# Fluid Mechanics Applications MCQs with Answers

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## Fluid Mechanics Applications Online MCQs with Answers

Which of the following is an application of fluid mechanics?
a) Aerodynamics
b) Thermodynamics
c) Electromagnetism
d) Quantum mechanics

a) Aerodynamics

In which field is Bernoulli’s principle commonly applied?
a) Plumbing
b) Electrical engineering
c) Structural engineering
d) Computer science

a) Plumbing

Which fluid mechanics principle explains the upward buoyant force experienced by objects submerged in a fluid?
a) Pascal’s principle
b) Archimedes’ principle
c) Bernoulli’s principle
d) Newton’s second law of motion

b) Archimedes’ principle

What is the main principle behind the operation of hydraulic systems?
a) Boyle’s law
b) Hooke’s law
c) Pascal’s principle
d) Bernoulli’s principle

c) Pascal’s principle

Which branch of fluid mechanics deals with the study of fluid flow in pipes and channels?
a) Hydrodynamics
b) Aerodynamics
c) Fluid statics
d) Fluid kinematics

a) Hydrodynamics

Which phenomenon is responsible for the flow of fluid through a straw when we suck on it?
a) Viscosity
b) Capillary action
c) Surface tension
d) Bernoulli’s principle

d) Bernoulli’s principle

Which type of fluid flow is characterized by smooth, layered motion with no mixing between adjacent layers?
a) Turbulent flow
b) Laminar flow
c) Transitional flow
d) Viscous flow

b) Laminar flow

Which factor affects the viscosity of a fluid?
a) Temperature
b) Pressure
c) Density
d) Velocity

a) Temperature

Which law states that the velocity of a fluid flowing through a pipe is inversely proportional to the cross-sectional area of the pipe?
a) Hooke’s law
b) Ohm’s law
c) Bernoulli’s law
d) Poiseuille’s law

d) Poiseuille’s law

Which instrument is commonly used to measure the pressure of a fluid?
a) Thermometer
b) Barometer
c) Manometer
d) Hydrometer

c) Manometer

Which principle explains the phenomenon of capillary rise in a narrow tube?
a) Pascal’s principle
b) Bernoulli’s principle
c) Archimedes’ principle
d) Capillary action

d) Capillary action

What is the term for the resistance encountered by a fluid flowing through a pipe due to its internal friction?
a) Viscosity
b) Surface tension
c) Cohesion

a) Viscosity

Which type of fluid flow is characterized by chaotic, irregular motion with mixing between adjacent layers?
a) Laminar flow
b) Turbulent flow
c) Transitional flow
d) Viscous flow

b) Turbulent flow

What is the term for the force per unit area exerted by a fluid on the walls of its container?
a) Pressure
b) Viscosity
c) Surface tension
d) Cohesion

a) Pressure

Which principle states that the total energy of a fluid flowing in a streamline remains constant?
a) Pascal’s principle
b) Bernoulli’s principle
c) Archimedes’ principle
d) Newton’s second law of motion

b) Bernoulli’s principle

Which factor affects the buoyant force experienced by an object submerged in a fluid?
a) Density of the object
b) Volume of the object
c) Acceleration due to gravity
d) Density of the fluid

d) Density of the fluid

Which equation relates the pressure, velocity, and height of a fluid in a continuous flow system?
a) Boyle’s law
b) Hooke’s law
c) Pascal’s law
d) Bernoulli’s equation

d) Bernoulli’s equation

Which phenomenon is responsible for the upward movement of water in a plant against gravity?
a) Capillary action
b) Surface tension
c) Osmosis
d) Transpiration

d) Transpiration

Which principle explains the force experienced by an object moving through a fluid due to the difference in fluid pressure on its front and back surfaces?
a) Pascal’s principle
b) Bernoulli’s principle
c) Archimedes’ principle
d) Newton’s third law of motion

b) Bernoulli’s principle

Which instrument is commonly used to measure the flow rate of a fluid?
a) Thermometer
b) Barometer
c) Manometer
d) Flowmeter

d) Flowmeter

What is the term for the resistance of a fluid to flow?
a) Viscosity
b) Density
c) Surface tension
d) Pressure

