Fluid Mechanics MCQs - Objective Type Questions and Answers

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Select Topic Elementary Fluid Dynamics Fluid Kinematics Fluid Mechanics Fluid Statistics

Elementary Fluid Dynamics 

MCQ 1: the sum of the pressure head and the elevation head is called
A. Energy head
B. hydraulic head
C. piezo metric head
D. All of above
MCQ 2: If the flow is steady, incompressible, and in viscid, the energy line is
A. horizontal
B. vertical
C. angular
D. perpendicular
MCQ 3: Stagnation pressure is also called
A. field pressure
B. pitot pressure
C. surface pressure
D. object pressure
MCQ 4: As the diameter of pipe changes, elevation of hydraulic line
A. remains same
B. changes
C. remains constant
D. None of these
MCQ 5: A line that represents the total head available to the fluid is called
A. fluid line
B. Energy line
C. head line
D. None of these
MCQ 6: The Bernoulli equation cannot be applied across streamlines if the flow is
A. Linear
B. Laminar
C. Rotational
D. None of these
MCQ 7: At stagnation point, all the kinetic energy is converted into
A. velocity
B. pressure
C. speed
D. None of these
MCQ 8: The sum of pressure, elevation, and velocity effects is
A. changing across streamlines
B. constant across streamlines.
C. not constant across streamlines.
D. None of these
MCQ 9: Free Jet equation is
A. v = √2gh
B. v = √2/gh
C. v = 1/√2gh
D. v = √2g
MCQ 10: A1V1 = A2V2, this equation is called
A. continuity equation
B. Bernoulli's equation
C. volume equation
D. area equation
MCQ 11: The pressure variation across straight streamlines is
A. hydrostatic
B. not hydrostatic
C. static
D. None of these
MCQ 12: Under the assumptions of the Bernoulli equation, the energy line is
A. horizontal
B. vertical
C. angular
D. perpendicular
MCQ 13: At a stagnation point the fluid velocity is
A. maximum
B. minimum
C. unity
D. zero
MCQ 14: For small Mach numbers, the compressible and incompressible results
are
A. different
B. inverse of each other
C. nearly same
D. None of these
MCQ 15: The Pitot-static tube is used to measure
A. fluid density
B. fluid speed
C. fluid viscosity
D. fluid friction
MCQ 16: In vena contracta effect, the diameter of jet is
A. greater than diameter of hole
B. lesser than diameter of hole
C. equal to diameter of hole
D. two times the diameter of hole
MCQ 17: For flow below the hydraulic grade line, the pressure is
A. positive
B. negative
C. zero
D. None of these
MCQ 18: Cavitation occurs when the pressure is reduced to the
A. vapor pressure
B. melting pressure
C. cooling pressure
D. None of these
MCQ 19: If Aj is area of jet at vena contracta and Ao is area of hole, contraction co-
efficient Cc is equal to
A. Aj/Ao
B. Aj x Ao
C. Ao/Aj
D. 1/AjAo
MCQ 20: The kinetic energy per unit volume of a fluid particle is called
A. stagnation pressure
B. dynamic pressure
C. surface pressure
D. field pressure
MCQ 21: The flow rate varies across the flow meter as
A. square root of the pressure difference
B. integral of the pressure difference
C. derivative of the pressure difference
D. log of the pressure difference
MCQ 22: The distance from the pipe to the hydraulic grade line indicates the
A. pressure at exit of pipe
B. pressure at inlet of pipe
C. pressure within the pipe
D. None of these
MCQ 23: The unit of mass flow rate is
A. slugs/s
B. kg/s
C. Both A and B
D. None of these
MCQ 24: The exit pressure for an incompressible fluid jet is equal to the
A. surrounding pressure
B. inlet pressure
C. total pressure
D. None of these
MCQ 25: In the flow field, the point exist at the surface of object where fluid is
brought to rest by object is called
A. field point
B. surface point
C. stagnation point
D. object point
MCQ 26: The net pressure force on a particle is determined by
A. pressure gradient
B. total pressure
C. pressure curve
D. None of these
MCQ 27: If the fluid velocity changes along the streamline, the hydraulic grade line
will
A. be horizontal
B. not be horizontal
C. be integral of velocity
D. None of these
MCQ 28: The hydraulic grade line and energy line are
A. graphical forms of the Bernoulli equation.
B. theoretical forms of the Bernoulli equation.
C. integral forms of the Bernoulli equation.
D. None of these
MCQ 29: The unit of volume flow rate is
A. m^2/s^2
B. m^3/s
C. m^3/s^2
D. m^2/s
MCQ 30: At stagnation point, static pressure is at its
A. maximum value
B. minimum value
C. medium value
D. None of these
MCQ 31: Pitot-static tubes measure fluid velocity by converting velocity into
A. potential energy
B. Kinetic energy
C. pressure
D. None of these
MCQ 32: The hydraulic grade line lies a distance of one velocity head,
A. below the energy line
B. above the energy line
C. coincides the energy line
D. None of these
MCQ 33: The point of minimum area in jet of flow is called
A. jet point
B. vena contracta
C. expansion point
D. None of these
MCQ 34: For flow above the hydraulic grade line, the pressure is
A. positive
B. negative
C. zero
D. None of these
MCQ 35: The static pressure at stagnation point in the flow field is called
A. stagnation pressure
B. dynamic pressure
C. surface pressure
D. field pressure
MCQ 36: The lines that are tangent to the velocity vectors throughout the flow field
are called
A. Fluid lines
B. Stream lines
C. tangent lines
D. field lines
MCQ 37: The Bernoulli equation can be written in terms of heights called
A. heads
B. columns
C. lengths
D. None of these
MCQ 38: The sum of the static pressure, hydrostatic pressure, and dynamic pres-
sure is termed as
A. total pressure
B. partial pressure
C. surface pressure
D. field pressure
Answers:
1. C
2. A
3. B
4. B
5. B
6. C
7. B
8. B
9. A
10. A
11. A
12. A
13. D
14. C
15. B
16. B
17. A
18. A
19. A
20. B
21. A
22. C
23. C
24. A
25. C
26. A
27. B
28. A
29. B
30. A
31. C
32. A
33. B
34. B
35. A
36. B
37. A
38. A

