The document contains multiple choice questions and answers related to topics in physics such as photoelectric effect, electromagnetic radiation, semiconductors, quantum mechanics, atomic structure, nuclear physics, and more. Each question is followed by 4 answer options with one answer marked as correct.

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18. A
C
D
B
26 March -
shift 1, 2021
Phase
Intensity
Amplitude
Frequency
The stopping potential in the context of photoelectric effect
depends on the following property of incident electromagnetic
radiation:

19. A
C
D
B
26 March -
shift 1, 2021
Phase
Intensity
Amplitude
Frequency
The stopping potential in the context of photoelectric effect
depends on the following property of incident electromagnetic
radiation:

20. 25 July - shift 1
2022
The energy band gap of semiconducting material to produce violet
(wavelength = 4000 Å) LED is _____ eV. (Round off to the nearest
integer).

22. 25 July - shift 1
2022
The energy band gap of semiconducting material to produce violet
(wavelength = 4000 Å) LED is _3_ eV. (Round off to the nearest
integer).

23. A
C
D
B
27 Aug -
Shift 1, 2021
Increases the number of photons incident and also
increases the K.E. of the ejected electrons
Increases the frequency of photons incident and
increases the K.E. of the ejected electrons
Increases the frequency of photons incident and the
K.E. of the ejected electrons remains unchanged
Increases the number of photons incident and the
K.E. of the ejected electrons remains unchanged
In a photoelectric experiment, increasing the intensity of incident
light:

24. A
C
D
B
27 Aug -
Shift 1, 2021
Increases the number of photons incident and also
increases the K.E. of the ejected electrons
Increases the frequency of photons incident and
increases the K.E. of the ejected electrons
Increases the frequency of photons incident and the
K.E. of the ejected electrons remains unchanged
Increases the number of photons incident and the
K.E. of the ejected electrons remains unchanged
In a photoelectric experiment, increasing the intensity of incident
light:

25. A
C
D
B
25 July - shift 1
2022
1.537 eV
A metal exposed to light of wavelength 800 nm and emits
photoelectrons with a certain kinetic energy. The maximum kinetic
energy of photoelectron doubles when light of wavelength 500 nm is
used. The work function of the metal (Take hc = 1230 eV-nm).
2.46 eV
0.615 eV
1.23 eV

27. A
C
D
B
25 July - shift 1
2022
1.537 eV
A metal exposed to light of wavelength 800 nm and emits
photoelectrons with a certain kinetic energy. The maximum kinetic
energy of photoelectron doubles when light of wavelength 500 nm is
used. The work function of the metal (Take hc = 1230 eV-nm).
2.46 eV
0.615 eV
1.23 eV

28. 20 July -
Shift 2, 2021
A certain metallic surface is illuminated by monochromatic radiation
of wavelength λ. The stopping potential for photoelectric current for
this radiation is 3 V0. If the same surface is illuminated with a
radiation of wavelength 2λ, the stopping potential is V0. The
threshold wavelength of this surface for photoelectric effect is___ λ

30. 20 July -
Shift 2, 2021
A certain metallic surface is illuminated by monochromatic radiation
of wavelength λ. The stopping potential for photoelectric current for
this radiation is 3 V0. If the same surface is illuminated with a
radiation of wavelength 2λ, the stopping potential is V0. The
threshold wavelength of this surface for photoelectric effect is_4_ λ

31. A
C
D
B
24 June - shift 2
2022
1 : 1
2 : 1
4 : 1
1 : 4
The light of two different frequencies whose photons have energies
3.8 eV and 1.4 eV respectively, illuminate a metallic surface whose
work function is 0.6 eV successively. The ratio of maximum speeds
of emitted electrons for the two frequencies respectively will be:

33. A
C
D
B
24 June - shift 2
2022
1 : 1
2 : 1
4 : 1
1 : 4
The light of two different frequencies whose photons have energies
3.8 eV and 1.4 eV respectively, illuminate a metallic surface whose
work function is 0.6 eV successively. The ratio of maximum speeds
of emitted electrons for the two frequencies respectively will be:

34. A
C
D
B
28 July - shift 2
2022
1 : 2
Two streams of photons, possessing energies, five and ten times the
work function of metal are incident on the metal surface
successively. The ratio of the maximum velocities of the
photoelectron emitted, in the two cases respectively, will be
1 : 3
2 : 3
3 : 2

36. A
C
D
B
28 July - shift 2
2022
1 : 2
Two streams of photons, possessing energies, five and ten times the
work function of metal are incident on the metal surface
successively. The ratio of the maximum velocities of the
photoelectron emitted, in the two cases respectively, will be
1 : 3
2 : 3
3 : 2

37. 26 Feb - shift 2
2021
Two stream of photons, possessing energies equal to twice and ten
times the work function of metal are incident on the metal surface
successively. The value of ratio of maximum velocities of the
photoelectrons emitted in the two respective cases is x : y. The value
of x is

39. 26 Feb - shift 2
2021
Two stream of photons, possessing energies equal to twice and ten
times the work function of metal are incident on the metal surface
successively. The value of ratio of maximum velocities of the
photoelectrons emitted in the two respective cases is x : y. The value
of x is_1_