a) Viscosity

Which principle explains the rise of a liquid in a narrow tube inserted into a container of the same liquid?
a) Pascal’s principle
b) Bernoulli’s principle
c) Archimedes’ principle
d) Capillary action

d) Capillary action

Which equation represents the relationship between the pressure, velocity, and height of a fluid in a pipe?
a) Poiseuille’s law
b) Bernoulli’s equation
c) Archimedes’ principle
d) Pascal’s principle

b) Bernoulli’s equation

Which type of flow occurs when the Reynolds number exceeds a critical value?
a) Laminar flow
b) Turbulent flow
c) Transitional flow
d) Viscous flow

b) Turbulent flow

Which principle explains the relationship between the pressure and velocity of a fluid flowing in a pipe?
a) Pascal’s principle
b) Bernoulli’s principle
c) Archimedes’ principle
d) Newton’s second law of motion

b) Bernoulli’s principle

Which factor affects the flow rate of a fluid through a pipe?
a) Length of the pipe
b) Diameter of the pipe
c) Temperature of the fluid
d) Density of the fluid

b) Diameter of the pipe

What is the term for the force per unit area exerted by a fluid perpendicular to its flow direction?
a) Pressure
b) Viscosity
c) Surface tension
d) Cohesion

a) Pressure

Which equation relates the pressure, volume, and temperature of a fluid at a constant mass?
a) Boyle’s law
b) Charles’s law
c) Archimedes’ law
d) Pascal’s law

a) Boyle’s law

Which principle explains the force experienced by an object moving through a fluid due to its weight?
a) Pascal’s principle
b) Bernoulli’s principle
c) Archimedes’ principle
d) Newton’s second law of motion

c) Archimedes’ principle

Which instrument is commonly used to measure the viscosity of a fluid?
a) Thermometer
b) Barometer
c) Viscometer
d) Hydrometer

c) Viscometer

What is the term for the force per unit area exerted by a fluid tangentially to its flow direction?
a) Pressure
b) Viscosity
c) Surface tension
d) Cohesion

b) Viscosity

Which phenomenon is responsible for the spherical shape of liquid droplets?
a) Viscosity
b) Surface tension
c) Capillary action
d) Bernoulli’s principle

b) Surface tension

Which law states that the pressure of a fluid decreases as its velocity increases?
a) Boyle’s law
b) Hooke’s law
c) Bernoulli’s law
d) Poiseuille’s law

c) Bernoulli’s law

Which factor affects the flow velocity of a fluid through a pipe?
a) Length of the pipe
b) Diameter of the pipe
c) Temperature of the fluid
d) Density of the fluid

b) Diameter of the pipe

Which principle explains the decrease in pressure experienced by a fluid as its velocity increases?
a) Pascal’s principle
b) Bernoulli’s principle
c) Archimedes’ principle
d) Newton’s second law of motion

b) Bernoulli’s principle

What is the term for the force per unit area exerted by a fluid at rest?
a) Pressure
b) Viscosity
c) Surface tension
d) Cohesion

a) Pressure

Which equation relates the pressure, volume, and temperature of a gas at a constant pressure?
a) Boyle’s law
b) Charles’s law
c) Archimedes’ law
d) Pascal’s law

b) Charles’s law

Which principle explains the rise of a liquid in a narrow tube against gravity?
a) Pascal’s principle
b) Bernoulli’s principle
c) Archimedes’ principle
d) Capillary action

d) Capillary action

What is the term for the force per unit area exerted by a fluid at a depth in a fluid column?
a) Pressure
b) Viscosity
c) Surface tension
d) Cohesion

a) Pressure

Which phenomenon is responsible for the cohesive behavior of water molecules?
a) Viscosity
b) Surface tension
c) Capillary action
d) Bernoulli’s principle

b) Surface tension

What is the application of Bernoulli’s equation in fluid mechanics?
a) Determining fluid velocity in a pipe
b) Calculating pressure drop in a pipe
c) Analyzing flow rate through an orifice
d) Predicting flow behavior around an airfoil

a) Determining fluid velocity in a pipe

What is the purpose of a venturi meter?
a) Measuring fluid flow rate
b) Determining fluid viscosity
c) Analyzing fluid pressure distribution
d) Calculating fluid density

a) Measuring fluid flow rate

Which principle is used in hydraulic systems to amplify force?
a) Pascal’s principle
b) Archimedes’ principle
c) Bernoulli’s principle
d) Newton’s second law of motion

