Kinetic Theory CBSE Questions & Answers

Kinetic Theory

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

Questions & Answers

1
Kinetic theory explains the behavior
  • A
    of solids and liquids based on the idea that they gas consist of rapidly vibrating atoms or molecules
  • B
    of solids based on the idea that the solid consists of rapidly vibrating atoms or molecules
  • C
    of gases based on the idea that the gas consists of rapidly moving atoms or molecules
    Correct
  • D
    of liquids based on the idea that the liquids consist of rapidly moving atoms or molecules
2
Kinetic theory
  • A
    correctly explains specific heat capacities of many liquids
  • B
    correctly explains specific heat capacities of many solids
  • C
    correctly explains specific heat capacities of many gases
    Correct
  • D
    correctly explains specific heat capacities of super cooled liquids
3
Kinetic theory relates measurable properties.
  • A
    of super cooled liquids such as viscosity, creep and diffusion with molecular parameters, yielding estimates of molecular sizes and masses
  • B
    of solids such as expansion, conduction and elongation with molecular parameters, yielding estimates of molecular sizes and masses
  • C
    of gases such as viscosity, conduction and diffusion with molecular parameters, yielding estimates of molecular sizes and masses
    Correct
  • D
    of liquids such as viscosity, conduction and diffusion with molecular parameters, yielding estimates of molecular sizes and masses
4
According to Atomic Hypothesis:
  • A
    All things are made of atoms - little particles that stay put at fixed points
  • B
    All things are made of atoms - little particles that move around in perpetual motion
    Correct
  • C
    All things are made of atoms - little particles that keep oscillating
  • D
    All things are made of atoms - little particles that move around in circles
5
According to Avogadro’s law:
  • A
    Equal volumes of all gases at equal temperature and pressure have the same number of molecules.
    Correct
  • B
    Equal volumes of all gases at equal pressure have the same number of molecules.
  • C
    Equal volumes of all gases at equal temperature have the same number of molecules.
  • D
    Equal volumes of all gases at equal temperature and pressure have different number of molecules.
6
In which case are the atoms relatively rigidly fixed?
  • A
    gases
  • B
    liquids
  • C
    solids
    Correct
  • D
    liquids and gases
7
The order of inter atomic distance in liquids is about
  • A
    \(1000\dot A\)
  • B
    \(2\dot A\)
    Correct
  • C
    \(100\dot A\)
  • D
    \(20\dot A\)
8
The average distance a molecule can travel without colliding is called the
  • A
    mean free distance
  • B
    mean free length
  • C
    mean free motion
  • D
    mean free path
    Correct
9
In dynamic equilibrium, molecules collide and change their speeds during the collision
  • A
    but the r.m.s properties vary.
  • B
    but the peak properties vary.
  • C
    but the average properties vary.
  • D
    but the average properties are constant.
    Correct
10
The perfect gas equation can be written as
  • A
    P = \(\mu \) RTV
  • B
    PV = \(\mu \) RT
    Correct
  • C
    PV = \(\mu \) R
  • D
    PV = RT
11
Consider a mixture of non-interacting ideal gases: \({\mu _{\rm{1}}}\) moles of gas 1, \({\mu _{\rm{2}}}\) moles of gas 2, etc. in a vessel of volume V at temperature T and pressure P. It is then found that the equation of state of the mixture is :
  • A
    V = (\(\mu {\rm{1}}\) + \({\mu _{\rm{2}}}\) +…) RT
  • B
    P = (\(\mu {\rm{1}}\) + \({\mu _{\rm{2}}}\)+…) RT
  • C
    PV = (\(\mu {\rm{1}}\) + \({\mu _{\rm{2}}}\) +…) RT
    Correct
  • D
    PV = (\(\mu {\rm{1}}\) + \({\mu _{\rm{2}}}\) +…) R
12
According to Dalton’s law of partial pressures:
  • A
    total pressure of a mixture of ideal gases is the difference of partial pressures
  • B
    total pressure of a mixture of ideal gases is the sum of partial pressures
    Correct
  • C
    total pressure of a mixture of real gases is the sum of factored individual pressures
  • D
    total pressure of a mixture of ideal gases is the sum of pressures
13
Considering a gas in a parallelopiped, in a small time interval \(\Delta {\rm{t}}\), a molecule with x-component of velocity \({{\rm{v}}_{\rm{x}}}\) will hit the wall
  • A
    if it is outside or beyond the distance \({{\rm{v}}_{\rm{x}}}\) \(\Delta {\rm{t}}\) from the wall
  • B
    if it is within the distance \({{\rm{v}}_{\rm{x}}}\) \(\Delta {\rm{t}}\) from the wall
    Correct
  • C
    if it is outside or beyond the distance \({\rm{2}}{{\rm{v}}_{\rm{x}}}\) \(\Delta {\rm{t}}\) from the wall
  • D
    if it is within the distance \({\rm{2}}{{\rm{v}}_{\rm{x}}}\) \(\Delta {\rm{t}}\) from the wall
14
If there are n number of molecules per unit volume and m is the mass of each , \({{\rm{v}}_{\rm{x}}}\) is the x-component of velocity, pressure can be written as
  • A
    \(P = nm\overline {v_x^2} \)
    Correct
  • B
    \(P = n\overline {v_x^2} \)
  • C
    \(P = m\overline {v_x^2} \)
  • D
    \(P = 2nm\overline {v_x^2} \)
15
The average kinetic energy of a molecule
  • A
    is not dependent on absolute temperature of the gas
  • B
    is inversely proportional to the molecular mass of the gas
  • C
    is inversely proportional to the absolute temperature of the gas
  • D
    is proportional to the absolute temperature of the gas
    Correct