160+ Hydraulics Solved MCQs

These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Civil Engineering .

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51.	A rectangular plate of 2 m x 3 m height is immersed in water vertically with top edge parallel to and at depth of 3 m below free surface. Calculate total water pressure.
A.	264.87 kN
B.	264.87 N
C.	176.58 N
D.	176.58 kN
Answer» A. 264.87 kN

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52.	An inverted triangular plate is having base parallel to water surface with width 1.6 m and height 2.10 m. It is submerged in water in such a way that its base is 1.0 m below free surface. Find total pressure.
A.	28.01 N
B.	28.01 kN
C.	16.48 kN
D.	16.48 N
Answer» B. 28.01 kN

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53.	A circular plate 2.5 m diameter is immersed in water with its greatest and lowest depth below the free surface being 3.0m and 1.0m respectively. Find the position of centre of pressure
A.	2.125 m
B.	2.125 cm
C.	2.195 m
D.	2.195 cm
Answer» A. 2.125 m

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54.	Type of flow in which the fluid characteristics like velocity, pressure, density etc. at a point do not change with time is known as
A.	steady flow
B.	unsteady flow
C.	uniform flow
D.	non-uniform flow
Answer» A. steady flow

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55.	Type of flow in which the velocity at any given time changes with respect to space is known as
A.	steady flow
B.	unsteady flow
C.	uniform flow
D.	non-uniform flow
Answer» D. non-uniform flow

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56.	Type of flow in which the velocity at any given time does not change with respect to space is known as
A.	steady flow
B.	unsteady flow
C.	uniform flow
D.	non-uniform flow
Answer» C. uniform flow

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57.	Type of flow in which the fluid characteristics like velocity, pressure, density etc. at a point change with time is known as
A.	steady flow
B.	unsteady flow
C.	uniform flow
D.	non-uniform flow
Answer» B. unsteady flow

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58.	Type of flow in which the fluid particles also rotates about their own axes while flowing is known as
A.	compressible flow
B.	incompressible flow
C.	rotational flow
D.	ir-rotational flow
Answer» C. rotational flow

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59.	Type of flow in which fluid particles do not rotate about their own axes while flowing is known as
A.	compressible flow
B.	incompressible flow
C.	rotational flow
D.	ir-rotational flow
Answer» D. ir-rotational flow

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60.	Type of flow in which the density is constant for the fluid flow is known as
A.	compressible flow
B.	incompressible flow
C.	rotational flow
D.	ir-rotational flow
Answer» B. incompressible flow

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61.	Type of flow in which the density of fluid change from point to point is known as
A.	compressible flow
B.	incompressible flow
C.	rotational flow
D.	ir-rotational flow
Answer» A. compressible flow

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62.	The imaginary line, drawn in the fluid E in such a way that the tangent to any point gives the direction of motion (velocity) at the point is called
A.	stream line
B.	streak line
C.	potential line
D.	stream tube
Answer» A. stream line

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63.	The instantaneous pictures of the position of all fluid particles, which have passed through a given point at some previous time, are called
A.	stream line
B.	streak line
C.	potential line
D.	stream tube
Answer» B. streak line

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64.	The lines joining the points of equal potential (head) on adjacent low lines are called
A.	stream line
B.	streak line
C.	potential line
D.	stream tube
Answer» C. potential line

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65.	An element of fluid bonded by a number of stream lines, which confine the flow, is called
A.	stream line
B.	streak line
C.	potential line
D.	stream tube
Answer» D. stream tube

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66.	If Reynolds Number is between 2000 to 4000, the type of flow is,
A.	Laminar flow
B.	Transition flow
C.	Turbulent flow
D.	None of the above
Answer» B. Transition flow

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67.	If Reynolds Number is less than 2000, the type of flow is,
A.	Laminar flow
B.	Transition flow
C.	Turbulent flow
D.	None of the above
Answer» A. Laminar flow

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68.	If Reynolds Number is greater than 4000, the type of flow is,
A.	Laminar flow
B.	Transition flow
C.	Turbulent flow
D.	None of the above
Answer» C. Turbulent flow

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69.	“For a fluid flowing throw the pipe the quantity of fluid passing per second is constant at all section.” This is statement of
A.	Pascal’s law
B.	Continuity equation
C.	Bernoulli’s equation
D.	Darcy’s law
Answer» B. Continuity equation

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70.	The diameters of a pipe at the sections 1 and 2 are 10 cm and15 cm respectively. Find the discharge through the pipe if the velocity of water flowing through the pipe at section 1 is 5 m/s.
A.	0.00393 m3/sec
B.	0.0393 m3/sec
C.	0.393 m3/sec
D.	3.93 m3/sec
Answer» B. 0.0393 m3/sec

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71.	Liquid is flowing through 200 mm diameter tube with mean velocity of 2 m/sec. If density of liquid is 912 kg/m3 and viscosity is0.38 N.S/m2 find type of flow.
A.	Laminar flow
B.	Transition flow
C.	Turbulent flow
D.	None of the above
Answer» A. Laminar flow