Fluid Kinematics 

MCQ 1: Euler equation is useful for
A. viscid flow
B. in viscid flow
C. rotational flow
D. None of these
MCQ 2: The flow in which each particle of fluid follows an irregular path is called
A. laminar flow
B. turbulent flow
C. mixed flow
D. None of these
MCQ 3: The smooth flow of highly viscous syrup onto a pancake represents a
A. deterministic laminar flow
B. turbulent flow
C. sinusoidal flow
D. None of these
MCQ 4: In many ways the relationship between a system and a control volume is
similar to the relationship between the
A. Reynolds and Eulerian flow
B. Lagrangian and Eulerian flow
C. Lagrangian and Reynolds flow
D. None of these
MCQ 5: The flow in which each particle of fluid follows a smooth path is called
A. laminar flow
B. turbulent flow
C. mixed flow
D. None of these
MCQ 6: A line that is everywhere tangent to the velocity field is
A. flow line
B. streamline
C. streak line
D. All of above
MCQ 7: The portion of the material derivative represented by the spatial derivatives
is termed the
A. detective derivative
B. convective derivative
C. erective derivative
D. None of these
MCQ 8: The flow rate of a parameter across the control surface is written in terms
of
A. surface integral
B. control integral
C. flow integral
D. None of these
MCQ 9: Volume in space through which fluid may flow is called
A. control volume
B. control space
C. indicated volume
D. None of these
MCQ 10: The lines obtained by taking instantaneous photographs of marked parti-
cles that all passed through a given location in the flow field at some earlier time
called
A. path line
B. streamline
C. streak line
D. flow line
MCQ 11: For steady flow, streamlines, streak lines, and path lines are
A. same
B. different
C. perpendicular to each other
D. None of these
MCQ 12: The time rate of change of a system property is
A. Reynolds concept
B. Eulerian concept
C. Lagrangian concept
D. All of above
MCQ 13: The line traced out by a given particle as it flows from one point to another
is called
A. path line
B. streamline
C. streak line
D. flow line
MCQ 14: The representation of fluid parameters as functions of the spatial coordi-
nates is termed as
A. spatial representation
B. field representation
C. function representation
D. None of these
MCQ 15: The Reynolds transport theorem is the integral counterpart of the
A. velocity derivative
B. material derivative
C. acceleration derivative
D. All of above
MCQ 16: Laminar flow usually occurs at
A. high speed
B. low speed
C. medium speed
D. zero speed

