Here are 1000 Fluid Mechanics MCQ (Chapterwise).
1. What is fluid mechanics?
a) Study of fluid behaviour at rest
b) Study of fluid behaviour in motion
c) Study of fluid behaviour at rest and in motion
d) Study of fluid behaviour at rest and in motion
View Answer
Explanation: The study of fluid behaviour (liquids, gases, blood, and plasmas) at rest and in motion is known as fluid mechanics. Fluid mechanics has numerous applications in mechanical and chemical engineering, as well as biological and astrophysical systems.
2. Which of the following is the basic principle of fluid mechanics?
a) Momentum principle
b) Energy equation
c) Continuity equation
d) All of the mentioned
View Answer
Explanation: The continuity equation (i.e. mass conservation), the momentum principle (or momentum conservation), and the energy equation are the three basic fluid mechanics principles.
3. What is fluid mechanics used for?
a) Fluid mechanics enables to comprehend the behaviour of solid fluids under pressure
b) Fluid mechanics enables to comprehend the behaviour of fluids under a variety of forces & atmospheric conditions
c) Fluid mechanics enables to comprehend the behaviour of fluids under various temperatures only
d) None of the mentioned
View Answer
Explanation: Fluid mechanics enables to comprehend the behaviour of fluids under a variety of forces and atmospheric conditions, as well as to select the appropriate fluid for a variety of applications.
4. If a person studies about a fluid which is at rest, what will you call his domain of study?
a) Fluid Dynamics
b) Fluid Mechanics
c) Fluid Statics
d) Fluid Kinematics
View Answer
Explanation: Fluid Mechanics deals with the study of fluid at rest or in motion with or without the consideration of forces, Fluid Statics is the study of fluid at rest, Fluid Kinematics is the study of fluid in motion without consideration of forces and Fluid Dynamics is the study of fluid in motion considering the application forces.
5. Which among the following is the standard symbol for Atwood number?
a) Ar
b) A
c) a
d) AR
View Answer
Explanation: The standard symbol for Atwood number is A. Atwood’s number in fluid mechanics deals with the onset of instabilities in mixtures of fluid. It is due to the density differences in fluid.
6. Which of the following method is used exclusively in fluid mechanics?
a) Eulerian method
b) Lagrangian method
c) Neither Lagrangian nor Eulerian method
d) Both Lagrangian and Eulerian methods
View Answer
Explanation: In Fluid Mechanics, the matter of concern is the general state of motion at various points in the fluid system (as in Eulerian approach) rather than the motion of each particle (as in Lagrangian approach). Hence, the Eulerian method is extensively used in Fluid Mechanics.
7. Which of the following method is most commonly used in fluid mechanics for analysis?
a) Eulerian Method
b) Control volume analysis
c) Langragian method
d) None of the mentioned
View Answer
Explanation: In Eulerian method,we describe velocity, acceleration pressure etc at a point in flow field.hence, it is also most commonly used in fluid mechanics.
8. When is a fluid called turbulent?
a) High viscosity of fluid
b) Reynolds number is greater than 2000
c) Reynolds number is less than 2000
d) The density of the fluid is low
View Answer
Explanation: Reynolds number is a dimensionless quantity. It helps to predict the flow pattern in fluid mechanics. At high Reynolds number, the flow has a very high density, due to which the value of Reynolds number is greater than 2000.
9. Which among the following is the standard symbol for Blake number?
a) ba
b) b
c) Bi
d) Bl
View Answer
Explanation: The standard symbol for Blake number is B or Bl. Blake number in fluid mechanics deals with geology, fluid mechanics and porous media. It is due to the inertial over the viscous forces in fluid flow through porous media.
10. Stagnation point is the point in fluid mechanics where the velocity of the fluid at that point is _____
a) unity
b) constant
c) infinite
d) zero
View Answer
Explanation: Stagnation point is the point in fluid mechanics where the velocity of the fluid at that point is zero. Stagnation points occur at places where the fluid is brought to a state of rest by an object. They usually exist at the surface of objects.
