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
