Mechanical Properties of Solids Test

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Mechanical Properties of Solids Test - 1

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Question 1
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According to Hooke’s law

A
For small deformations the stress and strain are inversely proportional to each other

B
For small deformations the stress and strain are proportional to each other

C
For large deformations the stress and strain are proportional to each other

D
For small deformations the stress is proportional to square of strain
Question 2
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A perfectly rigid body is one

A
whose shape and size change on application of force

B
which starts flowing like water on application of force

C
whose shape and size do not change on application of force

D
which does not move on application of force

Solution

Explanation:

A perfectly rigid body is hypothetical in nature but for some phenomena ( in rotational bodies ) we assume bodies are perfectly rigid i.e. the intermolecular forces are always in equilibrium irrespective of the external forces due to which their shape and size are constant.
Question 3
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Elasticity is the property of a body, by virtue of which

A
it changes size and shape when the force is applied and stays in that shape when applied force is removed

B
it tends to regain its original size and shape when the applied force is removed

C
it remains in original size and shape when the force is applied

D
it is distorted or stretches without the application of force

Solution

Explanation:

When external force is applied on the solid bodies, the solid bodies get deformed. The atoms or molecules are displaced from their equilibrium positions causing a change in the interatomic ( or intermolicular ) distances. When the deforming foce is removed, the interatomic forces tend to drive them back to their original postions. Thus the body regains its original shape and size.
Question 4
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The importance of the elastic behavior of materials is

A
that it enables a safe and sound design of bridges, buildings, machinery parts.

B
that it gives methods for understanding materials

C
that it is useful in building sling shots

D
that it is useful in making springs

Solution

Explanation:

More the elastic a material is , more it has the property to regain its original position which is required in construction works.
Question 5
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When a solid is deformed,

A
the atoms or molecules do not move from their equilibrium position

B
all the atoms or molecules are displaced from their equilibrium positions causing a change in inter atomic (or intermolecular) distances.

C
only the atoms or molecules at some points move from their equilibrium position

D
only the atoms or molecules of the surface move from their equilibrium position

Solution

Explanation:

External force permanently distubed the equilibrium position of the interatomic ( or intermolecular ) forces between the particles of solid bodies.
Question 6
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Stress is

A
total applied force

B
force per unit length

C
force per unit area

D
three point average of forces
Question 7
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The S.I unit of stress is

A
Pascal

B
Newton

C
Joule

D
Watt
Question 8
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If a wire has an initial length L and becomes L +ΔL on application of force, the longitudinal strain is given by

A
ΔL /L

B
ΔL /(2L)

C
ΔL

D
ΔL /(3L)
Question 9
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volume strain is defined

A
as the ratio of change in volume (ΔV) to twice the original volume V

B
as the change in volume ΔV

C
as the ratio of change in volume (ΔV) to thrice the original volume V

D
as the ratio of change in volume (ΔV) to the original volume V

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Mechanical Properties of Solids Test - 1

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Question 1

For small deformations the stress and strain are inversely proportional to each other

For small deformations the stress and strain are proportional to each other

For large deformations the stress and strain are proportional to each other

For small deformations the stress is proportional to square of strain

Question 2

whose shape and size change on application of force

which starts flowing like water on application of force

whose shape and size do not change on application of force

which does not move on application of force

Solution

Question 3

it changes size and shape when the force is applied and stays in that shape when applied force is removed

it tends to regain its original size and shape when the applied force is removed

it remains in original size and shape when the force is applied

it is distorted or stretches without the application of force

Solution

Question 4

that it enables a safe and sound design of bridges, buildings, machinery parts.

that it gives methods for understanding materials

that it is useful in building sling shots

that it is useful in making springs

Solution

Question 5

the atoms or molecules do not move from their equilibrium position

all the atoms or molecules are displaced from their equilibrium positions causing a change in inter atomic (or intermolecular) distances.

only the atoms or molecules at some points move from their equilibrium position

only the atoms or molecules of the surface move from their equilibrium position

Solution

Question 6

total applied force

force per unit length

force per unit area

three point average of forces

Question 7

Pascal

Newton

Joule

Watt

Question 8

ΔL /L

ΔL /(2L)

ΔL

ΔL /(3L)

Question 9

as the ratio of change in volume (ΔV) to twice the original volume V

as the change in volume ΔV

as the ratio of change in volume (ΔV) to thrice the original volume V

as the ratio of change in volume (ΔV) to the original volume V

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