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MCQ On Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter

Questions
1 According to Einstein’s photoelectric equation, the graph of kinetic energy of the photoelectron emitted from the metal versus the frequency of the incident radiation gives a straight line graph, whose slope
A depends on the intensity of the incident radi-ation.
B depends on the nature of the metal and also on the intensity of incident radiation.
C is same for all metals and independent of the intensity of the incident radiation.
D depends on the nature of the metal.

Answer:is same for all metals and independent of the intensity of the incident radiation.
2 In photoelectric effect, the photoelectric current is independent of
A intensity of incident light
B potential difference applied between the two electrodes
C the nature of emitter material
D frequency of incident light

Answer:frequency of incident light
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3 Which of the following statements is correct regarding the photoelectric experiment?
A The photocurrent increases with intensity of light.
B Stopping potential increases with increase in intensity of incident light.
C The photocurrent increases with increase in frequency.
D All of these

Answer:The photocurrent increases with intensity of light.
4 In photoelectric effect, stopping potential depends on
A frequency of incident light
B nature of the emitter material
C intensity of incident light
D both (a) and (b)

Answer:both (a) and (b)
5 A metal surface ejects electrons when hit by green light but nothing when hit by yellow light. The electrons will be ejected when the surface is hit by
A blue light
B heat rays
C infrared light
D red light

Answer:blue light
6 The maximum value of photoelectric current is called
A base current
B saturation current
C collector current
D emitter current

Answer:saturation current
7 The phenomenon of photoelectric emission was discovered in 1887 by
A Albert Einstein
B Heinrich Hertz
C Wilhelm Hallwachs
D Philipp Lenard

Answer:Heinrich Hertz
8 In photoelectric effect, the photocurrent
A depends both on intensity and frequency of the incident light.
B does not depend on the frequency of incident light but depends on the intensity of the inci-dent light.
C decreases with increase in frequency of inci-dent light.
D increases with increase in frequency of inci-dent light.

Answer:does not depend on the frequency of incident light but depends on the intensity of the inci-dent light.
9 Which phenomenon best supports the theory that matter has a wave nature?
A Electron momentum
B Electron diffraction
C Photon momentum
D Photon diffraction

Answer:Electron diffraction
10 The minimum energy required for the electron emission from the metal surface can be supplied to the free electrons by which of the following physical processes?
A Thermionic emission
B Field emission
C Photoelectric emission
D All of these

Answer:All of these
11 Cathode rays were discovered by
A Maxwell Clerk James
B Heinrich Hertz
C William Crookes
D J.J. Thomson

Answer:William Crookes
12 The figure shows stopping V0A potential V0 and frequency o for two different metallic surfaces A and B. The work function of A, as compared to that of B is

Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter

A less
B more
C equal
D nothing can be said

Answer:less
13 Who established that electric charge is quantised?
A J.J. Thomson
B William Crookes
C R.A. Millikan
D Wilhelm Rontgen

Answer:R.A. Millikan
14 What is the de-Broglie wavelength of an electron accelerated from rest through a potential difference of 100 volts?
A 12.3 Å
B 1.23 Å
C 0.123 Å
D None of these

Answer:1.23 Å
15 Compared to liquids and solids, gases are:
A good conductors of electricity
B best conductors of electricity
C very poor conductors of electricity
D good or bad conductors of electricity depending upon the nature of the gas

Answer:very poor conductors of electricity
16 which Characteristic of a target does the Mosley’s law relate the frequency of X-rays?
A density
B atomic number
C atomic weight
D interatomic space

Answer:atomic number
17 The de-Broglie wavelength of particle of mass 1 mg moving with a velocity of 1 ms-1, in terms of Planck’s constant h, is given by (in metre):
A 105 h
B 106 h
C 10-3 h
D 103 h

Answer:106 h
18 Which of the following radiations cannot eject photo electrons?
A ultraviolet
B infrared
C visible
D X-rays

Answer:infrared
19 When a yellow light is incident on a surface, no electrons are emitted while green light can emit electrons. If the red light is incident on the surface then:
A no electrons are emitted
B photons are emitted
C electrons of higher energy are emitted
D electrons of lower energy are emitted

Answer:no electrons are emitted
20 Evidence of the wave nature of light cannot be obtained from:
A diffraction
B interference
C doppler effect
D reflection

Answer:reflection

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