Answer

Newtonian behavior of the fluid

Question 20

Which of the following is NOT a fundamental fluid property?

Accepted Answer

Young's modulus

Answer

Density

Answer

Viscosity

Answer

Pressure

Question 21

Incompressible fluids exhibit:

Accepted Answer

Constant density regardless of pressure

Answer

Constant viscosity regardless of pressure

Answer

Constant velocity regardless of pressure

Answer

Constant temperature regardless of pressure

Question 22

Which equation represents the continuity equation in fluid mechanics?

Accepted Answer

ρAv = constant

Answer

F = ma

Answer

P = ρgh

Answer

Q = Av

Question 23

In laminar flow, the velocity profile is:

Accepted Answer

Parabolic

Answer

Linear

Answer

Constant

Answer

Exponential

Question 24

Bernoulli's equation applies to:

Accepted Answer

Incompressible, inviscid, steady flows

Answer

Compressible, viscous, unsteady flows

Answer

All flows regardless of their properties

Answer

Flows with negligible gravitational effects

Question 25

Which of the following is a characteristic that distinguishes fluids from solids?

Accepted Answer

Ability to flow

Answer

Definite shape and volume

Answer

High compressibility

Answer

Low density

Question 26

Classify the following fluid as Newtonian or non-Newtonian: honey

Accepted Answer

Non-Newtonian

Answer

Newtonian

Question 27

What type of flow regime is characterized by smooth, layered fluid motion?

Accepted Answer

Laminar

Answer

Turbulent

Answer

Transitional

Answer

Viscous

Question 28

What is the unit of dynamic viscosity in the SI system?

Accepted Answer

Pascal-second (Pa·s)

Answer

Centipoise (cP)

Answer

Poise (P)

Answer

Stokes (St)

Question 29

What is the mathematical relationship between shear stress and shear rate for a Newtonian fluid?

Accepted Answer

Linear

Answer

Exponential

Answer

Logarithmic

Answer

Parabolic

Question 30

Which of the following equations is fundamental to fluid mechanics and describes the conservation of mass?

Accepted Answer

Continuity equation

Answer

Bernoulli's equation

Answer

Navier-Stokes equations

Answer

Euler's equation

Question 31

Which property characterizes fluids that exhibit constant viscosity regardless of the shear rate?

Accepted Answer

Newtonian behavior

Answer

Non-Newtonian behavior

Answer

Viscoelastic behavior

Answer

Thixotropic behavior

Question 32

In a constant cross-section pipe flow of an incompressible fluid, which statement accurately describes the mass flow rate?

Accepted Answer

It is constant throughout the pipe

Answer

It is proportional to the fluid velocity

Answer

It is inversely proportional to the fluid pressure

Answer

It varies linearly with the pipe diameter

Question 33

Which substance exemplifies a non-Newtonian fluid?

Accepted Answer

Honey

Answer

Water

Answer

Air

Answer

Mercury

Question 34

In a Venturi meter, the pressure drop across the device exhibits what relationship with the flow rate?

Accepted Answer

Proportional to the square of the flow rate

Answer

Inversely proportional to the flow rate

Answer

Independent of the flow rate

Answer

Linearly proportional to the flow rate

Question 35

Which boundary condition represents the 'no-slip' condition at a solid surface in fluid mechanics?

Accepted Answer

Zero velocity at the surface

Answer

Zero pressure gradient at the surface

Answer

Zero shear stress at the surface

Answer

Zero temperature gradient at the surface

Question 36

For a fluid flowing in a circular pipe, which velocity profile characterizes laminar flow?

Accepted Answer

Parabolic

Answer

Uniform

Answer

Exponential

Answer

Triangular

Question 37

Which of the following equations expresses the conservation of mass in fluid mechanics?

Accepted Answer

Continuity equation

Answer

Navier-Stokes equations

Answer

Euler equations

Answer

Bernoulli equation

Question 38

Which of the following is NOT a fluid property?

Accepted Answer

Refractive index

Answer

Density

Answer

Viscosity

Answer

Compressibility

Question 39

A non-Newtonian fluid is characterized by:

Accepted Answer

Shear-thinning behavior

Answer

Constant viscosity

Answer

Linear relationship between shear stress and strain rate

Answer

Newtonian behavior

Question 40

Which of the following fluids is typically classified as compressible?

Accepted Answer

Air

Answer

Water

Answer

Honey

Answer

Glycerin

Question 41

The Boussinesq approximation assumes that:

Accepted Answer

Density variations are negligible except in the buoyancy term

Answer

Density variations are significant in the momentum equation

Answer

Velocity changes are small compared to the speed of sound

Answer

Viscosity is constant

Question 42

The divergence of velocity in an incompressible flow field is:

Accepted Answer

Zero

Answer

Non-zero

Answer

Positive

Answer

Negative

Question 43

The Reynolds number is a dimensionless parameter that characterizes:

Accepted Answer

Flow regime

Answer

Fluid density

Answer

Flow velocity

Answer

Pipe diameter

Question 44

Which of the following is a fundamental property of fluids?

Accepted Answer

Fluids exert pressure in all directions.

Answer

Fluids are perfectly rigid.

Answer

Fluids have constant volume.

Answer

Fluids have elasticity.

Question 45

What is the primary distinction between a liquid and a gas?

Accepted Answer

Liquids have a definite volume and a fixed shape, while gases have no definite volume or shape.

Answer

Liquids are denser than gases.

Answer

Liquids are incompressible, while gases are compressible.

Question 46

Which of the following is an example of a non-Newtonian fluid?

Accepted Answer

Honey

Answer

Mercury

Answer

Air

Answer

Water

Question 47

Viscosity is a measure of a fluid's:

Accepted Answer

Resistance to flow.

Answer

Temperature

Answer

Pressure

Answer

Density

Question 48

According to Pascal's Law, pressure applied to a confined fluid:

Accepted Answer

Transmits equally in all directions throughout the fluid.

Answer

Depends on the fluid's volume.

Answer

Is highest at the bottom of the fluid.

Answer

Is inversely proportional to the fluid's depth.

Question 49

The buoyant force acting on an object submerged in a fluid is equal to:

Accepted Answer

The weight of the fluid displaced by the object.

Answer

The density of the object.

Answer

The volume of the object.

Answer

The pressure at the bottom of the fluid.

Question 50

The continuity equation in fluid mechanics expresses the principle of conservation of:

Accepted Answer

Mass.

Answer

Volume.

Answer

Energy.

Answer

Momentum.

Question 51

Bernoulli's principle states that as the speed of a fluid increases:

Accepted Answer

The fluid pressure decreases.

Answer

The fluid's density increases.

Answer

The fluid's temperature increases.

Answer

The fluid's velocity decreases.

Question 52

A fluid with high surface tension tends to:

Accepted Answer

Minimize its surface area.

Answer

Increase its viscosity.

Answer

Lower its density.

Answer

Maximize its volume.

Question 53

The Reynolds number is a dimensionless parameter used to characterize:

Accepted Answer

The flow regime of a fluid (laminar or turbulent).

Answer

The specific gravity of a fluid.

Answer

The thermal conductivity of a fluid.

Answer

The compressibility of a fluid.