Mechanical Properties of Solids Test

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Mechanical Properties of Solids Test - 2

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Question 1
1 / -0

A perfectly rigid body is one

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

B
whose shape and size change on application of force

C
which does not move on application of force

D
which starts flowing like water on application of force

Solution

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 2
1 / -0

Elasticity is the property of a body, by virtue of which

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

B
it is distorted or stretches without the application of force

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

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

Solution

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 3
1 / -0

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 is useful in building sling shots

C
that it gives methods for understanding materials

D
that it is useful in making springs

Solution

More the elastic a material is , more it has the property to regain its original position which is required in construction works.
Question 4
1 / -0

When a solid is deformed,

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

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

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

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

Solution

External force permanently distubed the equilibrium position of the interatomic ( or intermolecular ) forces between the particles of solid bodies.
Question 5
1 / -0

Stress is

A
force per unit length

B
three point average of forces

C
total applied force

D
restoring force per unit area

Solution

Stress is defined as restoring force per unit area.
Question 6
1 / -0

The S.I. unit of stress is

A
Newton

B
Pascal

C
Watt

D
Joule

Solution

As,
Putting units, we get
Stress = N/m²
= Nm^-2 or Pascal
So SI Unit of Stress is Pascal
Question 7
1 / -0

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

A
△L/3L

B
△L/2L

C
ΔL

D
△L/L

Solution

longitudinal strain is defined as ratio of change in length ∆L and natural length L i.e. longitudinal strain =△L/L
Question 8
1 / -0

volumetric strain is defined

A
as the change in volume ΔV

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

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

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

Solution

By definition of volumetric strain, it is the ratio of change in volume of the body to its original volume
= ΔV/V
Hence volume strain is defined
as the ratio of change in volume (ΔV) to the original volume V

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Re-Attempt Weekly Quiz Competition

Mechanical Properties of Solids Test - 2

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Mechanical Properties of Solids Test - 2

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Question 1

whose shape and size do not change on application of force

whose shape and size change on application of force

which does not move on application of force

which starts flowing like water on application of force

Solution

Question 2

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

it is distorted or stretches without the application of force

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

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

Solution

Question 3

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

that it is useful in building sling shots

that it gives methods for understanding materials

that it is useful in making springs

Solution

Question 4

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

the atoms or molecules do not move from their equilibrium position

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

Solution

Question 5

force per unit length

three point average of forces

total applied force

restoring force per unit area

Solution

Question 6

Newton

Pascal

Watt

Joule

Solution

Question 7

△L/3L

△L/2L

ΔL

△L/L

Solution

Question 8

as the change in volume ΔV

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

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

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

Solution

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