365 + Mcqs in Hydraulics And Fluid Mechanics in Civil Engineering Page 2 McqOptions

51.	A flow in which the quantity of liquid flowing per second is not constant, is called
A.	streamline flow
B.	turbulent flow
C.	steady flow
D.	unsteady flow
Answer» E.

Discussion

52.	A flow in which each liquid particle does not have a definite path and the paths of individual particles also cross each other, is called turbulent flow.
A.	Agree
B.	Disagree
Answer» B. Disagree

Discussion

53.	If an incompressible liquid is continuously flowing through a pipe, the quantity of liquid passing per second is different at different sections.
A.	True
B.	False
Answer» C.

Discussion

54.	The metacentric height of a ship is 0.6 m and the radius of gyration is 4 m. The time of rolling of a ship is
A.	4.1 s
B.	5.2 s
C.	10.4 s
D.	14.1 s
Answer» D. 14.1 s

Discussion

55.	The quantity of a liquid flowing per second through a section of a pipe or a channel is called discharge and is measured in cumecs (m3/s).
A.	True
B.	False
Answer» B. False

Discussion

56.	A body floating in a liquid is said to be not in equilibrium if its metacentre lies below its centre of gravity.
A.	Agree
B.	Disagree
Answer» B. Disagree

Discussion

57.	A body floating in a liquid is said to be in a stable equilibrium, if its metacentre coincides with its centre of gravity.
A.	True
B.	False
Answer» C.

Discussion

58.	If a body floating in a liquid does not return back to its original position, and heels farther "away when given a small angular displacement, the body is said to be in neutral equilibrium.
A.	Yes
B.	No
Answer» C.

Discussion

59.	The line of action of the force of buoyancy acts through the centre of gravity of the volume of the liquid displaced.
A.	True
B.	False
Answer» B. False

Discussion

60.	The tendency of a liquid to uplift a submerged body, because of the upward thrust of the liquid, is known as buoyancy.
A.	Agree
B.	Disagree
Answer» B. Disagree

Discussion

61.	In a lockgate, the reaction between two gates is (where P = Resultant pressure on the lock gate, and α = Inclination of the gate with the normal to the side of the lock)
A.	[A].
B.	[B].
C.	P / 2sinα
D.	[D].
Answer» D. [D].

Discussion

62.	When a body is placed over a liquid, it is subjected to gravitational force and upthrust of the liquid.
A.	True
B.	False
Answer» B. False

Discussion

63.	The depth of centre of pressure lor an immersed surface inclined at an angle θ with the liquid surface lies at a distance equal to __________ the centre of gravity.
A.	below
B.	above
C.	below
D.	above
Answer» B. above

Discussion

64.	A manometer can be used to measure vacuum pressures.
A.	Agree
B.	disagree
Answer» B. disagree

Discussion

65.	The vacuum pressure can be measured with the help of a piezometer tube.
A.	True
B.	False
Answer» C.

Discussion

66.	The vacuum pressure is always the negative gauge pressure.
A.	Yes
B.	No
Answer» B. No

Discussion

67.	When the pressure intensity at a point is less than the local atmospheric pressure, then the difference of these two pressures is called vacuum pressure.
A.	Agree
B.	Disagree
Answer» B. Disagree

Discussion

68.	The density of air is same at different heights.
A.	Correct.
B.	Incorrect
Answer» C.

Discussion

69.	Water is __________ liquid.
A.	a compressible
B.	an incompressible
Answer» C.

Discussion

70.	According to Pascal's law, the intensity of pressure at any point in a fluid at rest is the same in all directions.
A.	Agree
B.	Disagree
Answer» B. Disagree

Discussion

71.	The viscosity of a liquid is due to cohesion of its particles.
A.	Correct
B.	Incorrect
Answer» B. Incorrect

Discussion

72.	In the manufacturing of lead shots, the property of surface tension is utilised.
A.	Agree
B.	Disagree
Answer» B. Disagree

Discussion

73.	The property of a liquid which enables it to resist tensile stress is called its surface tension.
A.	Agree
B.	Disagree
Answer» B. Disagree

