# 11th Class Physics Chapter 6 MCQs with Answers

Welcome to the **11th Class Physics Chapter 6 MCQs Practice and Quiz Tests**. We are presenting you with top MCQ questions from the **11th Class Physics Chapter 6 Fluid Dynamics.**

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Which property of a fluid determines its resistance to flow?

a) Viscosity

b) Density

c) Surface tension

d) Temperature

What is the equation used to calculate the pressure at a point within a static fluid?

a) Pascal’s law

b) Bernoulli’s equation

c) Navier-Stokes equation

d) Archimedes’ principle

In a streamline flow, the velocity of fluid particles at any point is:

a) Constant

b) Increasing

c) Decreasing

d) Random

Which of the following states that the total energy of an ideal fluid flowing in a horizontal streamline is constant?

a) Pascal’s law

b) Archimedes’ principle

c) Torricelli’s theorem

d) Bernoulli’s equation

What is the SI unit of viscosity?

a) kg/m³

b) N/m²

c) N·s/m²

d) m²/s

The critical Reynolds number for the transition from laminar to turbulent flow is typically around:

a) 100

b) 500

c) 1000

d) 2000

The phenomenon of “capillarity” is primarily due to:

a) Gravity

b) Surface tension

c) Viscosity

d) Buoyancy

What does the Euler number (Eu) represent in fluid dynamics?

a) Reynolds number

b) Mach number

c) Froude number

d) Weber number

Which type of flow is characterized by irregular fluctuations in velocity and pressure over time?

a) Laminar flow

b) Steady flow

c) Turbulent flow

d) Compressible flow

The pressure of a fluid in motion decreases when its:

a) Velocity increases

b) Velocity decreases

c) Density decreases

d) Density increases

The property of a fluid that causes it to resist a change in its state of motion is called:

a) Viscosity

b) Surface tension

c) Inertia

d) Density

The streamline flow of a fluid becomes turbulent when the Reynolds number exceeds:

a) 1000

b) 2000

c) 3000

d) 4000

What is the principle behind how airplanes generate lift?

a) Bernoulli’s principle

b) Pascal’s law

c) Archimedes’ principle

d) Ohm’s law

The device used to measure atmospheric pressure is called a:

a) Barometer

b) Thermometer

c) Manometer

d) Hygrometer

The term “viscosity” is used to describe a fluid’s resistance to:

a) Flow

b) Compression

c) Expansion

d) Radiation

Which type of flow is characterized by smooth and parallel layers of fluid?

a) Laminar flow

b) Turbulent flow

c) Transient flow

d) Compressible flow

The buoyant force acting on an object submerged in a fluid depends on the:

a) Density of the fluid

b) Mass of the object

c) Volume of the object

d) Acceleration due to gravity

Which law states that the pressure applied to a confined fluid is transmitted undiminished throughout the fluid in all directions?

a) Archimedes’ principle

b) Pascal’s law

c) Hooke’s law

d) Newton’s law of viscosity

The rate of flow of a fluid through a pipe is directly proportional to the pressure difference and inversely proportional to the viscosity and length of the pipe. This statement is known as:

a) Newton’s law of cooling

b) Newton’s law of viscosity

c) Poiseuille’s law

d) Boyle’s law

The point at which a fluid flow’s velocity reaches the speed of sound is called the:

a) Choke point

b) Critical point

c) Sonic point

d) Mach point

The measure of the ratio of inertial forces to viscous forces in a fluid is given by the:

a) Weber number

b) Mach number

c) Froude number

d) Reynolds number

A flow in which the fluid density remains constant along streamlines is known as:

a) Steady flow

b) Incompressible flow

c) Compressible flow

d) Turbulent flow

Which term describes the pressure exerted by a fluid at rest due to the force of gravity?

a) Hydrostatic pressure

b) Dynamic pressure

c) Atmospheric pressure

d) Absolute pressure

What type of fluid flow occurs when the fluid particles move in a random fashion with time?

a) Laminar flow

b) Steady flow

c) Turbulent flow

d) Transient flow

What is the ratio of the velocity of a fluid in a pipe to the velocity of sound in that fluid known as?

a) Reynolds number

b) Mach number

c) Weber number

d) Froude number

What is the SI unit of surface tension?

a) N/m

b) N/m²

c) N/m³

d) N/m⁴

The phenomenon of water rising in a narrow tube against gravity is an example of:

a) Capillary action

b) Bernoulli’s principle

c) Pascal’s law

d) Archimedes’ principle

In which type of flow does the fluid move in parallel layers without any disruption between the layers?

a) Steady flow

b) Turbulent flow

c) Compressible flow

d) Laminar flow

What does the Weber number (We) represent in fluid dynamics?

a) Viscosity

b) Surface tension

c) Density

d) Inertia

Which term describes the force exerted by a fluid per unit area on the surface it comes into contact with?

a) Viscosity

b) Pressure

c) Surface tension

d) Buoyancy

The process of using a venturi meter is based on which principle?

