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730+ Fluid Mechanics and Hydraulic Machines Solved MCQs

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

Chapters

Chapter: Fluids and Their Properties
1.

The branch of Engineering-science, which deals with water at rest or in motion is called

A. hydraulics
B. Fluid mechanics
C. Applied mechanics
D. Kinematics.
Answer» A. hydraulics
2.

A solid can resist which of the following stresses?

A. Tensile
B. Compressive
C. Shear
D. All of the above.
Answer» D. All of the above.
3.

.......... possesses no definite volume and is compressible.

A. Solid
B. Liquid
C. Gas
D. Vapour.
Answer» C. Gas
4.

The ratio of the specific weight of the liquid to the specific weight of a standard fluid is known as

A. Specific volume
B. Weight density
C. Specific gravity
D. Viscosity.
Answer» C. Specific gravity
5.

The property of a fluid which determines its resistance to shearing stress is called

A. Viscosity
B. Surface tension
C. Compressibility
D. None of the above.
Answer» A. Viscosity
6.

Fluids which do not follow the linear relationship between shear stress and rate of deformation are termed as.... fluids.

A. Newtonian
B. Non-Newtonian
C. Dilatant
D. ideal
Answer» B. Non-Newtonian
7.

The printer’s ink is an example of

A. Newtonian fluid
B. Non-Newtonian
C. Thixotropic substance
D. Elastic solid.
Answer» C. Thixotropic substance
8.

The viscosity of liquids ..... with increase in temperature.

A. Decreases
B. Increases
C. First decreases and then increases
D. First increases and then decreases.
Answer» A. Decreases
9.

Surface tension is caused by the force of ..... at the free surface.

A. Cohesion
B. Adhesion
C. Both (a) and (b)
D. None of the above.
Answer» A. Cohesion
10.

Which of the following is an example of phenomenon of surface tension?

A. Rain drops
B. Rise of sap in a tree
C. Break up of liquid jets
D. All of the above.
Answer» D. All of the above.
11.

Surface tension is expressed in

A. N/m
B. N/m2
C. N2/m
D. N/m3
Answer» A. N/m
12.

Pressure inside a water droplet is given by the relation

A. p = 4𝜎/d
B. p = 3𝜎/d
C. p = 8𝜎/d
D. p = 16𝜎/d
Answer» A. p = 4𝜎/d
13.

. ...... is a phenomenon by which a liquid rises into a thin glass tube above or below its general level.

A. Surface tension
B. Capillarity
C. Cohesion
D. Adhesion.
Answer» B. Capillarity
14.

The capillary rise of water in the glass tube is given by

A. h = 2σ/wd
B. h = 3σ/wd
C. h = 4σ/wd
D. h = 6σ/wd
Answer» C. h = 4σ/wd
15.

Elasticity of fluids is measured in terms of

A. Young’s modulus of elasticity
B. Shear modulus of elasticity
C. Bulk modulus of elasticity
D. None of the above.
Answer» C. Bulk modulus of elasticity
16.

Compressibility is the reciprocal of

A. Bulk modulus of elasticity
B. Shear modulus of elasticity
C. Young’s modulus of elasticity
D. Any of the above.
Answer» A. Bulk modulus of elasticity
17.

Bulk modulus of elasticity is the ratio of

A. Tensile stress to tensile strain
B. Compressive stress to compressive strain
C. Compressive stress to volumetric strain
D. None of the above.
Answer» C. Compressive stress to volumetric strain
18.

The value of bulk modulus of elasticity .......... with increase of pressure.

A. Increases
B. Decreases
C. Either of the above
D. None of the above.
Answer» A. Increases
19.

The pressure of a liquid on a surface will always act ...... to the surface.

A. Parallel
B. Normal
C. 45°
D. 60°.
Answer» B. Normal
20.

The pressure ....... as the depth of the liquid increases.

A. Increases
B. Decreases
C. Remain unchanged
D. None of the above.
Answer» A. Increases
21.

The intensity of pressure in a liquid due to its depth will vary .... with depth.

A. Directly
B. Indirectly
C. Either of the above
D. None of the above.
Answer» A. Directly
22.

The height of the free surface above any point is known as

A. Static head
B. Intensity of pressure
C. Either of the above
D. None of the above.
Answer» A. Static head
23.

“The intensity of pressure at any point in a liquid at rest is the same in all directions.” The above statement is known as

A. Kirchhoff’s law
B. Pascal’s law
C. Either of the above
D. None of the above.
Answer» B. Pascal’s law
24.

Any pressure measured above the absolute zero of pressure is termed as

A. Atmospheric pressure
B. Gauge pressure
C. Either of the above
D. None of the above
Answer» C. Either of the above
25.

The fundamental S.I. unit of pressure is N/m2; this is also known as ......

A. Pascal
B. Stoke
C. Poise
D. None of the above
Answer» A. Pascal
Chapter: Static Forces on Surface and Buoyancy
26.

The intensity of pressure p is related to specific weight w of the liquid and vertical depth h of the point by the equation

A. p = wh
B. h = pw
C. p = wh2
D. p = wh3.
Answer» A. p = wh
27.

The point of application of the total pressure on the surface is

A. Centroid of the surface
B. Centre of pressure
C. Either of the above
D. None of the above.
Answer» B. Centre of pressure
28.