Answers: 

1. B
2. B
3. A
4. B
5. A
6. B
7. B
8. A
9. A
10. C
11. A
12. C
13. A
14. B
15. B
16. B

Fluid Mechanics 

MCQ 1: The unit of density is
A. kg/m^3
B. slug/m^3
C. Both A and B
D. None of these
MCQ 2:
A. Viscosity
B. Surface tension
C. specific gravity
D. molecular tension
MCQ 3: Newtonian fluid shear stress is equal to
A. T = (du/dy)
B. T = μ (du/dy)
C. T = μ (dy/du)
D. T = 2μ (du/dy)
MCQ 4: The ratio of absolute viscosity to fluid density is called
A. kinematic viscosity
B. dynamic viscosity
C. specific viscosity
D. None of these
MCQ 5: A liquid boils when the pressure is reduced to
A. vapor pressure
B. internal pressure
C. stoke pressure
D. None of these
MCQ 6: The value of gravity in ft/s^2 is
A. 9.8
B. 32.174
C. 64.24
D. 18.8
MCQ 7: Weight per unit volume is called
A. specific volume
B. specific weight
C. specific gravity
D. specific mass
MCQ 8: Dimension of dynamic viscosity is
A. M L^-1 T^-2
B. M L^-2 T^-1
C. M L^-1 T^-1
D. M L^2 T^-1
MCQ 9: The empirical equation used to describe the effect of temperature on vis-
cosity of liquids is
A. Andrade's equation
B. Sutherland equation
C. Jone's equation
D. Poisson's equation
MCQ 10: The reciprocal of density is
A. specific volume
B. specific mass
C. specific density
D. specific viscosity
MCQ 11: The property commonly used to characterize compressibility of fluid is
A. fluid modulus
B. compression modulus
C. bulk modulus
D. None of these
MCQ 12: In the CGS system, unit of kinematic viscosity is
A. poise
B. stoke
C. slug
D. None of these
MCQ 13: Capillary action in small tubes, which involves a liquid
A. Viscosity
B. Surface tension
C. internal pressure
D. molecular tension
MCQ 14: Andrade's equation of viscosity is
A. μ = e^B/T
B. μ = De^B
C. μ = De^B/T
D. μ = De^2B/T
MCQ 15: Speed of sound in an ideal gas is equal to
A. c = √kRT
B. c = √kR/T
C. c = √k/RT
D. c = √2kRT
MCQ 16: The ratio of fluid density to the density of water at a certain temperature is
called
A. specific volume
B. specific weight
C. specific gravity
D. specific mass
MCQ 17: The prefix peco is used for
A. 10^-9
B. 10^-12
C. 10^9
D. 10^15
MCQ 18: Specific weight is equal to
A. γ = ρg
B. γ = ρ/g
C. γ = 2ρg
D. γ = ρ/2g
MCQ 19: The slope of the shearing stress versus rate of shearing strain graph is
A. kinematic viscosity
B. specific viscosity
C. apparent viscosity
D. None of these
MCQ 20: All theoretically derived equations are
A. dimensionally homogenous
B. dimensionally non homogenous
C. dimensionally unstable
D. None of these
MCQ 21: Dimension of kinematic viscosity is
A. L^3 T^-1
B. L^2 T^-1
C. L^2 T^-2
D. ML^2 T^-1
MCQ 22: For non-Newtonian fluids, the apparent viscosity is a function of
A. shear rate
B. flow rate
C. viscous rate
D. specific rate
MCQ 23: Sutherland equation of viscosity is
A. μ = CT^(3/2)/T+S
B. μ = CT^(5/2)/T+S
C. μ = CT^(3/2)/T
D. μ = CT^(3/2)/S
MCQ 24: The empirical equation used to describe the effect of temperature on vis-
cosity of gases is
A. Andrade's equation
B. Sutherland equation
C. Jone's equation
D. Poisson's equation
MCQ 25: Slug is unit of
A. mass
B. density
C. force
D. viscosity

