Matter Waves MCQs: Important Questions for ISC Physics Exam Preparation

Matter Waves MCQs: Important Questions for ISC Physics Exam Preparation. These MCQs / Objective Type Questions is based on latest reduced syllabus according 2021-22 session on bifurcated pattern. Main motto of MCQ Type Question is cracking the next upcoming Sem-2 exam of council. Visit official website CISCE for detail information about ISC Class-12 Physics.

Matter Waves MCQs: Important Questions for ISC Class-12 Physics Exam

Matter Waves MCQs Important Questions for ISC Physics

Board ISC
Class 12th (XII)
Subject Physics
Chapter Matter Waves
Syllabus  on bifurcated syllabus (after reduction)
Session 2021-22
Bifurcated Sem-2
Topic MCQs / Objective Type Question

Important MCQs Matter Waves for ISC Class 12

Question 1. The idea of matter waves was given by

(a) Davisson and Germer

(b) de-Broglie

(c) Einstein

(d) Planck

Answer: (b) de-Broglie

Question 2. Wave is associated with matter

(a) When it is stationary

(b) When it is in motion with the velocity of light only

(c) When it is in motion with any velocity

(d) None of the above

Answer: (c) When it is in motion with any velocity

Question 3. The de-Broglie wavelength associated with the particle of mass m moving with velocity v is

(a) h/mv

(b) mv/h

(c) mh/v

(d) m/hv

Answer: (a) h/mv

Question 4. A photon, an electron, and a uranium nucleus all have the same wavelength. The one with the most energy:

(a) Is the photon

(b) Is the electron

(c) Is the uranium nucleus

(d) Depends upon the wavelength and the properties of the particle

Answer: (a) Is the photon

Question 5. A particle which has zero rest mass and non-zero energy and momentum must travel with a speed:

(a) Equal to c, the speed of light in vacuum

(b) Greater than c

(c) Less than c

(d) Tending to infinity

Answer: (a) Equal to c, the speed of light in vacuum

Question 6. If the de-Broglie wavelengths for a proton and for a α-particle are equal, then the ratio of their velocities will be

(a) 4 : 1

(b) 2 : 1

(c) 1 : 2

(d) 1 : 4

Answer: (a) 4 : 1 

Question 7. Dual nature of radiation is shown by:

(a) Diffraction and reflection

(b) Refraction and diffraction

(c) Photoelectric effect alone

(d) Photoelectric effect and diffraction

Answer: (d) Photoelectric effect and diffraction

Question 8. If particles are moving with same velocity, then maximum de-Broglie wavelength will be for

(a) Neutron

(b) Proton

(c) β-particle

(d) -particle

Answer: (c) β-particle             

Question 9. Particle nature and wave nature of electromagnetic waves and electrons can be shown by

(a) Electron has small mass, deflected by the metal sheet

(b) X-ray is diffracted, reflected by thick metal sheet

(c) Light is refracted and defracted

(d) Photoelectricity and electron microscopy

Answer: (d) Photoelectricity and electron microscopy

Question 10.The de-Broglie wavelength associated with a hydrogen molecule moving with a thermal velocity of 3 km/s will be

(a) 1 Å

(b) 0.66 Å

(c) 6.6 Å

(d) 66 Å

Answer: (b) 0.66 Å

Question 11. An electron and proton have the same de-Broglie wavelength. Then the kinetic energy of the electron is

(a) Zero

(b) Infinity

(c) Equal to the kinetic energy of the proton

(d) Greater than the kinetic energy of the proton

Answer: (d) Greater than the kinetic energy of the proton

Question 12. The kinetic energy of an electron with de-Broglie wavelength of 0.3 nanometer is

(a) 0.168 eV

(b) 16.8 eV

(c) 1.68 eV

(d) 2.5 eV

Answer: (b) 16.8 eV

Question 13. The energy that should be added to an electron to reduce its de Broglie wavelength from one nm to 0.5 nm is

(a) Four times the initial energy

(b) Equal to the initial energy

(c) Twice the initial energy

(d) Thrice the initial energy

Answer: (d) Thrice the initial energy

Question 14. The energy of a photon of wavelength λ is given by

(a) hλ

(b) chλ

(c) λ /hc

(d)  hc/λ

Answer: (d)  hc/λ

Question 15. The momentum of a photon of energy hv will be

(a) hv

(b) hv/c

(c) hvc

(d) h/v

Answer: (b) hv/c

Question 16. The work function of a metal is 4.2 eV, its threshold wavelength will be:

(a) 4000 Å

(b) 3500 Å

(c) 2955 Å

(d) 2500 Å

Answer: (c) 2955 Å

Question 17. The stopping potential is directly related to

(a) the work function of the metal
(b) intensity of incident radiation
(c) the saturation current for the given frequency
(d) the kinetic energy gained by the photoelectrons

Answer: (d) the kinetic energy gained by the photoelectrons

Question 18. The wave theory of light does not explain

(a) polarisation
(b) diffraction
(c) photocurrent
(d) interference

Answer: (c) photocurrent

Question 19. Light of frequency 1.9 times the threshold frequency is incident on a photosensitive material. If the frequency is halved and intensity is doubled, the photocurrent becomes

(a) doubled

(b) quadrupled

(c) halved

(d) zero

Answer: (d) zero

Question 20.  For a metal having a work function W0, the threshold wavelength is λ. What is the threshold wavelength for the metal having work function 2W0?