40. A
C
D
B
29 June - shift 2
2022
1.90 eV
The electric field at the point associated with a light wave is given by
E = 200 [sin(6 × 1015] t + sin(9 × 1015) t] Vm-1
Given: h = 4.14 × 10-15 eVs
If this light falls on a metal surface having a work function of 2.50 eV,
the maximum kinetic energy of the photoelectrons will be:
3.27 eV
3.60 eV
3.42 eV

42. A
C
D
B
29 June - shift 2
2022
1.90 eV
The electric field at the point associated with a light wave is given by
E = 200 [sin(6 × 1015] t + sin(9 × 1015) t] Vm-1
Given: h = 4.14 × 10-15 eVs
If this light falls on a metal surface having a work function of 2.50 eV,
the maximum kinetic energy of the photoelectrons will be:
3,27 eV
3.60 eV
3.42 eV

43. A
C
D
B
28 June - shift 2
2022
Let K1 and K2 be the maximum kinetic energies of photoelectrons
emitted when two monochromatic beams of wavelength 𝜆1 and 𝜆2,
respectively are incident on a metallic surface. If 𝜆1 = 3𝜆2 then:

45. A
C
D
B
28 June - shift 2
2022
Let K1 and K2 be the maximum kinetic energies of photoelectrons
emitted when two monochromatic beams of wavelength 𝜆1 and 𝜆2,
respectively are incident on a metallic surface. If 𝜆1 = 3𝜆2 then:

48. A
C
D
B
28 July - shift 1
2022
The equation can be used to find the de-Broglie
wavelength of an electron. In this equation x stands for:
Where
m = mass of electron
P = momentum of electron
K = Kinetic energy of electron
V = Accelerating potential in volts for electron

50. A
C
D
B
28 July - shift 1
2022
The equation can be used to find the de-Broglie
wavelength of an electron. In this equation x stands for:
Where
m = mass of electron
P = momentum of electron
K = Kinetic energy of electron
V = Accelerating potential in volts for electron

51. A
C
D
B
25 July - shift 2
2022
1 : 1
The ratio of wavelengths of proton and deuteron accelerated by
potential Vp and Vd is Then, the ratio of Vp to Vd will be
2 : 1
4 : 1

53. A
C
D
B
25 July - shift 2
2022
1 : 1
The ratio of wavelengths of proton and deuteron accelerated by
potential Vp and Vd is Then, the ratio of Vp to Vd will be
2 : 1
4 : 1

54. A
C
D
B
29 July - shift 2
2022
An α particle and a proton are accelerated from rest through the
same potential difference. The ratio of linear momenta acquired by
above two particles will be:
8 : 1

56. A
C
D
B
29 July - shift 2
2022
An α particle and a proton are accelerated from rest through the
same potential difference. The ratio of linear momenta acquired by
above two particles will be:
8 : 1

57. A
C
D
B
28 June - shift 1
2022
𝜆p ∝ 𝜆e
2
The de-Broglie wavelength for an electron and a photon are 𝜆e and 𝜆p
respectively. For the same kinetic energy of electron and photon
which of the following presents the correct relation between the de-
Broglie wavelengths of two?
𝜆p ∝ 𝜆e

59. A
C
D
B
28 June - shift 1
2022
𝜆p ∝ 𝜆e
2
The de-Broglie wavelength for an electron and a photon are 𝜆e and 𝜆p
respectively. For the same kinetic energy of electron and photon
which of the following presents the correct relation between the de-
Broglie wavelengths of two?
𝜆p ∝ 𝜆e

60. A
C
D
B
26 June - shift 1
2022
An electron with speed v and a photon with speed c have the same
de-Broglie wavelength. If the kinetic energy and momentum of
electron are Ee and pe and that of photon are Eph and pph respectively.
Which of the following is correct?

62. A
C
D
B
26 June - shift 1
2022
An electron with speed v and a photon with speed c have the same
de-Broglie wavelength. If the kinetic energy and momentum of
electron are Ee and pe and that of photon are Eph and pph respectively.
Which of the following is correct?

63. A
C
D
B
25 June - shift 2
2022
𝜆p = 𝜆n > 𝜆e > 𝜆α
A proton, a neutron, an electron and an α-particle have same energy.
If 𝜆p, 𝜆n, 𝜆e and 𝜆α are the de-Broglie’s wavelength of proton, neutron,
electron and α particle respectively, then choose the correct relation
from the following:
𝜆α < 𝜆n < 𝜆p < 𝜆e
𝜆e < 𝜆p = 𝜆n > 𝜆α
𝜆e = 𝜆p = 𝜆n = 𝜆α

65. A
C
D
B
25 June - shift 2
2022
𝜆p = 𝜆n > 𝜆e > 𝜆α
A proton, a neutron, an electron and an α-particle have same energy.
If 𝜆p, 𝜆n, 𝜆e and 𝜆α are the de-Broglie’s wavelength of proton, neutron,
electron and α particle respectively, then choose the correct relation
from the following:
𝜆α < 𝜆n < 𝜆p < 𝜆e
𝜆e < 𝜆p = 𝜆n > 𝜆α
𝜆e = 𝜆p = 𝜆n = 𝜆α