11. Which among the following is the standard symbol for Archimedes number?
a) Ar
b) A
c) a
d) AR
View Answer
Explanation: The standard symbol for Archimedes number is Ar. Archimedes number in fluid mechanics deals with the motion of fluids. This takes place due to the differences in their densities. It was followed by the Archimedes principle.
12. Which among the following is referred to as the temperature at a stagnation point in the flow of fluids in fluid mechanics and thermodynamics.
a) Absolute temperature
b) Maximum temperature
c) Stagnation temperature
d) Hydraulic temperature
View Answer
Explanation: Stagnation temperature is the temperature at the stagnation point of the flow of fluids. In thermodynamics and fluid mechanics, these terms find application. At a stagnation point the speed of the fluid is zero and all of the kinetic energy has been converted to internal energy and is added to the local static enthalpy.
13. What is model testing?
a) Overall testing
b) Function testing
c) Partial testing
d) Performance testing
View Answer
Explanation: The process in fluid mechanics that is used to study the complex fluid dynamics is called as model testing. It is a performance testing. It helps to test models after a standard scaling. Models are usually smaller than the final design.
14. When is the fluid called laminar?
a) Low viscosity
b) The density of the fluid is high
c) Reynolds number is greater than 2000
d) Reynolds number is less than 2000
View Answer
Explanation: Reynolds number is a dimensionless quantity. It helps to predict the flow pattern in fluid mechanics. At low Reynolds number, the flow has a very low density, due to which the value of Reynolds number is less than 2000.
15. Which among the following provides the third principle in fluid mechanics?
a) Conservation of Heat
b) Conservation of volume
c) Conservation of linear momentum
d) Conservation of mass
View Answer
Explanation: In fluid mechanics, the third principle is given by the conservation of linear momentum. It is in addition to the continuity of mass and conservation of energy. They are mostly seen in channel flow problems.
16. When a fluid is subjected to resistance, it undergoes a volumetric change due to __________
a) Cohesion
b) Strain
c) Compressibility
d) Adhesion
View Answer
Explanation: Compressibility is defined as a measure of relative change in volume of a fluid. In fluid mechanics, it is also called as isothermal compressibility due to increase in pressure and temperature.
17. The compressible flow is assumed to be _____________
a) Adiabatic only
b) Isentropic only
c) Isentropic and adiabatic
d) Polytropic
View Answer
Explanation: Compressible flow is a branch of fluid mechanics that deals with different types of flow. Its main significance lies in the change in fluid density. It deals with gas dynamics. Flow is assumed to be isentropic.
18. Principle of fluid mechanics works on the utilization of________
a) Velocity
b) Accelerating mass
c) Volume
d) Work
View Answer
Explanation: The Principle of fluid mechanics works on the utilization of useful work. The working is based on the force exerted by a fluid jet striking the surface and moving over a series of vanes about its axis.
19. Open channel flow takes place _______
a) In a pump
b) Within a cylindrical depth
c) On a free surface
d) In the pipe
View Answer
Explanation: Open channel flow is a flow that deals with hydraulics in fluid mechanics. It is a type of liquid flow that flows through a free surface. This free surface is called as a channel. And since the channel is free, it is called as an open channel flow.
20. Which of the following is a type of fluid based on viscosity?
a) Real Fluid
b) Ideal Fluid
c) Newtonian Fluid
d) All of the mentioned
View Answer
Explanation: Fluid based on viscosity:
i) Real Fluid
ii) Ideal Fluid
iii) Newtonian Fluid
iv) Non-Newtonian Fluid
v) Ideal Plastic Fluid
21. The viscous force the relative motion between the adjacent layers of a fluid in motion. Which of the following flowing fits best in the sentence?
a) never affects
b) may effect under certain conditions
c) facilitates
d) opposes
View Answer
Explanation: Viscosity is the internal friction of a fluid in motion. It is the property by the virtue of which the relative motion between two adjacent fluid layers is opposed.
22. Pressure intensity or force due to pressure gradient for fluid at rest is considered as which of the following kind of force?
a) Body force
b) Force due to motion
c) Surface force
d) None of the mentioned
View Answer
Explanation: Pressure force is surface force.