Discussion

74.	Kinematic viscosity is the product of dynamic viscosity and the density of the liquid.
A.	Yes
B.	No
Answer» C.

Discussion

75.	A vessel of 4 m3 contains an oil which weighs 30 kN. The specific weight of the oil is
A.	4.5 kN/m3
B.	6 kN/m3
C.	7.5 kN/m3
D.	10 kN/m3
Answer» D. 10 kN/m3

Discussion

76.	The specific weight is also known as weight density.
A.	Correct
B.	Incorrect
Answer» B. Incorrect

Discussion

77.	The density of a liquid in kg/m3 is numerically equal to its specific gravity.
A.	True
B.	False
Answer» B. False

Discussion

78.	The specific gravity has no units.
A.	Agree
B.	Disagree
Answer» B. Disagree

Discussion

79.	The volume per unit mass of a liquid is called specific volume.
A.	Yes
B.	No
Answer» B. No

Discussion

80.	The reciprocal of Euler's number is called Newton number.
A.	Yes
B.	No
Answer» B. No

Discussion

81.	The ratio of the inertia force to the surface tension force is called Weber's number.
A.	Correct
B.	Incorrect
Answer» B. Incorrect

Discussion

82.	The ratio of the inertia force to the gravity force is called Froude number.
A.	Agree
B.	Disagree
Answer» B. Disagree

Discussion

83.	Surface tension force is the product of surface tension per unit length and cross-sectional area of flow.
A.	Correct
B.	Incorrect
Answer» C.

Discussion

84.	Viscous force is the __________ of shear stress due to viscosity and cross-sectionar area of flow.
A.	sum
B.	different
C.	product
D.	ratio
Answer» D. ratio

Discussion

85.	The product of mass and accelaration of flowing liquid is called
A.	inertia force
B.	viscous force
C.	gravity force
D.	pressure force
Answer» B. viscous force

Discussion

86.	The separation of flow occurs when the hydrodynamic boundary layer thickness is reduced to zero.
A.	Agree
B.	Disagree
Answer» B. Disagree

Discussion

87.	Whenever a plate is held immersed at some angle with the direction of flow of the liquid, it is subjected to some pressure. The component of this pressure, at right angles to the direction of flow of the liquid is known as lift.
A.	True
B.	False
Answer» B. False

Discussion

88.	The pressure at a stagnation point is always low.
A.	Agree
B.	Disagree
Answer» C.

Discussion

89.	A flow is called sonic, if the Mach number is unity.
A.	Agree
B.	Disagree
Answer» B. Disagree

Discussion

90.	When the Mach number is equal to unity, the flow is called sonic flow.
A.	True
B.	False
Answer» B. False

Discussion

91.	The ratio of velocity of fluid in an undisturbed stream to the velocity of sound wave is known as Mach number.
A.	Yes
B.	No
Answer» B. No

Discussion

92.	The specific weight of compressible fluids does not remain constant.
A.	True
B.	False
Answer» B. False

Discussion

93.	The torque required to overcome viscous resistance of a collar bearing is (where R1 and R2 = External and internal radius of collar)
A.	[A].
B.	[B].
C.	[C].
D.	[D].
Answer» E.

Discussion

94.	A closed tank is completely filled with an oil. If it is made to move with a horizontal acceleration, then the pressure at the back end will be more than that at the front end.
A.	Correct
B.	Incorrect
Answer» B. Incorrect

Discussion

95.	The D-Alembert's principle is used for changing the dynamic equilibrium of a fluid mass, into a static equilibrium.
A.	Agree
B.	Disagree
Answer» B. Disagree

Discussion

96.	A moving fluid mass may be brought to a static equilibrium position, by aplying an imaginary inertia force of the same magnitude as that of the accelerating force but in the opposite direction. This statement is called
A.	Pascal's law
B.	Archimede's principle
C.	D-Alembert's principle
D.	none of these
Answer» D. none of these

Discussion

97.	The flow in a pipe is laminar, when Reynold number is less than 2000.
A.	True
B.	False
Answer» B. False

Discussion

98.	The velocity at which the turbulent flow starts is known as higher critical velocity.
A.	Yes
B.	No
Answer» B. No

Discussion

99.	Laminar flow __________ place at very low velocities.
A.	takes
B.	does not take
Answer» B. does not take

Discussion

100.	Turbulent flow takes place at high velocities.
A.	Agree
B.	Disagree
Answer» B. Disagree

Discussion

Explore topic-wise MCQs in Civil Engineering.