66. A
C
D
B
27 June - shift 1
2022
𝜆0
An electron (mass m) with an initial velocity
is moving in an electric field where E0 is constant. If at
t = 0 de Broglie wavelength is then its de Broglie
wavelength after time t is given by
𝜆0t

68. A
C
D
B
27 June - shift 1
2022
𝜆0
𝜆0t
An electron (mass m) with an initial velocity
is moving in an electric field where E0 is constant. If at
t = 0 de Broglie wavelength is then its de Broglie
wavelength after time t is given by

76. 29 June - shift 1
2022
are the impact parameters corresponding to
scattering angles 60° and 90° respectively, when an α particle is
approaching a gold nucleus. For d1 = xd2, the value of x will be _____ .

77. 29 June - shift 1
2022
are the impact parameters corresponding to
scattering angles 60° and 90° respectively, when an α particle is
approaching a gold nucleus. For d1 = xd2, the value of x will be _3__ .

78. A
C
D
B
25 July - shift 1
2022
The momentum of an electron revolving in nth orbit is given by:
(Symbols have their usual meanings)

80. A
C
D
B
25 July - shift 1
2022
The momentum of an electron revolving in nth orbit is given by:
(Symbols have their usual meanings)

81. A
C
D
B
25 July - shift 2
2022
Hydrogen atom from excited state comes to the ground by emitting a
photon of wavelength 𝜆. The value of principal quantum number ‘n’ of
the excited state will be:
(R : Rydberg constant)

83. A
C
D
B
25 July - shift 2
2022
Hydrogen atom from excited state comes to the ground by emitting a
photon of wavelength 𝜆. The value of principal quantum number ‘n’ of
the excited state will be:
(R : Rydberg constant)

84. 25 July - shift 2
2022
is the ratio of energies of photons produced due to transition
of an electron of hydrogen atom from its
(i) Third permitted energy level to the second level and
(ii) the highest permitted energy level to the second permitted level.
The value of x will be

86. 25 July - shift 2
2022
is the ratio of energies of photons produced due to transition
of an electron of hydrogen atom from its
(i) Third permitted energy level to the second level and
(ii) the highest permitted energy level to the second permitted level.
The value of x will be _5_

87. 26 July - shift 1
2022
In a hydrogen spectrum, 𝜆 be the wavelength of first transition line of
Lyman series. The wavelength difference will be “a𝜆” between the
wavelength of 3rd transition line of Paschen series and that of 2nd
transition line of Balmer Series where a = ___

89. 26 July - shift 1
2022
In a hydrogen spectrum, 𝜆 be the wavelength of first transition line of
Lyman series. The wavelength difference will be “a𝜆” between the
wavelength of 3rd transition line of Paschen series and that of 2nd
transition line of Balmer Series where a = _5_

102. A
C
D
B
26 June - shift 2
2022
4 : 3
Mass numbers of two nuclei are in the ratio of 4 : 3. Their nuclear
densities will be in the ratio of
1 : 1

103. A
C
D
B
26 June - shift 2
2022
4 : 3
Mass numbers of two nuclei are in the ratio of 4 : 3. Their nuclear
densities will be in the ratio of
1 : 1

104. A
C
D
B
27 July - shift 1
2022
9.5 tears
What is the half-life period of a radioactive material if its activity
drops to 1/16th of its initial value in 30 years ?
8.5 years
7.5 years
10.5 years

106. A
C
D
B
27 July - shift 1
2022
9.5 tears
What is the half-life period of a radioactive material if its activity
drops to 1/16th of its initial value in 30 years ?
8.5 years
7.5 years
10.5 years

107. A
C
D
B
28 July - shift 1
2022
120 days
The half life period of a radioactive substance is 60 days. The time
taken for ⅞ th of its original mass to disintegrate will be:
130 days
180 days
20 days

109. A
C
D
B
28 July - shift 1
2022
120 days
The half life period of a radioactive substance is 60 days. The time
taken for ⅞ th of its original mass to disintegrate will be:
130 days
180 days
20 days

110. 28 July - shift 1
2022
A freshly prepared radioactive source of half life 2 hours 30 minutes
emits radiation which is 64 times the permissible safe level. The
minimum time, after which it would be possible to work safely with
source, will be ______ hours.

112. 28 July - shift 1
2022
A freshly prepared radioactive source of half life 2 hours 30 minutes
emits radiation which is 64 times the permissible safe level. The
minimum time, after which it would be possible to work safely with
source, will be _15_ hours.

113. A
C
D
B
26 June - shift 2
2022
3.75 hours
A radioactive nucleus can decay by two different processes. Half-life
for the first process is 3.0 hours while it is 4.5 hours for the second
process. The effective half-life of the nucleus will be:
0.56 hours
0.26 hours
1.80 hours

115. A
C
D
B
26 June - shift 2
2022
3.75 hours
A radioactive nucleus can decay by two different processes. Half-life
for the first process is 3.0 hours while it is 4.5 hours for the second
process. The effective half-life of the nucleus will be:
0.56 hours
0.26 hours
1.80 hours

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