23. Pressure variation for compressible fluid is maximum for which of the following kind of process?
a) Adiabatic
b) Quasi Static
c) Isothermal
d) None of the mentioned
View Answer
Explanation: Due to constant temperature, pressure variation for compressible fluid is maximum for isothermal process.
24. Which of the following principle is used for calculating the centre of pressure?
a) Principle of balancing of momentum
b) Principle of momentum
c) Principle of conservation of energy
d) None of the mentioned
View Answer
Explanation: We balance the moment in order to calculate the position of centre of pressure.
25. Which of the following cannot be the value of absolute pressure of a fluid at any point?
a) 0
b) 1.45 bar
c) – 1 bar
d) 24 bar
View Answer
Explanation: Absolute zero pressure is the reference used for the measurement of absolute pressure. Absolute zero pressure is possible (theoretically). Hence, 0 and positive values are possible, but a negative value is impossible.
26. When the body is completely or partially immersed in a fluid, how much its weight be distributed for it to be in stable equilibrium.
a) Is independent of weight distribution
b) Around the lower part
c) Around the upper part
d) None of the mentioned
View Answer
Explanation: When the weight distribution is around the lower part, the centre of gravity is at lower portion and hence below the centre of buoyancy which is condition for stable equilibrium.
27. Which of the following equation must be perfunctorily satisfied while dealing with fluid flow problems?
a) Newton’s third law
b) Law of conservation of momentum
c) Continuity equation
d) Newton’s second law
View Answer
Explanation: Continuity equation must be perfunctorily satisfied while dealing with fluid flow problems.
29. Which among the following is an assumption of Hagen-Poiseuille equation?
a) Fluid is uniform
b) Fluid is laminar
c) Fluid is turbulent
d) Fluid is compressible
View Answer
Explanation: Fluid flow is laminar as it is assumed to be incompressible and Newtonian. The flow is laminar through the pipe of constant cross section. Thus, there is no acceleration of fluid in the pipe. Therefore, Hagen-Poiseuille assumed that fluid flow is laminar.
30. Which of the following is a formula for the friction factor of circular pipes?
a) Re/64
b) 16/Re
c) 64/Re
d) Re/16
View Answer
Explanation: Circular pipes have a diameter treated in a round manner. For a fluid flow which is laminar head loss is directly proportional to the fluid velocity. Thus, friction factor is inversely proportional to its velocity. Therefore, the correct option is ‘64/Re’.
31. Which among the following is not global parameters of fluid?
a) Mass flow rate
b) Density
c) Viscosity
d) External diameter
View Answer
Explanation: External diameter is not a global parameter. It is one of the most essential pipelining parameters. It helps in determining the type of pipe and material to be used for the same.
32. Which of the following is the mathematical technique used to predict physical parameters?
a) Dimensional analysis
b) Temperature analysis
c) Pressure analysis
d) Combustion analysis
View Answer
Explanation: Dimensional analysis is a process which is used to determine physical parameters that influence the fluid flow. The analysis is based on the fundamental units. The fundamental units are mass, length and time.
33. Which among the following have the same forces acting on them?
a) Dynamic similarity
b) Geometric similarity
c) Conditional similarity
d) Kinematic similarity
View Answer
Explanation: Dynamic similarities have the same forces acting on them. That means, the ratios of all the forces acting on the fluid particles are constant. Also, the ratio of the forces acting on the boundary surfaces are also a constant.
Chapterwise Multiple Choice Questions on Fluid Mechanics
- Properties of Fluids
- Pressure and Its Measurement
- Hydrostatic Forces on Surfaces
- Buoyancy and Floatation
- Kinematics of Flow and Ideal Flow
- Fluid Dynamics
- Orifices, Mouthpieces, Notches and Weirs
- Viscous Flow & Turbulent Flow
- Flow Through Pipes
- Indicator Diagrams
- Dimensional and Model Analysis
- Boundary Layer Flow & Forces on Sub-merged Bodies
- Compressible Flow
- Flow in Open Channels
- Non Uniform Flow in Channels
- Impact of Jets and Jet Propulsion
1. Fluid Mechanics MCQ on Properties of Fluids
The section contains multiple choice questions and answers on fluid mechanics basics and properties, viscosity, vapor pressure, compressibility and bulk modulus, fluids types, surface tension, capillarity and thermodynamic properties.
