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
With reference to figure the tensile stress corresponds to stress at point
Question 1 figure 1
  • A
    E
  • B
    B
  • C
    D
    Correct
  • D
    C
2
Elastomers are materials
  • A
    which can be stretched without corresponding stress
  • B
    which cannot be stretched to beyond elastic limit
  • C
    which can be stretched to cause large strains
    Correct
  • D
    which cannot be stretched to cause large strains
3
Young’s modulus Y is
  • A
    the ratio of shear stress \(\left( \sigma \right)\) to the longitudinal strain \(\left( {\theta {\rm{ }}} \right)\)
  • B
    the ratio of longitudinal strain \(\left( {\varepsilon {\rm{ }}} \right)\) to the tensile (or compressive) stress \(\left( \sigma \right)\)
  • C
    the ratio of tensile (or compressive) stress \(\left( \sigma \right)\) to the longitudinal strain \(\left( {\varepsilon {\rm{ }}} \right)\)
    Correct
  • D
    the ratio of shear strain \(\left( {\theta {\rm{ }}} \right)\) to the longitudinal stress \(\left( \sigma \right)\)
4
Shear modulus or modulus of rigidity is
  • A
    the ratio of shearing stress to the corresponding lateral strain
  • B
    the ratio of shearing stress to the corresponding shearing strain
    Correct
  • C
    the ratio of shearing strain to the corresponding shearing stress
  • D
    the ratio of longitudinal stress to the corresponding shearing strain
5
Bulk modulus is
  • A
    the ratio of lateral stress to the corresponding hydraulic strain
  • B
    the ratio of longitudinal stress to the corresponding hydraulic strain
  • C
    the ratio of hydraulic stress to the corresponding hydraulic strain
    Correct
  • D
    the ratio of hydraulic strain to the corresponding hydraulic stress
6
For a rope of yield strength \({{\rm{S}}_{\rm{y}}}\) loaded in tension with weight Mg the minimum area A of the rope should be
  • A
    A \( \geq \) Mg/3 \({{\rm{S}}_{\rm{y}}}\)
  • B
    A \( \geq \) Mg/ \({{\rm{S}}_{\rm{y}}}\)
    Correct
  • C
    A \( \geq \) Mg/2 \({{\rm{S}}_{\rm{y}}}\)
  • D
    A \( \geq \) Mg \({{\rm{S}}_{\rm{y}}}\)
7
For a bar of length l, breadth b, and depth d as shown in figure the deflection \(\delta \) is given by
Question 7 figure 1
  • A
    \(\delta = W{l^3}/\left( {4b{d^3}} \right)\)
  • B
    \(\delta = W{l^2}/\left( {4b{d^3}Y} \right)\)
  • C
    \(\delta = W{l^3}/\left( {4b{d^2}Y} \right)\)
  • D
    \(\delta = W{l^3}/\left( {4b{d^3}Y} \right)\)
    Correct
8
Rectangular section is rarely used in beams because
  • A
    stresses are uniform in a rectangular section
  • B
    stresses are always plastic in rectangular section
  • C
    more material in kilos is required
    Correct
  • D
    less material in kilos is required
9
Columns are loaded in
  • A
    compression
    Correct
  • B
    tension
  • C
    hydraulic stress
  • D
    shear
10
Material is said to be ductile if
  • A
    a large amount of plastic deformation takes place between the elastic limit and the fracture point
    Correct
  • B
    material breaks suddenly at little elongation
  • C
    material cross section is not significantly reduced at failure
  • D
    fracture occurs soon after the elastic limit is passed
11
Material is said to be brittle if
  • A
    material cross section is significantly reduced at failure
  • B
    material elongates a lot before finally breaking
  • C
    fracture occurs soon after the elastic limit is passed
    Correct
  • D
    a large amount of plastic deformation takes place between the elastic limit and the fracture point
12
A steel wire of length 4.7 m and cross-sectional area 3.0 \( \times \) \({\rm{1}}{0^{ - {\rm{5}}}}\) \({{\rm{m}}^{\rm{2}}}\) stretches by the same amount as a copper wire of length 3.5 m and cross-sectional area of 4.0 \( \times \) \({\rm{1}}{0^{ - {\rm{5}}}}\) \({{\rm{m}}^{\rm{2}}}\) under a given load. What is the ratio of the Young’s modulus of steel to that of copper?
  • A
    1.6
  • B
    2.0
  • C
    1.8
    Correct
  • D
    1.2
13
Figure shows the strain-stress curve for a given material. What is the Young’s modulus?
Question 13 figure 1
  • A
    8.5 \( \times \) \({\rm{1}}{0^{{\rm{1}}0}}\) \({\rm{N}}/{{\rm{m}}^{\rm{2}}}\)
  • B
    6.5 \( \times \) \({\rm{1}}{0^{{\rm{1}}0}}\) \({\rm{N}}/{{\rm{m}}^{\rm{2}}}\)
  • C
    7.5 \( \times \) \({\rm{1}}{0^{{\rm{1}}0}}\) \({\rm{N}}/{{\rm{m}}^{\rm{2}}}\)
    Correct
  • D
    9.5 \( \times \) \({\rm{1}}{0^{{\rm{1}}0}}\) \({\rm{N}}/{{\rm{m}}^{\rm{2}}}\)
14
Figure shows the strain-stress curve for a given material. What is the approximate yield strength for this material?
Question 14 figure 1
  • A
    3.4 \( \times \) \({\rm{1}}{0^{\rm{8}}}\) \({\rm{N}}/{{\rm{m}}^{\rm{2}}}\)
  • B
    3.2 \( \times \) \({\rm{1}}{0^{\rm{8}}}\) \({\rm{N}}/{{\rm{m}}^{\rm{2}}}\)
  • C
    3.0 \( \times \) \({\rm{1}}{0^{\rm{8}}}\) \({\rm{N}}/{{\rm{m}}^{\rm{2}}}\)
    Correct
  • D
    3.6 \( \times \) \({\rm{1}}{0^{\rm{8}}}\) \({\rm{N}}/{{\rm{m}}^{\rm{2}}}\)
15
A steel rod 2.0 m long has a cross-sectional area of 0.30 \({\rm{c}}{{\rm{m}}^{\rm{2}}}\). It is hung by one end from a support, and a 550-kg milling machine is hung from its other end. Determine the stress on the rod.
  • A
    1.8 \( \times \) \({\rm{1}}{0^{\rm{8}}}\) Pa
    Correct
  • B
    1.6 \( \times \) \({\rm{1}}{0^{\rm{8}}}\) Pa
  • C
    1.2 \( \times \) \({\rm{1}}{0^{\rm{8}}}\) Pa
  • D
    1.4 \( \times \) \({\rm{1}}{0^{\rm{8}}}\) Pa