a) Pascal’s principle

What is the purpose of a pitot tube?
a) Measuring fluid pressure
b) Determining fluid velocity
c) Analyzing fluid viscosity
d) Calculating fluid density

b) Determining fluid velocity

How is the Reynolds number used in fluid mechanics?
a) To determine laminar or turbulent flow
b) To calculate fluid density
c) To analyze fluid pressure distribution
d) To measure fluid viscosity

a) To determine laminar or turbulent flow

What is the application of Archimedes’ principle in fluid mechanics?
a) Analyzing fluid pressure distribution
b) Measuring fluid viscosity
c) Determining fluid velocity
d) Calculating buoyant force on a submerged object

d) Calculating buoyant force on a submerged object

What is the purpose of a manometer in fluid mechanics?
a) Measuring fluid flow rate
b) Analyzing fluid pressure distribution
c) Determining fluid viscosity
d) Calculating fluid density

b) Analyzing fluid pressure distribution

What is the application of Pascal’s principle in fluid mechanics?
a) Measuring fluid flow rate
b) Analyzing fluid pressure distribution
c) Determining fluid viscosity
d) Calculating fluid density

b) Analyzing fluid pressure distribution

What is the purpose of a flow meter in fluid mechanics?
a) Measuring fluid flow rate
b) Determining fluid viscosity
c) Analyzing fluid pressure distribution
d) Calculating fluid density

a) Measuring fluid flow rate

How is the Euler’s equation used in fluid mechanics?
a) To calculate fluid viscosity
b) To determine laminar or turbulent flow
c) To analyze fluid pressure distribution
d) To measure fluid velocity

c) To analyze fluid pressure distribution

What is the application of a weir in fluid mechanics?
a) Measuring fluid flow rate
b) Analyzing fluid pressure distribution
c) Determining fluid viscosity
d) Calculating fluid density

a) Measuring fluid flow rate

What is the purpose of a diffuser in fluid mechanics?
a) Measuring fluid flow rate
b) Determining fluid viscosity
c) Analyzing fluid pressure distribution
d) Calculating fluid density

c) Analyzing fluid pressure distribution

How is the Venturi effect used in fluid mechanics?
a) To measure fluid viscosity
b) To calculate fluid density
c) To analyze fluid pressure distribution
d) To determine laminar or turbulent flow

c) To analyze fluid pressure distribution

What is the application of a flow nozzle in fluid mechanics?
a) Measuring fluid flow rate
b) Analyzing fluid pressure distribution
c) Determining fluid viscosity
d) Calculating fluid density

a) Measuring fluid flow rate

What is the purpose of a stream function in fluid mechanics?
a) To measure fluid flow rate
b) To calculate fluid density
c) To analyze fluid pressure distribution
d) To determine laminar or turbulent flow

d) To determine laminar or turbulent flow

What is the application of a pitot-static tube in fluid mechanics?
a) Measuring fluid flow rate
b) Analyzing fluid pressure distribution
c) Determining fluid viscosity
d) Calculating fluid density

b) Analyzing fluid pressure distribution

How is the continuity equation used in fluid mechanics?
a) To measure fluid flow rate
b) To calculate fluid density
c) To analyze fluid pressure distribution
d) To determine laminar or turbulent flow

a) To measure fluid flow rate

What is the purpose of a flow visualization technique in fluid mechanics?
a) Measuring fluid flow rate
b) Determining fluid viscosity
c) Analyzing fluid pressure distribution
d) Observing fluid flow patterns

d) Observing fluid flow patterns

What is the application of a vortex flow meter in fluid mechanics?
a) Measuring fluid flow rate
b) Analyzing fluid pressure distribution
c) Determining fluid viscosity
d) Calculating fluid density

a) Measuring fluid flow rate

How is the Navier-Stokes equation used in fluid mechanics?
a) To measure fluid flow rate
b) To calculate fluid density
c) To analyze fluid pressure distribution
d) To determine laminar or turbulent flow

d) To determine laminar or turbulent flow

What is the application of a hydraulic jump in fluid mechanics?
a) Measuring fluid flow rate
b) Analyzing fluid pressure distribution
c) Determining fluid viscosity
d) Studying changes in flow behavior

