Physics

Viscosity and Fluid Resistance MCQs with Answer

What is the SI unit of viscosity?
a) Pascal-second (Pa·s)
b) Newton-meter (N·m)
c) Joule-second (J·s)
d) Watt-second (W·s)

Which of the following fluids has the highest viscosity?
a) Water
b) Honey
c) Air
d) Alcohol

What happens to the viscosity of a liquid when temperature increases?
a) Increases
b) Decreases
c) Remains the same
d) First increases, then decreases

What happens to the viscosity of gases with an increase in temperature?
a) Increases
b) Decreases
c) Remains constant
d) First increases, then decreases

Which law describes the force required to move a plate in a viscous fluid?
a) Newton’s Law of Cooling
b) Stokes’ Law
c) Pascal’s Law
d) Newton’s Law of Viscosity

What is the unit of kinematic viscosity?
a) Pascal-second (Pa·s)
b) Stokes (St)
c) Newton-second (N·s)
d) Joule-second (J·s)

Which of the following statements about viscosity is true?
a) It is the resistance to deformation in solids
b) It is the measure of a fluid’s resistance to flow
c) It depends only on temperature
d) It remains constant for all fluids

The viscosity of an ideal fluid is:
a) Zero
b) Very high
c) Infinite
d) Unpredictable

Which equation is used to determine the terminal velocity of a particle in a fluid?
a) Bernoulli’s equation
b) Stokes’ law
c) Navier-Stokes equation
d) Pascal’s law

What is the primary factor affecting the viscosity of a liquid?
a) Pressure
b) Temperature
c) Density
d) Gravity

Which force opposes the motion of an object moving through a fluid?
a) Buoyant force
b) Viscous force
c) Centripetal force
d) Magnetic force

The ratio of dynamic viscosity to density is called:
a) Surface tension
b) Kinematic viscosity
c) Reynolds number
d) Specific gravity

In laminar flow, the velocity profile of a viscous fluid in a pipe is:
a) Uniform across the section
b) Maximum at the center and zero at the walls
c) Zero throughout
d) Maximum at the walls and zero at the center

Which property of a fluid determines whether the flow is laminar or turbulent?
a) Surface tension
b) Reynolds number
c) Viscosity
d) Density

Which device is used to measure viscosity?
a) Manometer
b) Viscometer
c) Barometer
d) Hydrometer

If Reynolds number is less than 2000, the flow is:
a) Turbulent
b) Laminar
c) Supersonic
d) Unstable

Which of the following fluids exhibits Newtonian behavior?
a) Blood
b) Water
c) Honey
d) Paint

A fluid with increasing viscosity as shear stress increases is called:
a) Newtonian fluid
b) Thixotropic fluid
c) Dilatant fluid
d) Ideal fluid

What is the characteristic of a pseudoplastic fluid?
a) Viscosity increases with increasing shear stress
b) Viscosity decreases with increasing shear stress
c) Viscosity remains constant
d) Viscosity is zero

Which of the following fluids does not follow Newton’s law of viscosity?
a) Water
b) Air
c) Blood
d) Oil

Which layer in a moving fluid experiences zero velocity?
a) Center of the pipe
b) At the free surface
c) Boundary layer near a solid surface
d) Everywhere in the flow

Which factor does not affect the viscosity of a liquid?
a) Temperature
b) Pressure
c) Molecular structure
d) Altitude

The drag force experienced by a sphere moving in a fluid is given by:
a) Bernoulli’s theorem
b) Newton’s second law
c) Stokes’ law
d) Pascal’s principle

In turbulent flow, viscosity is:
a) The only factor influencing resistance
b) Negligible
c) Important but secondary to inertia
d) Constant throughout

Which dimensionless number is used to predict flow regime in a pipe?
a) Mach number
b) Reynolds number
c) Prandtl number
d) Schmidt number

Which type of flow has irregular and chaotic fluid motion?
a) Laminar flow
b) Turbulent flow
c) Steady flow
d) Compressible flow

A decrease in temperature causes the viscosity of a gas to:
a) Increase
b) Decrease
c) Remain constant
d) Fluctuate randomly

Which term describes the internal friction within a fluid?
a) Density
b) Viscosity
c) Surface tension
d) Buoyancy

Which principle states that pressure is transmitted uniformly in a confined fluid?
a) Bernoulli’s principle
b) Pascal’s principle
c) Archimedes’ principle
d) Newton’s third law

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