Class 12 Dual Nature Of Radiation And Matter CBSE Questions & Answers

Class 12 · Dual Nature Of Radiation And Matter

This is Physics Class 12 Dual Nature Of Radiation and Matter CBSE Questions & Answers. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
Photon has a charge of
  • A
    -2e; e= charge on electron
  • B
    -e; e= charge on electron
  • C
    +2e; e= charge on electron
  • D
    zero
    Correct
2
Photons can be
  • A
    deflected by magnetic fields
  • B
    scattered
    Correct
  • C
    deflected by magnetic fields
  • D
    deflected by electric fields
3
In a photon-particle collision (such as photon-electron collision) the quantity which is not conserved is
  • A
    None of the above
  • B
    total energy
  • C
    number of photons
    Correct
  • D
    total momentum
4
De Broglie proposed that the wave length \(\lambda \) associated with a particle of momentum p = mv is given as
  • A
    \({h \over {2mv}}\)
  • B
    \({h \over {mv}}\)
    Correct
  • C
    \({{2h} \over {mv}}\)
  • D
    \({{mv} \over h}\)
5
Davisson Germer experiment proves that
  • A
    electrons exhibit particle nature
  • B
    electrons exhibit wave nature
    Correct
  • C
    protons exhibit wave nature
  • D
    neutrons exhibit wave nature
6
A photon is
  • A
    a quantum of light energy
    Correct
  • B
    an instrument for measuring light intensity
  • C
    a positive charged particle
  • D
    a quantum of matter
7
A photoelectric cell converts
  • A
    light energy into heat energy
  • B
    light energy into sound energy
  • C
    electric into light energy
  • D
    light energy into electric energy
    Correct
8
The momentum of photon having energy E is
  • A
    Zero
  • B
    E/h
  • C
    \({\rm{E}}/{{\rm{c}}^{\rm{2}}}\)
  • D
    E/c
    Correct
9
Photo-electric effect can be explained only by assuming that light
  • A
    can be polarized
  • B
    is a form of transverse waves
  • C
    consists of quanta
    Correct
  • D
    is a form of longitudinal waves
10
The energy of a photon corresponding to the visible light of maximum wavelength is approximately
  • A
    7 eV
  • B
    1 eV
  • C
    1.6 eV
    Correct
  • D
    3.2 eV
11
In order to increase the kinetic energy of ejected photoelectrons, there should be an increase in
  • A
    Both the wavelength and intensity of radiation
  • B
    frequency of radiation
    Correct
  • C
    intensity of radiation
  • D
    wavelength of radiation
12
If h is Planck’s constant, the momentum of a photon of wavelength 0.01 \(\mathop A\limits^0 \) is
  • A
    h
  • B
    \({\rm{1}}{0^{\rm{2}}}\)h
  • C
    \({\rm{1}}{0^{{\rm{12}}}}\)h
    Correct
  • D
    \({\rm{1}}{0^{{\rm{12}}}}\)h
13
Planck’s constant has the dimensions of
  • A
    Force
  • B
    Angular momentum
    Correct
  • C
    Linear momentum
  • D
    Energy
14
Number of ejected photoelectrons increases with increase
  • A
    in wavelength of light
  • B
    never
  • C
    in intensity of light
    Correct
  • D
    in frequency of light
15
A photon behaves as if it had a mass equal to
  • A
    hvc
  • B
    \({\rm{hv}}/{{\rm{c}}^{\rm{2}}}\)
    Correct
  • C
    hv/c
  • D
    \({{\rm{c}}^{\rm{2}}}\)/hv