d) Studying changes in flow behavior

What is the purpose of a pitot-static probe in fluid mechanics?
a) Measuring fluid flow rate
b) Analyzing fluid pressure distribution
c) Determining fluid viscosity
d) Calculating fluid density

b) Analyzing fluid pressure distribution

How is the boundary layer concept used in fluid mechanics?
a) To measure fluid flow rate
b) To calculate fluid density
c) To analyze fluid pressure distribution
d) To study fluid flow near a solid surface

d) To study fluid flow near a solid surface

What is the application of a flow control valve in fluid mechanics?
a) Measuring fluid flow rate
b) Analyzing fluid pressure distribution
c) Determining fluid viscosity
d) Controlling fluid flow rate

d) Controlling fluid flow rate

What is the purpose of a drag coefficient in fluid mechanics?
a) Measuring fluid flow rate
b) Calculating fluid viscosity
c) Analyzing fluid pressure distribution
d) Characterizing fluid flow resistance

d) Characterizing fluid flow resistance

What is the application of a hydraulic turbine in fluid mechanics?
a) Measuring fluid flow rate
b) Analyzing fluid pressure distribution
c) Determining fluid viscosity
d) Converting fluid energy into mechanical work

d) Converting fluid energy into mechanical work

How is the cavitation phenomenon important in fluid mechanics?
a) To measure fluid flow rate
b) To calculate fluid density
c) To analyze fluid pressure distribution
d) To avoid damage to equipment due to vapor bubble collapse

d) To avoid damage to equipment due to vapor bubble collapse

What is the purpose of a flow straightener in fluid mechanics?
a) Measuring fluid flow rate
b) Analyzing fluid pressure distribution
c) Determining fluid viscosity
d) Ensuring laminar flow conditions

d) Ensuring laminar flow conditions

What is the application of a drag force in fluid mechanics?
a) Measuring fluid flow rate
b) Analyzing fluid pressure distribution
c) Determining fluid viscosity
d) Opposing the motion of a solid object through a fluid

d) Opposing the motion of a solid object through a fluid

How is the hydraulic radius used in fluid mechanics?
a) To measure fluid flow rate
b) To calculate fluid density
c) To analyze fluid pressure distribution
d) To determine the resistance to flow in a channel

d) To determine the resistance to flow in a channel

What is the application of a hydraulic press in fluid mechanics?
a) Measuring fluid flow rate
b) Analyzing fluid pressure distribution
c) Determining fluid viscosity
d) Generating high mechanical forces using fluid pressure

d) Generating high mechanical forces using fluid pressure

What is the purpose of a rotameter in fluid mechanics?
a) Measuring fluid flow rate
b) Determining fluid viscosity
c) Analyzing fluid pressure distribution
d) Calculating fluid density

a) Measuring fluid flow rate

How is the drag coefficient determined in fluid mechanics?
a) Through experimental testing
b) By calculating fluid viscosity
c) By analyzing fluid pressure distribution
d) Based on fluid flow rate measurements

a) Through experimental testing

What is the application of a siphon in fluid mechanics?
a) Measuring fluid flow rate
b) Analyzing fluid pressure distribution
c) Transferring fluid from a higher to lower level
d) Calculating fluid density

c) Transferring fluid from a higher to lower level

How is the hydraulic gradient used in fluid mechanics?
a) To measure fluid flow rate
b) To calculate fluid density
c) To analyze fluid pressure distribution
d) To determine the direction and magnitude of flow in a pipe

d) To determine the direction and magnitude of flow in a pipe

What is the purpose of a flow control valve in fluid mechanics?
a) Measuring fluid flow rate
b) Analyzing fluid pressure distribution
c) Determining fluid viscosity
d) Controlling fluid flow rate

d) Controlling fluid flow rate

What is the application of a flowmeter in fluid mechanics?
a) Measuring fluid flow rate
b) Determining fluid viscosity
c) Analyzing fluid pressure distribution
d) Calculating fluid density

a) Measuring fluid flow rate

How is the hydraulic jump used in fluid mechanics?
a) To measure fluid flow rate
b) To calculate fluid density
c) To analyze fluid pressure distribution
d) To dissipate excess energy in open channel flow

