Newtonian and Non-Newtonian Fluids: Interactive Learning Quizzes

Question 1

Which of the following fluids exhibits a constant viscosity regardless of the shear rate applied to it?

Accepted Answer

Water

Answer

Honey

Answer

Ketchup

Answer

Toothpaste

Question 2

The SI unit of dynamic viscosity is:

Accepted Answer

Newton-second per square metre

Answer

Pascal

Answer

Poiseuille

Answer

Stokes

Question 3

Which of the following is NOT a type of non-Newtonian fluid?

Accepted Answer

Newtonian

Answer

Dilatant

Answer

Pseudoplastic

Answer

Elastic

Question 4

What is the behaviour of a dilatant fluid under increasing shear stress?

Accepted Answer

Its viscosity increases

Answer

Its viscosity decreases

Answer

Its density increases

Answer

Its velocity increases

Question 5

Which of the following factors does NOT influence the viscosity of a fluid?

Accepted Answer

Velocity

Answer

Temperature

Answer

Pressure

Answer

Molecular structure

Question 6

The Reynolds number in fluid mechanics is:

Accepted Answer

A dimensionless quantity that helps predict the flow regime

Answer

Used to calculate the pressure drop in a pipe

Answer

A measure of the fluid's density

Answer

Used to determine the thermal conductivity of a fluid

Question 7

Which of the following does NOT influence the viscosity of a fluid?

Accepted Answer

Shear rate (for Newtonian fluids)

Answer

Temperature

Answer

Pressure

Answer

Solute concentration

Question 8

Identify the flow regime characterised by laminar flow in the central section and turbulent flow near the boundaries:

Accepted Answer

Boundary layer flow

Answer

Fully laminar flow

Answer

Turbulent flow

Answer

Plug flow

Question 9

The Navier-Stokes equations describe:

Accepted Answer

The motion of viscous fluids

Answer

The flow of inviscid fluids

Answer

The behaviour of elastic solids

Answer

Heat and mass transport

Question 10

Which of the following statements correctly describes the relationship between shear stress and shear rate for a Newtonian fluid?

Accepted Answer

Shear stress is directly proportional to shear rate

Answer

Shear stress is inversely proportional to shear rate

Answer

Shear stress is independent of shear rate

Answer

The relationship between shear stress and shear rate is exponential

Question 11

Which of the following is a characteristic of a shear thinning non-Newtonian fluid?

Accepted Answer

Viscosity decreases with increasing shear rate

Answer

Constant viscosity

Answer

Viscosity increases with increasing shear rate

Answer

No yield stress

Question 12

How does the power law index influence the flow behavior of non-Newtonian fluids?

Accepted Answer

It determines if the fluid thins or thickens under shear stress.

Answer

It is directly proportional to the fluid's viscosity.

Answer

It remains constant for all non-Newtonian fluids.

Answer

It has no impact on the fluid's flow behavior.

Question 13

Define yield stress and explain its significance in distinguishing the behavior of non-Newtonian fluids.

Accepted Answer

Yield stress is the minimum shear stress needed to initiate flow in a fluid, differentiating certain non-Newtonian fluids from Newtonian fluids.

Answer

Yield stress is the maximum shear stress a fluid can withstand before breaking.

Answer

Yield stress measures a fluid's viscosity.

Answer

Yield stress applies exclusively to Newtonian fluids.

Question 14

Which characteristic factor predominantly influences the viscosity of a fluid?

Accepted Answer

Temperature

Answer

Density

Answer

Pressure

Answer

Velocity

Question 15

Classify the fluid that exhibits an increase in viscosity with increasing shear stress:

Accepted Answer

Shear-thickening fluid

Answer

Shear-thinning fluid

Answer

Newtonian fluid

Answer

Ideal plastic fluid

Question 16

In the context of Bingham plastics, what is the term for the shear stress required to initiate flow?

Accepted Answer

Yield stress

Answer

Flow stress

Answer

Rheological constant

Answer

Plastic viscosity

Question 17

Which characteristic is a defining feature of Newtonian fluids?

Accepted Answer

Linear relationship between shear stress and shear rate

Answer

Yields under applied force

Answer

Viscosity is dependent on shear stress

Question 18

Which flow regime is characterized by laminar flow and a velocity profile that assumes a parabolic shape?

Accepted Answer

Poiseuille flow

Answer

Turbulent flow

Answer

Couette flow

Answer

Taylor flow

Question 19

What effect does the addition of polymers typically have on the viscosity of a Newtonian fluid?

Accepted Answer

Increase in viscosity

Answer

Phase change

Answer

Decrease in viscosity

Answer

No change in viscosity

Question 20

What primary mechanism is responsible for the shear-thinning behaviour exhibited by blood?

Accepted Answer

Alignment of red blood cells with the direction of flow

Answer

Increased viscosity with increasing temperature

Answer

High concentration of suspended solids

Answer

Negligible yield stress