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72.	The diameters of a pipe at the sections 1 and 2 are 10 cm and15 cm respectively. The velocity of water flowing through the pipe at section 1 is 5 m/s. Determine the velocity at section 2.
A.	0.22 m/sec
B.	0.45 m/sec
C.	2.22 m/sec
D.	4.40 m/sec
Answer» C. 2.22 m/sec

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73.	The energy possessed by a liquid particle by virtue of its position is known as
A.	potential energy
B.	kinetic energy
C.	pressure energy
D.	friction energy
Answer» A. potential energy

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74.	The energy possessed by a liquid particle by virtue of its existing pressure is known as
A.	potential energy
B.	kinetic energy
C.	pressure energy
D.	friction energy
Answer» C. pressure energy

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75.	The energy possessed by a liquid particle by virtue of its velocity or motion is known as
A.	potential energy
B.	kinetic energy
C.	pressure energy
D.	friction energy
Answer» B. kinetic energy

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76.	“In a steady, ideal flow of an incompressible fluid, the total energy at any point of the fluid is constant." This is statement of
A.	Pascal’s law
B.	Continuity equation
C.	Bernoulli’s equation
D.	Darcy’s law
Answer» C. Bernoulli’s equation

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77.	The Bernoulli’s equation is
A.	P1 = P2 = P3
B.	V1 A1 = V2 + A2
C.	E = Z + (V2/ 2g)+ (p /w)
D.	Z1 + P1/w + V12/2g = Z2 + P2/w + V22 /2g
Answer» D. Z1 + P1/w + V12/2g = Z2 + P2/w + V22 /2g

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78.	Application of Bernoulli’s Equation is
A.	Orifice meter
B.	Prandtl tube
C.	Venturi flume
D.	All of the above
Answer» D. All of the above

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79.	In converging cone area gradually __________ and hence velocity _____________.
A.	increase, increase
B.	increase, decrease
C.	decrease, increase
D.	decrease, decrease
Answer» C. decrease, increase

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80.	The angle of converging cone is about
A.	2.5°
B.	7°
C.	7.5°
D.	20°
Answer» D. 20°

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81.	The length of converging cone is about
A.	2.5 d1
B.	7 d1
C.	7.5 d1
D.	20 d1
Answer» A. 2.5 d1

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82.	In diverging cone area gradually __________ and hence velocity _____________.
A.	increase, increase
B.	increase, decrease
C.	decrease, increase
D.	decrease, decrease
Answer» B. increase, decrease

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83.	The angle of diverging cone is about
A.	2.5°
B.	7°
C.	7.5°
D.	20°
Answer» B. 7°

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84.	The length of diverging cone is about
A.	2.5 d1
B.	7 d1
C.	7.5 d1
D.	20 d1
Answer» C. 7.5 d1

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85.	A differential manometer is fitted between two ends of
A.	converging cone
B.	diverging cone
C.	throat
D.	none
Answer» A. converging cone

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86.	________________ is an Instrument to determine the velocity of flow at the required point in a pipe or a stream.
A.	Venturi meter
B.	orifice meter
C.	Pitot tube
D.	Venturiflume
Answer» C. Pitot tube

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87.	Pitot tube is consists of a glass tube bent through
A.	30°
B.	45°
C.	60°
D.	90°
Answer» D. 90°

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88.	Venturiflume is used to measure the flow in an open canal.
A.	true
B.	false
C.	all
D.	none
Answer» A. true

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89.	A 30 cm x 20 cm horizontal venturimeter is placed to measure the flow rate of water. The pressure difference between the inlet and the throat is 2.52 m (of water). Find the flow rate of the venturimeter with a constant of 0.98.
A.	0.241 m3/sec
B.	2.41 m3/sec
C.	0.241 lit/sec
D.	2.41 lit/sec
Answer» A. 0.241 m3/sec

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90.	An opening in a tank or vessel through which the liquid flows out is known as
A.	circle
B.	orifice
C.	notch
D.	weir
Answer» B. orifice

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91.	if H > 5 D, type of orifice is
A.	large orifice
B.	small orifice
C.	fully submerged orifice
D.	partially submerged orifice
Answer» B. small orifice

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92.	if H < 5 D, type of orifice is
A.	large orifice
B.	small orifice
C.	fully submerged orifice
D.	partially submerged orifice
Answer» A. large orifice

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93.	When discharge of orifice is free in the air, it is called
A.	large orifice
B.	free discharge orifice
C.	fully submerged orifice
D.	partially submerged orifice
Answer» B. free discharge orifice

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94.	When orifice discharge the liquid into some other vessel containing the liquid, and the outlet is completely submerged, the orifice is called
A.	large orifice
B.	free discharge orifice
C.	fully submerged orifice
D.	partially submerged orifice
Answer» C. fully submerged orifice

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95.	When orifice discharge the liquid in to some other vessel containing the liquid, and the outlet is partially under liquid the orifice is called
A.	large orifice
B.	free discharge orifice
C.	fully submerged orifice
D.	partially submerged orifice
Answer» D. partially submerged orifice