d) To dissipate excess energy in open channel flow

What is the purpose of a flow visualization technique in fluid mechanics?
a) Measuring fluid flow rate
b) Determining fluid viscosity
c) Analyzing fluid pressure distribution
d) Observing fluid flow patterns

d) Observing fluid flow patterns

What is the application of a turbine flow meter in fluid mechanics?
a) Measuring fluid flow rate
b) Analyzing fluid pressure distribution
c) Determining fluid viscosity
d) Calculating fluid density

a) Measuring fluid flow rate

How is the momentum equation used in fluid mechanics?
a) To calculate fluid viscosity
b) To determine laminar or turbulent flow
c) To analyze fluid pressure distribution
d) To measure fluid flow rate

c) To analyze fluid pressure distribution

What is the purpose of a flow nozzle in fluid mechanics?
a) Measuring fluid flow rate
b) Analyzing fluid pressure distribution
c) Determining fluid viscosity
d) Calculating fluid density

a) Measuring fluid flow rate

How is the Joukowsky equation used in fluid mechanics?
a) To measure fluid flow rate
b) To calculate fluid density
c) To analyze fluid pressure distribution
d) To determine the flow around airfoils

d) To determine the flow around airfoils

What is the application of a flow restrictor in fluid mechanics?
a) Measuring fluid flow rate
b) Analyzing fluid pressure distribution
c) Determining fluid viscosity
d) Controlling fluid flow rate

d) Controlling fluid flow rate

What is the purpose of a boundary layer in fluid mechanics?
a) Measuring fluid flow rate
b) Determining fluid viscosity
c) Analyzing fluid pressure distribution
d) Separating the fluid flow from a solid surface

d) Separating the fluid flow from a solid surface

What is the application of a nozzle in fluid mechanics?
a) Measuring fluid flow rate
b) Analyzing fluid pressure distribution
c) Determining fluid viscosity
d) Accelerating fluid flow

d) Accelerating fluid flow

How is the Bernoulli’s equation used in fluid mechanics?
a) To measure fluid flow rate
b) To calculate fluid density
c) To analyze fluid pressure distribution
d) To determine the relationship between fluid velocity and pressure

d) To determine the relationship between fluid velocity and pressure

What is the purpose of a flow control valve in fluid mechanics?
a) Measuring fluid flow rate
b) Analyzing fluid pressure distribution
c) Determining fluid viscosity
d) Controlling fluid flow rate

d) Controlling fluid flow rate

What is the application of a rotameter in fluid mechanics?
a) Measuring fluid flow rate
b) Determining fluid viscosity
c) Analyzing fluid pressure distribution
d) Calculating fluid density

a) Measuring fluid flow rate

How is the Reynolds number used in fluid mechanics?
a) To determine laminar or turbulent flow
b) To calculate fluid viscosity
c) To analyze fluid pressure distribution
d) To measure fluid flow rate

a) To determine laminar or turbulent flow

What is the purpose of a vortex flow meter in fluid mechanics?
a) Measuring fluid flow rate
b) Analyzing fluid pressure distribution
c) Determining fluid viscosity
d) Calculating fluid density

a) Measuring fluid flow rate

How is the hydraulic gradient used in fluid mechanics?
a) To measure fluid flow rate
b) To calculate fluid density
c) To analyze fluid pressure distribution
d) To determine the direction and magnitude of flow in a pipe

d) To determine the direction and magnitude of flow in a pipe

What is the application of a hydraulic jump in fluid mechanics?
a) Measuring fluid flow rate
b) Analyzing fluid pressure distribution
c) Determining fluid viscosity
d) Studying changes in flow behavior

d) Studying changes in flow behavior

What is the purpose of a flow straightener in fluid mechanics?
a) Measuring fluid flow rate
b) Analyzing fluid pressure distribution
c) Determining fluid viscosity
d) Ensuring laminar flow conditions

d) Ensuring laminar flow conditions

What is the application of a flow restrictor in fluid mechanics?
a) Measuring fluid flow rate
b) Analyzing fluid pressure distribution
c) Determining fluid viscosity
d) Controlling fluid flow rate

d) Controlling fluid flow rate

How is the hydraulic radius used in fluid mechanics?
a) To measure fluid flow rate
b) To calculate fluid density
c) To analyze fluid pressure distribution
d) To determine the resistance to flow in a channel