Thermal Properties Of Matter CBSE Questions & Answers

Thermal Properties Of Matter

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

Questions & Answers

1
For an ideal gas the coefficient of volume expansion at constant pressure is
  • A
    1/T; T is the temperature
    Correct
  • B
    1/3T; T is the temperature
  • C
    2/T; T is the temperature
  • D
    1/2T; T is the temperature
2
The coefficient of volume expansion is n times coefficient of linear expansion where n equals
  • A
    4
  • B
    3.0
    Correct
  • C
    2
  • D
    5
3
The coefficient of area expansion is n times coefficient of linear expansion where n equals
  • A
    2.0
    Correct
  • B
    3
  • C
    5
  • D
    4
4
Thermal stress is stress induced in solids
  • A
    if thermal expansion is prevented by fixing its ends rigidly
    Correct
  • B
    if thermal expansion is allowed by floating it’s ends
  • C
    due to dropping in cold water
  • D
    due to vibration of molecules
5
If m is the mass of a substance, \(\Delta {\rm{Q}}\) the energy required to raise the temperature by \(\Delta {\rm{T}}\) the specific heat is given by
  • A
    \(s = {1 \over m}{{Q} \over {T}}\)
    Correct
  • B
    s = m\(\Delta {\rm{Q}}\).\(\Delta {\rm{T}}\)
  • C
    s = \(\Delta {\rm{Q}}\).\(\Delta {\rm{T}}\)
  • D
    s = \(\Delta {\rm{Q}}\) / \(\Delta {\rm{T}}\)
6
The latent heat of fusion is. \(\left( {{{\rm{L}}_{\rm{f}}}} \right)\)
  • A
    the heat per unit mass required changing a substance from solid into liquid, at the same temperature and pressure
    Correct
  • B
    the heat per unit mass required changing a substance from liquid into solid, at the same temperature and pressure
  • C
    the heat per unit mass required changing a substance from solid into liquid, at high temperature and low pressure
  • D
    the heat per unit mass required changing a substance from solid into liquid, at high pressure and low temperature
7
The latent heat of vaporization \(\left( {{{\rm{L}}_{\rm{v}}}} \right)\) is.
  • A
    the heat per unit mass required to change a substance from liquid to the vapor state , at high temperature and low pressure
  • B
    the heat per unit mass required to change a substance from vapor to the liquid state without change in the temperature and pressure
  • C
    the heat per unit mass required to change a substance from liquid to the vapor state at high pressure and low temperature
  • D
    the heat per unit mass required to change a substance from liquid to the vapor state without change in the temperature and pressure
    Correct
8
In which mode of heat transfer no medium is required?
  • A
    radiation
    Correct
  • B
    none of the three
  • C
    conduction
  • D
    convection
9
In which mode of heat transfer is there material movement?
  • A
    radiation
  • B
    conduction
  • C
    convection
    Correct
  • D
    none of the three
10
if k is the thermal conductivity of the material of the bar of cross section A whose ends are maintained at temperatures \({T_C}\) and \({T_D}\), the rate of flow of heat H is :
  • A
    \(H = kA{{{T_C} + {T_D}} \over {2L}}\)
  • B
    \(H = kA{{{T_C} - {T_D}} \over L}\)
    Correct
  • C
    \(H = kA{{{T_C} + {T_D}} \over L}\)
  • D
    \(H = kA{{{T_C} - {T_D}} \over {2L}}\)
11
If \({{\rm{T}}_{\rm{1}}}\)is the temperature of the surrounding medium and \({{\rm{T}}_{\rm{2}}}\) is the temperature of the body, then according to Newton’s Law of Cooling rate of cooling of the body is
  • A
    \({{dQ} \over {dt}} = k({T_2} + {T_1})\)
  • B
    \({{dQ} \over {dt}} = - k({T_2} - {T_1})\)
    Correct
  • C
    \({{dQ} \over {dt}} = k({T_2} - {T_1})\)
  • D
    \({{dQ} \over {dt}} = - k({T_2} + {T_1})\)
12
The average kinetic energy of the molecules in a substance is most closely associated with
  • A
    expansion
  • B
    absolute zero
  • C
    temperature
    Correct
  • D
    heat
13
The Celsius temperature at absolute zero is equal to
  • A
    100\(^\circ \) C
  • B
    -100\(^\circ \) C
  • C
    273\(^\circ \) C
  • D
    -273\(^\circ \) C
    Correct
14
Which of the following is true of the Celsius and Kelvin temperature scales?
  • A
    A Kelvin degree and a Celsius degree are equivalent in size.
    Correct
  • B
    A Kelvin degree is smaller in size than a Celsius degree.
  • C
    A Kelvin degree is larger in size than a Celsius degree.
  • D
    Both the Celsius and Kelvin temperature scales have negative values.
15
In general, when a solid is heated, it
  • A
    expands proportionally to the change in temperature
    Correct
  • B
    expands inversely proportionally to the change in temperature
  • C
    contracts inversely proportionally to the change in temperature
  • D
    contracts proportionally to the change in temperature