a) Bernoulli’s principle

b) Pascal’s law

c) Archimedes’ principle

d) Hooke’s law

The equation used to calculate the lift force on an object in a fluid flow is known as:

a) Bernoulli’s equation

b) Euler’s equation

c) Laplace’s equation

d) Navier-Stokes equation

The measure of a fluid’s resistance to shear stress is known as:

a) Density

b) Viscosity

c) Surface tension

d) Compressibility

Which law explains the buoyant force experienced by an object immersed in a fluid?

a) Ohm’s law

b) Newton’s law of cooling

c) Pascal’s law

d) Archimedes’ principle

The flow of a fluid is said to be “steady” if:

a) Its velocity changes over time

b) Its pressure changes over time

c) Its velocity and pressure change over time

d) Its velocity and pressure remain constant over time

What is the name of the device used to measure the velocity of a fluid flow?

a) Thermometer

b) Barometer

c) Manometer

d) Pitot tube

The measure of the ratio of the inertial force to the gravitational force acting on a fluid is called the:

a) Reynolds number

b) Froude number

c) Mach number

d) Weber number

The point at which the velocity of a fluid flow becomes zero is known as:

a) Critical point

b) Choke point

c) Stagnation point

d) Inflection point

Which law explains the upward force exerted by a fluid on a body fully or partially immersed in it?

a) Ohm’s law

b) Pascal’s law

c) Archimedes’ principle

d) Newton’s law of cooling

The force that opposes the motion of one layer of a fluid over another layer is called:

a) Surface tension

b) Viscosity

c) Inertia

d) Gravity

Which equation is used to calculate the pressure difference between two points in a fluid flow due to the difference in height?

a) Navier-Stokes equation

b) Bernoulli’s equation

c) Poiseuille’s law

d) Hagen-Poiseuille equation

In a fluid flow, the point where the pressure is minimum is called the:

a) Stagnation point

b) Choke point

c) Separation point

d) Critical point

The SI unit of flow rate is:

a) kg/m³

b) m²/s

c) N/m²

d) m³/s

The process of gas bubbles sticking to the walls of a pipe and reducing the flow area is known as:

a) Viscosity

b) Cavitation

c) Turbulence

d) Compressibility

What is the critical velocity required to initiate the flow of a fluid through a pipe?

a) Terminal velocity

b) Minimum velocity

c) Escape velocity

d) Threshold velocity

Which of the following is used to measure the dynamic pressure of a fluid flow?

a) Thermometer

b) Barometer

c) Manometer

d) Pitot tube

Which equation describes the relationship between the pressure and velocity of a fluid in motion?

a) Pascal’s law

b) Bernoulli’s equation

c) Navier-Stokes equation

d) Archimedes’ principle

The coefficient of viscosity is also known as:

a) Dynamic viscosity

b) Kinematic viscosity

c) Absolute viscosity

d) Relative viscosity

Which law states that the force required to move a plate horizontally through a fluid is

directly proportional to the plate’s velocity and the viscosity of the fluid?

a) Newton’s law of cooling

b) Hooke’s law

c) Newton’s law of viscosity

d) Boyle’s law

The point at which the velocity of a fluid flow reaches the speed of sound is called the:

a) Sonic point

b) Critical point

c) Mach point

d) Choke point

Which property of a fluid is responsible for its cohesive behavior and allows insects to walk on water?

a) Viscosity

b) Surface tension

c) Inertia

d) Density

The type of flow in which the fluid particles follow a specific path and do not cross each other is called:

a) Turbulent flow

b) Laminar flow

c) Steady flow

d) Transient flow

Which of the following is used to measure the density of a fluid?

a) Manometer

b) Hygrometer

c) Thermometer

d) Hydrometer

The flow in which the fluid particles follow erratic paths and create eddies is known as:

a) Laminar flow

b) Transient flow

c) Turbulent flow

d) Steady flow

The unit of kinematic viscosity is:

a) N/m

b) N/m²

c) m²/s

d) N·s/m²

Which law states that the buoyant force on an object submerged in a fluid is equal to the weight of the displaced fluid?

a) Ohm’s law

b) Newton’s law of cooling

c) Archimedes’ principle

d) Pascal’s law

The phenomenon of a liquid rising or falling in a narrow tube due to the combination of adhesion and cohesion is called:

a) Capillary action

b) Viscosity

c) Cavitation

d) Turbulence

What type of fluid flow occurs when the fluid particles follow smooth and orderly paths?

a) Laminar flow

b) Transient flow

c) Turbulent flow

d) Steady flow

Which equation is used to calculate the drag force experienced by an object moving through a fluid?

a) Bernoulli’s equation

b) Navier-Stokes equation

c) Stokes’ law

d) Hagen-Poiseuille equation

The weight of a liquid displaced by an object immersed in it is known as:

a) Dynamic pressure

b) Buoyant force

c) Hydrostatic pressure

d) Viscous force

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