If A is the area of the immersed surface, w is the specific weight of the liquid and ͞x is the depth of horizontal surface from the liquid surface, then the total pressure P on the surface is given by

A. p = wA2 ͞x
B. p = w2A ͞x
C. p = wA ͞x
D. p = wA ͞x2
Answer» C. p = wA ͞x
29.

The side of the dam to which the water from the river or the stream approaches is known as

A. Downstream
B. Upstream
C. Either of the above
D. None of the above.
Answer» B. Upstream
30.

Lock gates are provided to

A. Change the water level in a canal or river for irrigation
B. Store water for irrigation purpose
C. Either of the above
D. None of the above.
Answer» A. Change the water level in a canal or river for irrigation
31.

The term........ means the study of pressure exerted by a fluid at rest.

A. Hydrostatics
B. Fluid mechanics
C. Continuum
D. Kinetics
Answer» A. Hydrostatics
32.

The tendency for an immersed body to be lifted up in the fluid, due to an upward force opposite to the action of gravity is known as

A. Buoyancy
B. Centre of buoyancy
C. Buoyant force
D. None of the above.
Answer» A. Buoyancy
33.

The magnitude of the buoyant force can be determined by

A. Newton’s second law of motion
B. Archimedes’ principle
C. Principle of moments
D. None of the above.
Answer» B. Archimedes’ principle
34.

When a body is immersed in a fluid, partially or completely, the force of buoyancy is equal to

A. The weight of the body
B. The weight of the fluid displaced by the body
C. The weight of the volume of the fluid equal to the volume of body
D. None of the above.
Answer» B. The weight of the fluid displaced by the body
35.

The point of application of the force of buoyancy on the body is known as

A. Centre of gravity
B. Centre of buoyancy
C. Metacenter
D. None of the above.
Answer» B. Centre of buoyancy
36.

“When a body is immersed in a fluid either wholly or partially, it is buoyed or lifted up by a force which is equal to the weight of fluid displaced by the body”. This principle was enunciated by

A. Archimedes
B. Newton
C. Pascal
D. Kirchhoff.
Answer» A. Archimedes
37.

A floating body is in stable equilibrium when

A. The metacentre is below its centre of gravity
B. The metacentre is above its centre of gravity
C. The metacentric height is zero.
D. Its centre of gravity is below the centre of buoyancy.
Answer» B. The metacentre is above its centre of gravity
38.

An ice-cube is floating in glass of water. As the cube melts the water level

A. Remain constant
B. Falls
C. Rises
D. None of the above.
Answer» B. Falls
39.

Metacentric height can be determined by

A. Only analytical method
B. Only experimental method
C. Both (a) and (b)
D. None of the above.
Answer» C. Both (a) and (b)
40.

If a body does not return to its original position from the slightly displaced angular position and heels farther away, when given a small angular displacement; such an equilibrium is called

A. Stable equilibrium
B. Unstable equilibrium
C. Neutral equilibrium
D. Any of the above
Answer» B. Unstable equilibrium
Chapter: Motion of Fluid Particles and Streams
41.

The motion of fluid particles may be described by which of the following methods?

A. Langrangian method
B. Eulerain method
C. Both (a) and (b)
D. None of the above.
Answer» C. Both (a) and (b)
42.

In which of the following methods, the observer concentrates on a point in the fluid system?

A. Langrangian method
B. Eulerian method
C. Any of the above
D. None of the above.
Answer» D. None of the above.
43.

Normal acceleration in fluid-flow situation exists only when

A. The flow is unsteady
B. The flow is two-dimensional
C. The streamlines are straight and parallel
D. The streamlines are curved.
Answer» B. The flow is two-dimensional
44.

In a steady flow the velocity

A. Does not change from place to place
B. At a given point does not change with time
C. May change its direction but the magnitude remains unchanged
D. None of the above.
Answer» B. At a given point does not change with time
45.

The flow in a pipe whose valve is being opened or closed gradually is an example of

A. Steady flow
B. Unsteady flow
C. Rotational flow
D. Compressible flow.
Answer» B. Unsteady flow
46.

The type of flow in which the velocity at any given time does not change with respect to space is called

A. Steady flow
B. Compressible flow
C. Uniform flow
D. Rotational flow.
Answer» C. Uniform flow
47.

Flow in a pipe where average flow parameters are considered for analysis is an example of

A. Incompressible flow
B. One-dimensional flow
C. Two-dimensional flow
D. Three-dimensional flow.
Answer» B. One-dimensional flow
48.

The flow in a river during the period of heavy rainfall is

A. Steady, non-uniform and three-dimensional
B. Steady, uniform, two-dimensional
C. Unsteady, uniform, three-dimensional
D. Unsteady, non-uniform and three-dimensional.
Answer» D. Unsteady, non-uniform and three-dimensional.
49.

Flow between parallel plates of infinite extent is an example of

A. One-dimensional flow
B. Two-dimensional flow
C. Three-dimensional flow
D. Compressible flow.
Answer» B. Two-dimensional flow
50.

If the flow is irrational as well as steady it is known as

A. Non-uniform flow
B. One-dimensional flow
C. Potential flow
D. None of the above.
Answer» C. Potential flow

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