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NCERT Solutions for class 12 Physics | Chapter 11 - Dual Nature of Radiation and Matter

Free download in PDF Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter Multiple Choice Questions and Answers for Board, JEE, NEET, AIIMS, JIPMER, IIT-JEE, AIEE and other competitive exams. MCQ Questions for Class 12 Physics with Answers were prepared based on the latest exam pattern. These short solved questions or quizzes are provided by Gkseries. These will help the students for preparation of their examination./p>

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(1) In photo electric emission, for alkali metals the threshold frequency lies in the:
[A] visible region
[B] ultraviolet region
[C] infrared region
[D] far end of the infrared region
Answer: visible region
(2) The charge of a photo electron is :
[A] 9.1 × 10-31 C
[B] 9.1 × 10-27 C
[C] 9.1 × 10-24 C
[D] none of these
Answer: none of these
(3) What is the de-Broglie wavelength of an electron accelerated from rest through a potential difference of V volts?
[A] Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter
[B] Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter
[C] Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter
[D] None of these
Answer: A
(4) X-rays are:
[A] deflected by an electric field
[B] deflected by a magnetic field
[C] deflected by both electric and magnetic fields
[D] not deflected by electric and magnetic fields
Answer: not deflected by electric and magnetic fields
(5) The work function of photoelectric material is 3.3 eV. The threshold frequency will be equal to:
[A] 8 × 1014 Hz
[B] 8 × 1010 Hz
[C] 5 × 1010 Hz
[D] 4 × 1014 Hz
Answer: 8 × 1014 Hz
(6) The ratio of specific charge of an alpha particle to the proton is:
[A] 1 : 2
[B] 2 : 1
[C] 4 : 1
[D] 1 : 4
Answer: 1 : 2
(7) Protons and alpha particles have the same de-Broglie wavelength. What is same for both of them ?
[A] Energy
[B] Time period
[C] Frequency
[D] Momentum
Answer: Momentum
(8) Millikan’s oil drop experiment makes use of:
[A] Stokes’ law
[B] Boyle’s law
[C] Gas equation
[D] Bernoulli’s theorem
Answer: Stokes’ law
(9) The number of photons of frequency n present in energy E, in terms of Planck’s constant h:
[A] E/nh
[B] nhE
[C] nh/E
[D] nE/h
Answer: E/nh
(10) Name the scientists who first studied the passage of electricity through fluids to establish the electrical nature of matter:
[A] Millikan
[B] Planck
[C] Faraday
[D] Boyle
Answer: Faraday
(11) The different stages of discharge in a discharge tube can be explained on the basis of:
[A] the wave nature of light
[B] the dual nature of light
[C] wave nature of electrons
[D] the collision between the charged particles emitted from the cathode the atoms of the gas in the tube
Answer: the collision between the charged particles emitted from the cathode the atoms of the gas in the tube
(12) The momentum of an electron that emits a wavelength of 2 Å. will be:
[A] 6.4 × 10-36 kgms-1
[B] 3.3 × 10-24 kgms-1
[C] 3.3 × 10-34 kgms-1

[D] none of these
Answer: 3.3 × 10-24 kgms-1
(13) In Thomson’s experiment number of parabola gives :
[A] the no. of electrons present in element
[B] the no. of proton present in element
[C] the no. of neutrons present in element
[D] the no. of isotopes of the element present
Answer: the no. of isotopes of the element present
(14) De-Broglie equation states the:
[A] dual nature
[B] particle nature
[C] wave nature
[D] None of these
Answer: dual nature
(15) The strength of photoelectric current depends upon :
[A] angle of incident radiation
[B] frequency of incident radiation
[C] intensity of incident radiation
[D] distance between anode and cathode
Answer: frequency of incident radiation
(16) What is the de-Broglie wavelength of a proton accelerated from rest through a potential difference of V volts?
[A]
[B]
[C]
[D] None of these
Answer: None of these
(17) In Davisson – Germer experiment, if the angle of diffraction is 52o, then the glancing angle will be:
[A] 32°
[B] 64°
[C] 72°
[D] 92°
Answer: 64°
(18) In the Davisson and Germer experiment, the velocity of electrons emitted from the electron gun can be increased by
[A] increasing the potential different between the anode and filament
[B] increasing the filament current
[C] decreasing the filament current
[D] decreasing the potential difference between the anode and filament
Answer: decreasing the potential difference between the anode and filament
(19) The energy of photon is equal to the K.E. of a proton. The energy of the photon is E. Let λ1  be the de- Broglie wavelength of the proton and  be the wavelength of the photon. The ratio λ1/ λ2 is proportional to
[A] Eo
[B] E1/2
[C] E-1
[D] E-1/2
Answer: E1/2
(20) The ratio of momenta of an electron and an alpha particle which are accelerated from rest through a potential different of 100 volt is
[A] 1:1
[B]
[C]
[D]
Answer: D

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