Answers: 

1. C
2. B
3. B
4. A
5. A
6. B
7. B
8. C
9. A
10. A
11. C
12. B
13. B
14. C
15. A
16. C
17. B
18. A
19. C
20. A
21. B
22. A
23. A
24. B
25. A

Fluid Statistics 

MCQ 1: A fluid with constant density is called
A. compressible fluid
B. Incompressible fluid
C. Both A and B
D. None of these
MCQ 2: The device used to measure pressure is called
A. barometer
B. anemometer
C. speedometer
D. thermometer
MCQ 3: The device which involves the use of vertical or inclined liquid columns to
measure pressure is
A. manometer
B. anemometer
C. speedometer
D. thermometer
MCQ 4: The buoyant force has a magnitude equal to the weight of the fluid dis-
placed by the body and is directed vertically upward. This statement is called
A. Archimedes principle
B. Fluid principle
C. buoyancy principle
D. None of these
MCQ 5: A fluid contained in a tank that is rotating with a constant angular velocity
about an axis will rotate as
A. rigid body
B. non rigid body
C. free body
D. None of these
MCQ 6: The pressure gage uses a hollow, elastic, and curved tube to measure pres-
sure is
A. Bourdon tube
B. U-tube manometer
C. sphygmomanometer
D. piezometer tube
MCQ 7: The device that converts the pressure into an electrical output is
A. Bourdon tube
B. U-tube manometer
C. pressure transducer
D. aneroid barometer
MCQ 8: The pressure at a point in a fluid at rest is
A. independent of direction
B. direction dependent
C. motion dependent
D. None of these
MCQ 9: A completely submerged body with its center of gravity above its center of
buoyancy is in
A. stable equilibrium position
B. an unstable equilibrium position
C. forced equilibrium position
D. None of these
MCQ 10: Pressure variation in a stationary incompressible fluid is
A. P1 - P2 = γh
B. P1 - P2 = γ/h
C. P1 - P2 = 2γh
D. P1 - P2 = 1/γh
MCQ 11: When a stationary body is completely submerged in a fluid or floating so
that it is only partially submerged, the resultant fluid force acting on the body is
called
A. Buoyant force
B. pressure force
C. free force
D. floating force
MCQ 12: The device used to measure pressure of blood is
A. barometer
B. U-tube manometer
C. sphygmomanometer
D. None of these
MCQ 13: The free surface in a rotating liquid is
A. Flat
B. parabolic
C. curved
D. irregular
MCQ 14: The device used to measure the difference in pressure between two con-
tainers or two points in a given system is
A. anemometer
B. U-tube manometer
C. sphygmomanometer
D. None of these
MCQ 15: If the center of gravity falls below the center of buoyancy, the body is in
A. stable equilibrium position
B. an unstable equilibrium position
C. forced equilibrium position
D. None of these
MCQ 16: The pressure distribution in a fluid mass that is accelerating along a
straight path is
A. hydrostatic
B. not hydrostatic
C. static
D. None of these
MCQ 17: A negative gauge pressure is referred as
A. suction pressure
B. vacuum pressure
C. absolute pressure
D. Both A and B
MCQ 18: The fluids that move with rigid body motion or with rigid-body rotation
has
A. shear stress
B. no shear stress
C. negative stress
D. None of these
MCQ 19: Pressure gradient in a stationary fluid is
A. dp/dz = γ
B. dp/dz = -γ
C. dp/dz = -1/γ
D. dp/dz = -2γ
MCQ 20: The expression for buoyant force is
A. F = γ/V
B. F = γ/2V
C. F = γV
D. F = 2γV
MCQ 21: Hydrostatic force on a plane surface is
A. F = 1/γhA
B. F = γh/A
C. F = γhA
D. F = γ/hA

Answers: 

1. B
2. A
3. A
4. A
5. A
6. A
7. C
8. A
9. B
10. A
11. A
12. C
13. C
14. B
15. A
16. B
17. D
18. B
19. B
20. C
21. C 

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