2. Fluid Mechanics Multiple Choice Questions on Pressure and Its Measurement
The section contains Fluid Mechanics questions and answers on pressure distribution in fluid, pressure measurement, pascals law and compression fluid pressure point.
3. Fluid Mechanics MCQ on Hydrostatic Forces on Surfaces
The section contains Fluid Mechanics MCQs on hydrostatic force on plane area, pressure distribution in liquid, horizantal and inclined plane in liquid, total pressure and vertical plane surface.
4. Fluid Mechanics Multiple Choice Questions on Buoyancy and Floatation
The section contains Fluid Mechanics multiple choice questions and answers on buoyancy, metacenter and metacentric height, manometer and equilibrium conditions of submerged bodies.
|
|
5. Fluid Mechanics MCQ on Kinematics of Flow and Ideal Flow
The section contains Fluid Mechanics questions and answers on fluid flow types and methods, continuity equation & its dimensions, flow lines types, velocity and acceleration, vortex flow, important cases of potential and super imposed flow.
6. Multiple Choice Questions on Fluid Dynamics
The section contains Fluid Mechanics MCQs on euler and bernoulli equations of motion, bernoulli applications, newtons first and second law, navier strokes equation, impulse and moment of momentum equation.
7. Fluid Mechanics MCQ on Orifices, Mouthpieces, Notches and Weirs
The section contains Fluid Mechanics multiple choice questions and answers on orifice, notches and weirs classification, large orifice flows, discharge over notches or weirs, time required to empty reservoir with notches and weirs.
8. Fluid Mechanics Multiple Choice Questions on Viscous Flow & Turbulent Flow
The section contains Fluid Mechanics questions and answers on shear stress in viscous and turbulent flow, piston movement, flow of viscous fluid through circular pipes, power absorption, universal velocity distribution and viscosity coefficient methods.
9. Fluid Mechanics MCQ on Flow Through Pipes
The section contains Fluid Mechanics MCQs on energy losses in pipes, hydraulic gradient, series and parallel pipes, nozzles flow, pipes water hammer and pipe network.
|
|
10. Fluid Mechanics Multiple Choice Questions on Indicator Diagrams
The section contains Fluid Mechanics multiple choice questions and answers on ideal indicator diagram, reciprocating pump maximum speed, acceleration effect in suction and delivery pipes on indicator diagrams.
|
|
11. Fluid Mechanics MCQ on Dimensional and Model Analysis
The section contains Fluid Mechanics questions and answers on dimensional homogenity, model analysis, dimensionless numbers, similarities types and laws, testing on submerged bodies, moving fluid types and model classifications.
|
|
12. Fluid Mechanics Multiple Choice Questions on Boundary Layer Flow & Forces on Sub-merged Bodies
The section contains Fluid Mechanics MCQs on sphere drag, turbulent boundary layer on flat plate and boundary layer separation.
|
|
13. Fluid Mechanics MCQ on Compressible Flow
The section contains Fluid Mechanics multiple choice questions and answers on thermodynamic relations, compressible flow equations, sound or pressure wave velocity in fluid, stagnation properties, compressible fluid through orifices and nozzles.
14. Fluid Mechanics Multiple Choice Questions on Flow in Open Channels
The section contains Fluid Mechanics questions and answers on channel flow types, chezys formula, geometrical properties of rectangular section, triangular and trapezoidal section, manning’s equation, most economic rectangular section, trapezoidal and circular section, specific energy and different channel sections.
15. Fluid Mechanics MCQ on Non Uniform Flow in Channels
The section contains Fluid Mechanics MCQs on gradually varied flow, gradually varied flow in wide rectangular channels, surface profiles characteristics, relation b/w water surface and channel bottom slopes, hydraulic jump, hydraulic jump types and location.
16. Fluid Mechanics Multiple Choice Questions on Impact of Jets and Jet Propulsion
The section contains Fluid Mechanics multiple choice questions and answers on exerted force by a jet on a vanes series, exerted force by a fluid jet in stationary flat inclined and curved plate.
|
|
Wish you the best in your endeavor to learn and master Fluid Mechanics!