A flow in which the quantity of liquid flowing per second is not constant, is called

A flow in which each liquid particle does not have a definite path and the paths of individual particles also cross each other, is called turbulent flow.

If an incompressible liquid is continuously flowing through a pipe, the quantity of liquid passing per second is different at different sections.

The metacentric height of a ship is 0.6 m and the radius of gyration is 4 m. The time of rolling of a ship is

The quantity of a liquid flowing per second through a section of a pipe or a channel is called discharge and is measured in cumecs (m3/s).

A body floating in a liquid is said to be not in equilibrium if its metacentre lies below its centre of gravity.

A body floating in a liquid is said to be in a stable equilibrium, if its metacentre coincides with its centre of gravity.

If a body floating in a liquid does not return back to its original position, and heels farther "away when given a small angular displacement, the body is said to be in neutral equilibrium.

The line of action of the force of buoyancy acts through the centre of gravity of the volume of the liquid displaced.

The tendency of a liquid to uplift a submerged body, because of the upward thrust of the liquid, is known as buoyancy.

In a lockgate, the reaction between two gates is (where P = Resultant pressure on the lock gate, and α = Inclination of the gate with the normal to the side of the lock)

When a body is placed over a liquid, it is subjected to gravitational force and upthrust of the liquid.

The depth of centre of pressure lor an immersed surface inclined at an angle θ with the liquid surface lies at a distance equal to __________ the centre of gravity.

A manometer can be used to measure vacuum pressures.

The vacuum pressure can be measured with the help of a piezometer tube.

The vacuum pressure is always the negative gauge pressure.

When the pressure intensity at a point is less than the local atmospheric pressure, then the difference of these two pressures is called vacuum pressure.

The density of air is same at different heights.

Water is __________ liquid.

According to Pascal's law, the intensity of pressure at any point in a fluid at rest is the same in all directions.

The viscosity of a liquid is due to cohesion of its particles.

In the manufacturing of lead shots, the property of surface tension is utilised.

The property of a liquid which enables it to resist tensile stress is called its surface tension.

Kinematic viscosity is the product of dynamic viscosity and the density of the liquid.

A vessel of 4 m3 contains an oil which weighs 30 kN. The specific weight of the oil is

The specific weight is also known as weight density.

The density of a liquid in kg/m3 is numerically equal to its specific gravity.

The specific gravity has no units.

The volume per unit mass of a liquid is called specific volume.

The reciprocal of Euler's number is called Newton number.

The ratio of the inertia force to the surface tension force is called Weber's number.

The ratio of the inertia force to the gravity force is called Froude number.

Surface tension force is the product of surface tension per unit length and cross-sectional area of flow.

Viscous force is the __________ of shear stress due to viscosity and cross-sectionar area of flow.

The product of mass and accelaration of flowing liquid is called

The separation of flow occurs when the hydrodynamic boundary layer thickness is reduced to zero.

Whenever a plate is held immersed at some angle with the direction of flow of the liquid, it is subjected to some pressure. The component of this pressure, at right angles to the direction of flow of the liquid is known as lift.

The pressure at a stagnation point is always low.

A flow is called sonic, if the Mach number is unity.

When the Mach number is equal to unity, the flow is called sonic flow.

The ratio of velocity of fluid in an undisturbed stream to the velocity of sound wave is known as Mach number.

The specific weight of compressible fluids does not remain constant.

The torque required to overcome viscous resistance of a collar bearing is (where R1 and R2 = External and internal radius of collar)

A closed tank is completely filled with an oil. If it is made to move with a horizontal acceleration, then the pressure at the back end will be more than that at the front end.

The D-Alembert's principle is used for changing the dynamic equilibrium of a fluid mass, into a static equilibrium.

A moving fluid mass may be brought to a static equilibrium position, by aplying an imaginary inertia force of the same magnitude as that of the accelerating force but in the opposite direction. This statement is called

The flow in a pipe is laminar, when Reynold number is less than 2000.

The velocity at which the turbulent flow starts is known as higher critical velocity.

Laminar flow __________ place at very low velocities.

Turbulent flow takes place at high velocities.