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Dual Nature of Radiation and Matter 1 Mark Creative Question Paper With Answer Key

12th Standard

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Physics

Time : 00:20:00 Hrs
Total Marks : 15

    Multiple Choice Question 

    15 x 1 = 15
  1. P and E denote the linear momentum and energy of a photon. If the wavelength is decreased ____________.

    (a)

    Both P and E increase

    (b)

    P increases and E decreases

    (c)

    P decreases and E increases

    (d)

    both P & E decrease

  2. The work function of a metal is hv0. Light of frequency v falls on this metal. The photoelectric effect will take place only if ___________.

    (a)

    \(\geq\) v0

    (b)

    v > 2vo

    (c)

    vo

    (d)

    v > vo/2

  3. When stopping potential is applied in an experiment on the photoelectric effect no photocurrent is observed. This means that ______________.

    (a)

    The emission of photoelectrons is stopped

    (b)

    The photoelectrons are emitted but are reabsorbed by the emitter metal

    (c)

    The photo electrons are accumulated near the collector plate

    (d)

    The photoelectrons are dispersed from the sides of the apparatus

  4. If the frequency of light in a photo electron experiment is doubled the stopping potential will ______________.

    (a)

    be doubled

    (b)

    be halved

    (c)

    become more than double

    (d)

    become less than double.

  5. Light of wavelength falls on a metal having work function \(\frac { { h }_{ c } }{ { \lambda }_{ 0 } } \). Photo electric effect will place only if __________.

    (a)

    λ ≥ λ0

    (b)

    λ ≥ 2λ0

    (c)

    λ ≤ λ0

    (d)

    λ < λ0/2

  6. When the intensity of a light source is increased?

    (a)

    the number of photons emitted by the source in unit time increases

    (b)

    more energetic photons are emitted

    (c)

    faster photons are emitted

    (d)

    total energy of the photons emitted per unit time decreases.

  7. Photo electron effect supports quantum nature of light because ___________.

    (a)

    there is a minimum frequency which no photo electrons are emitted

    (b)

    the maximum kinetic energy of photo electrons depends only one the frequency of light and not in intensity

    (c)

    even when the metal surface is faintly illuminated the photoelectrons leave the surface immedietly

    (d)

    All the above

  8. A photon of energy hv is absorbed by a free electrons of a metal having work function ф < hv _____________.

    (a)

    The electron is sure to come out

    (b)

    The electron is sure to come out with a kinetic energy ф < hv

    (c)

    Either the electron does not come out or it comes out with kinetic energy hv - ф

    (d)

    It may come out with a kinetic energy less than hv - ф

  9. If the wavelength of light in an except on photoelectric effect is doubled ________________.

    (a)

    the photoelectric emission will not take place

    (b)

    the photoelectric emission may not take place

    (c)

    the stopping potential will increase

    (d)

    the stopping potential will decrease

  10. The photo current in an experiment on photoelectric effect increases if ____________.

    (a)

    the intensity of the source is increased

    (b)

    the exposure time is increased

    (c)

    the intensity of the source is decreased

    (d)

    the exposure time is decreased

  11. The anode plate in an experiment on photoelectric effect is kept vertically above the emitter plate. Light source is put on. An electric field is switched on which has vertically downward direction.

    (a)

    The photo current will increase

    (b)

    The kinetic energy of the electrons will increase

    (c)

    The stopping potential will decrease

    (d)

    The transhold wavelength will increase

  12. According to Einstein's photoelectric equation the plot of the K.E of the emitted photoelectrons from a metal vs the frequency of incident radiation gives a straight line where slope ____________.

    (a)

    depends on the nature of the metal used

    (b)

    depends on the intensity of the radiation

    (c)

    both a & b

    (d)

    Depends on neither a or b

  13. A charged oil drop is suspended in a uniform field of 3 x 104 Vm-1 so that it neither falls nor rises. The charge on the drop will be _____________.

    (a)

    3.3 x 10-18C

    (b)

    3.2 x 10-18C

    (c)

    1.6 x 10-18C

    (d)

    4.8 x 10-18C

  14. A photon of frequency v has a momentum associated with it. If c is the velocity of light the momentum is _____________.

    (a)

    \(\frac{v}{c}\)

    (b)

    hvc

    (c)

    \(\frac { hv }{ { c }^{ 2 } } \)

    (d)

    \(\frac { hv }{ c } \)

  15. According to Einstein's photoelectric equation the graph between the K.E of photoelectrons ejected and the frequency of incident radiation is ____________.

    (a)

    (b)

    (c)

    (d)

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