(a) λ/4

(b) λ/2

(c) 2λ

(d) 4λ

Answer: (b) λ/2

Question 21. Calculate the de Broglie wavelength associated with the electron which has a kinetic energy of 5 eV.

(a) 5.47 Å

(b) 2.7 Å

(c) 5.9 Å

(d) None of the above

Answer: (a) 5.47 Å

Question 22. What is the ratio of the de Broglie wavelengths proton and an α particle if they are accelerated by the same potential difference?

(a) 2√2: 1

(b) 3:2

(c) 3√2: 1

(d) 2: 1

Answer: (a) 2√2: 1

Question 23. An electron and proton have the same de-Broglie wavelength. Then the kinetic energy of the electron is

(a) Zero

(b) Infinity

(c) Equal to the kinetic energy of the proton

(d) Greater than the kinetic energy of the proton

Answer: (d) Greater than the kinetic energy of the proton

Question 24.  If the K.E. of an electron, a proton a neutron and an α -particle is identical, the maximum de-Broglie wavelength will be for

(a) Electron

(b) Proton

(c) α -particle

(d) Neutron

Answer: (a) Electron

Question 25.  A particle which has zero rest mass and non-zero energy and momentum must travel with a speed

(a) Equal to c, the speed of light in vacuum

(b) Greater then c

(c) Less then c

(d) Tending to infinity

Answer: (a) Equal to c, the speed of light in vacuum

Question 26. Who among the following established that electric charge is quantised?

(a) R.A. Millikan

(b) Wilhelm Rontgen

(c) William Crookes

(d) J.J. Thomson

Answer: (a) R.A. Millikan

Question 27. What type of nature do electromagnetic waves have?

(a) Dual nature
(b) Wave nature
(c) Particle nature
(d) Photon nature

Answer: (a) Dual nature

Question 28. The magnitude of which of the following is proportional to the frequency of the wave?

(a) Electrons
(b) Neutrons
(c) Photons
(d) Protons

Answer: (c) Photons

Question 29. The sun gives light at the rate of 1500 W/m2 of area perpendicular to the direction of light. Assume the wavelength of light as 5000Å. Calculate the number of photons/s arriving at 1 m2 area at that part of the earth.

(a) 4.770 × 1021
(b) 3.770 × 1011
(c) 3.770 × 1021
(d) 3.770 × 1020

Answer: (c) 3.770 × 1021

Question 30. What is the de – Broglie wavelength associated with an electron, accelerated through a potential difference of 200 volts?

(a) 1 nm
(b) 0.5 nm
(c) 0.0056 nm
(d) 0.086 nm

Answer: (d) 0.086 nm

Question 31. What is the de – Broglie wavelength of a proton accelerated through a potential difference of 2 kV?

(a) 0.65 × 10-13 m
(b) 0.65 × 10-10 m
(c) 0.65 × 10-11 m
(d) 0.65 × 10-20
m

Answer: (b) 0.65 × 10-10 m

Question 32. What is the de – Broglie wavelength of a ball of mass 150 g moving at a speed of 50 m/s?

(a) 8.8 × 10-34 m
(b) 8.8 × 10-30 m
(c) 8.8 × 10-25 m
(d) 8.8 × 10-35
m

Answer: (d) 8.8 × 10-35 m

Question 33. Which of the following effect proves the wave nature of light?

(a) Photoelectric effect

(b) Compton effect

(c) Pair production

(d) Polarization

Answer: (d) Polarization

Question 34. When light is directed at the metal surface, the emitted electrons:

(a) are called photons
(b) have energies that depend upon the intensity of light.
(c) have random energies.
(d) have energies that depend upon the frequency of light.

Answer: (d) have energies that depend upon the frequency of light.

Question 35. The threshold frequency for a certain metal is v0. When light of frequency v = 2v0 is incident on it, the maximum velocity of photo electrons is 4 × 106 ms-1. If the frequency of incident radiation is increased to 5 v0, then the maximum velocity of photo electrons (m/s) is

(a) 8 × 105
(b) 2 × 106
(c) 2 × 107
(d) 8 × 106

Answer: (d) 8 × 106

Question 36. For light of wavelength 5000 Å, the photon energy is nearly 2.5 eV. For X-rays of wavelength 1 Å, the photon energy will be close to:

(a) 2.5 × 5000 eV
(b) 2.5 ÷ 5000 eV
(c) 2.5 × (5000)² eV
(d) 2.5 ÷ (5000)² eV

Answer: (a) 2.5 × 5000 eV

Question 37. When light is incident on a metal surface the maximum kinetic energy of emitted electrons

(a) vary with intensity of light
(b) vary with frequency of light
(c) vary with speed of light
(d) vary irregularly

Answer: (b) vary with frequency of light

Question 38. The mass (m) of two particles X and Y are such that mx > my. If both the particles have the same de Broglie wavelength, then

(a) their energies are not same

(b) their velocities are same

(c) their momenta are same

(d) X has less energy than Y

Answer: (c) their momenta are same

Question 39. 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: (d) the collision between the charged particles emitted from the cathode the atoms of the gas in the tube

Question 40. If the momentum of an electron is changed by δ p, then the de-Broglie wavelength associated with it changes by 0.50%. The initial momentum of the electron will be

(a) δ p /200

(b) δ p /199

(c) 199 δ p

(d) 400 δ p

Answer: (c) 199 δ p

Question 41. The wavelength associated with n electron is 1Å. The potential difference required for accelerating it is

(a) 100 V
(b) 150 V
(c) 250 V
(d) 10³ V

Answer: (b) 150 V

–: End of Matter Waves MCQs  :–

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