Mechanical Properties Of Solids CBSE Questions & Answers

Mechanical Properties Of Solids

This is Physics Class 11 Mechanical Properties of Solids CBSE Questions & Answers. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
A perfectly rigid body is one
  • A
    which does not move on application of force
  • B
    whose shape and size change on application of force
  • C
    whose shape and size do not change on application of force
    Correct
  • D
    which starts flowing like water on application of force
2
Elasticity is the property of a body, by virtue of which
  • A
    it remains in original size and shape when the force is applied
  • B
    it tends to regain its original size and shape when the applied force is removed
    Correct
  • C
    it is distorted or stretches without the application of force
  • D
    it changes size and shape when the force is applied and stays in that shape when applied force is removed
3
For the earth the escape speed in terms of g the acceleration due to gravity and RE the radius of the earth is
  • A
    \(\sqrt {2g{R_E}} \)
    Correct
  • B
    \(\sqrt {g{R_E}} \)
  • C
    \(\sqrt {5g{R_E}} \)
  • D
    \(\sqrt {2g} \)
4
The importance of the elastic behavior of materials is
  • A
    that it gives methods for understanding materials
  • B
    that it is useful in building sling shots
  • C
    that it is useful in making springs
  • D
    that it enables a safe and sound design of bridges, buildings, machinery parts.
    Correct
5
When a solid is deformed,
  • A
    only the atoms or molecules at some points 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.
    Correct
  • C
    only the atoms or molecules of the surface move from their equilibrium position
  • D
    the atoms or molecules do not move from their equilibrium position
6
Stress is
  • A
    force per unit area
    Correct
  • B
    force per unit length
  • C
    total applied force
  • D
    three point average of forces
7
The S.I unit of stress is
  • A
    Joule
  • B
    Newton
  • C
    Watt
  • D
    Pascal
    Correct
8
If a wire has an initial length L and becomes L + \(\Delta {\rm{L}}\) on application of force, the longitudinal strain is given by
  • A
    \(\Delta {\rm{L}}\) /L
    Correct
  • B
    \(\Delta {\rm{L}}\) /(2L)
  • C
    \(\Delta {\rm{L}}\) /(3L)
  • D
    \(\Delta {\rm{L}}\)
9
Referring to figure shearing strain is defined as.
Question 9 figure 1
  • A
    \(\cot \theta \)
  • B
    the ratio of relative displacement of the faces \(\Delta {\rm{x}}\) to the length of the cylinder L
    Correct
  • C
    \(\sin \theta \)
  • D
    \(\cos \theta \)
10
volume strain is defined
  • A
    as the change in volume \(\Delta \)V
  • B
    as the ratio of change in volume (\(\Delta \)V) to the original volume V
    Correct
  • C
    as the ratio of change in volume (\(\Delta \)V) to thrice the original volume V
  • D
    as the ratio of change in volume (\(\Delta \)V) to twice the original volume V
11
According to Hooke’s law
  • A
    For large deformations the stress and strain are proportional to each other
  • B
    For small deformations the stress and strain are proportional to each other
    Correct
  • C
    For small deformations the stress and strain are inversely proportional to each other
  • D
    For small deformations the stress is proportional to square of strain
12
With reference to figure the elastic zone is
Question 12 figure 1
  • A
    AB
  • B
    OA
    Correct
  • C
    CD
  • D
    BC
13
With reference to figure the plastic zone is
Question 13 figure 1
  • A
    CD
    Correct
  • B
    OA
  • C
    AB
  • D
    BC
14
With reference to figure the yield point corresponds to
Question 14 figure 1
  • A
    B
    Correct
  • B
    A
  • C
    D
  • D
    C
15
With reference to figure the yield stress corresponds to stress at point
Question 15 figure 1
  • A
    A
  • B
    D
  • C
    C
  • D
    B
    Correct