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96.	An average value of Cv is about
A.	0.62
B.	0.64
C.	0.75
D.	0.95 to 0.99
Answer» D. 0.95 to 0.99

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97.	An average value of Cc is about
A.	0.62
B.	0.64
C.	0.75
D.	0.95 to 0.99
Answer» B. 0.64

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98.	An average value of Cd is about
A.	0.62
B.	0.64
C.	0.75
D.	0.95 to 0.99
Answer» A. 0.62

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99.	From following which is correct?
A.	Cd = Cc × Cv
B.	Cc = Cd × Cv
C.	Cv = Cc × Cd
D.	None of the above
Answer» A. Cd = Cc × Cv

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100.	An average value of Cd is about 0.62.
A.	true
B.	false
C.	all
D.	none
Answer» B. false

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160+ Hydraulics Solved MCQs

A rectangular plate of 2 m x 3 m height is immersed in water vertically with top edge parallel to and at depth of 3 m below free surface. Calculate total water pressure.

An inverted triangular plate is having base parallel to water surface with width 1.6 m and height 2.10 m. It is submerged in water in such a way that its base is 1.0 m below free surface. Find total pressure.

A circular plate 2.5 m diameter is immersed in water with its greatest and lowest depth below the free surface being 3.0m and 1.0m respectively. Find the position of centre of pressure

Type of flow in which the fluid characteristics like velocity, pressure, density etc. at a point do not change with time is known as

Type of flow in which the velocity at any given time changes with respect to space is known as

Type of flow in which the velocity at any given time does not change with respect to space is known as

Type of flow in which the fluid characteristics like velocity, pressure, density etc. at a point change with time is known as

Type of flow in which the fluid particles also rotates about their own axes while flowing is known as

Type of flow in which fluid particles do not rotate about their own axes while flowing is known as

Type of flow in which the density is constant for the fluid flow is known as

Type of flow in which the density of fluid change from point to point is known as

The imaginary line, drawn in the fluid E in such a way that the tangent to any point gives the direction of motion (velocity) at the point is called

The instantaneous pictures of the position of all fluid particles, which have passed through a given point at some previous time, are called

The lines joining the points of equal potential (head) on adjacent low lines are called

An element of fluid bonded by a number of stream lines, which confine the flow, is called

If Reynolds Number is between 2000 to 4000, the type of flow is,

If Reynolds Number is less than 2000, the type of flow is,

If Reynolds Number is greater than 4000, the type of flow is,

“For a fluid flowing throw the pipe the quantity of fluid passing per second is constant at all section.” This is statement of

The diameters of a pipe at the sections 1 and 2 are 10 cm and15 cm respectively. Find the discharge through the pipe if the velocity of water flowing through the pipe at section 1 is 5 m/s.

Liquid is flowing through 200 mm diameter tube with mean velocity of 2 m/sec. If density of liquid is 912 kg/m3 and viscosity is0.38 N.S/m2 find type of flow.

The diameters of a pipe at the sections 1 and 2 are 10 cm and15 cm respectively. The velocity of water flowing through the pipe at section 1 is 5 m/s. Determine the velocity at section 2.

The energy possessed by a liquid particle by virtue of its position is known as

The energy possessed by a liquid particle by virtue of its existing pressure is known as

The energy possessed by a liquid particle by virtue of its velocity or motion is known as

“In a steady, ideal flow of an incompressible fluid, the total energy at any point of the fluid is constant." This is statement of

The Bernoulli’s equation is

Application of Bernoulli’s Equation is

In converging cone area gradually __________ and hence velocity _____________.

The angle of converging cone is about

The length of converging cone is about

In diverging cone area gradually __________ and hence velocity _____________.

The angle of diverging cone is about

The length of diverging cone is about

A differential manometer is fitted between two ends of

________________ is an Instrument to determine the velocity of flow at the required point in a pipe or a stream.

Pitot tube is consists of a glass tube bent through

Venturiflume is used to measure the flow in an open canal.

A 30 cm x 20 cm horizontal venturimeter is placed to measure the flow rate of water. The pressure difference between the inlet and the throat is 2.52 m (of water). Find the flow rate of the venturimeter with a constant of 0.98.

An opening in a tank or vessel through which the liquid flows out is known as

if H > 5 D, type of orifice is

if H < 5 D, type of orifice is

When discharge of orifice is free in the air, it is called

When orifice discharge the liquid into some other vessel containing the liquid, and the outlet is completely submerged, the orifice is called

When orifice discharge the liquid in to some other vessel containing the liquid, and the outlet is partially under liquid the orifice is called

An average value of Cv is about

An average value of Cc is about

An average value of Cd is about

From following which is correct?

An average value of Cd is about 0.62.

Liquid is flowing through 200 mm diameter tube with mean velocity of 2 m/sec. If density of
liquid is 912 kg/m3
and viscosity is0.38 N.S/m2
find type of flow.

In converging cone area gradually and hence velocity ___.

In diverging cone area gradually and hence velocity ___.