Dual Nature of Radiation and Matter MCQ Questions for Class 12 Physics Chapter 11 with Answers

Find here the NCERT chapter-wise Multiple Choice Questions from Class 12 Physics book Chapter 11 Dual Nature of Radiation and Matter with Answers Pdf free download. This may assist you to understand and check your knowledge about the chapters. Students also can take a free test of the Multiple Choice Questions of Dual Nature of Radiation and Matter. Each question has four options followed by the right answer. These MCQ Questions are selected supported by the newest exam pattern as announced by CBSE.


NCERT MCQ Chapters for Class 12 Physics

Q1. Cathode rays were discovered by

(i) Maxwell Clerk James
(ii) Heinrich Hertz
(iii) William Crookes
(iv) J.J. Thomson

(iii) William Crookes


Q2. The ratio of specific charge of an alpha particle to the proton is:

(i) 1 : 2
(ii) 2 : 1
(iii) 4 : 1
(iv) 1 : 4

(i) 1 : 2


Q3. A proton, a neutron, an electron and an a-particle have same energy. Then their de-Broglie wavelengths compare as

(i) λp = λn > λe > λa
(ii) λα < λp = λn > λe
(iii) λe < λp = λn > λa
(iv) λe = λp = λn = λa

(ii) λα λe


Q4. Photoelectric emission occurs only when the incident light has more than a certain minimum

(i) power
(ii) wavelength
(iii) intensity
(iv) frequency

(iv) frequency


Q5. Which of the following are quick electron emissions?

(i) Photoelectric emission
(ii) Field emission
(iii) Secondary emission
(iv) Thermionic emission

(ii) Field emission


Q6. When the speed of electrons increase, then the value of its specific charge

(i) increases
(ii) decreases
(iii) ramains unchanged
(iv) increases upto some velocity

(ii) decreases


Q7. Who established that electric charge is quantised?

(i) J.J. Thomson
(ii) William Crookes
(iii) R.A. Millikan
(iv) Wilhelm Rontgen

(iii) R.A. Millikan


Q8. Kinetic energy of emitted electrons depends upon :

(i) frequency
(ii) intensity
(iii) nature of atmosphere surrounding the electrons
(iv) none of these

(i) frequency


Q9. In which of the following, emission of electrons does not take place?

(i) Thermionic emission
(ii) X-rays emission
(iii) Photoelectric emission
(iv) Secondary emission

(ii) X-rays emission


Q10. Find the wrong statement.

(i) An electron gun is to create electrons and then accelerate them to a very high speed
(ii) Thermionic emissions and photoelectric emissions are the same
(iii) The kinetic energy of photoelectrons vary
(iv) Vacuum tubes are thermionic devices

(ii) Thermionic emissions and photoelectric emissions are the same


Q11. A strong argument for the particle nature of cathode rays is that they

(i) produce fluoroscence
(ii) travel through vacuum
(iii) get deflected by electric and magnetic fields
(iv) cast shadow

(iii) get deflected by electric and magnetic fields


Q12. Which of the following statements is correct regarding the photoelectric experiment?

(i) The photocurrent increases with intensity of light.
(ii) Stopping potential increases with increase in intensity of incident light.
(iii) The photocurrent increases with increase in frequency.
(iv) All of these

(i) The photocurrent increases with intensity of light.


Q13. Electrically, photons are

(i) positively charged
(ii) negatively charged
(iii) neutral
(iv) strongly charged, may be positive or negative

(iii) neutral


Q14. Cathode ray consists of

(i) photons
(ii) electrons
(iii) protons
(iv) α-particles

(ii) electrons


Q15. Who is responsible for the photoelectric effect experiment?

(i) Albert Einstein
(ii) Max Planck
(iii) Heinrich Hertz
(iv) de – Broglie

(iii) Heinrich Hertz


Q16. When light is incident on a metal surface the maximum kinetic energy of emitted electrons

(i) vary with intensity of light
(ii) vary with frequency of light
(iii) vary with speed of light
(iv) vary irregularly

(ii) vary with frequency of light


Q17. The maximum value of photoelectric current is called

(i) base current
(ii) saturation current
(iii) collector current
(iv) emitter current

(ii) saturation current


Q18. The strength of photoelectric current depends upon :

(i) angle of incident radiation
(ii) frequency of incident radiation
(iii) intensity of incident radiation
(iv) distance between anode and cathode

(ii) frequency of incident radiation


Q19. Which of the following when falls on a metal will emit photoelectrons ?

(i) UV radiations
(ii) Infrared radiation
(c ) Radio waves
(iv) Microwaves

(i) UV radiations


Q20. Identify the conclusion of the photoelectric experiment from the following.

(i) Photons are smaller than the electrons
(ii) The energy in light comes as small packets
(iii) The energy in light comes as huge packets of energy
(iv) The energy released by the photoelectric effect is very less

(ii) The energy in light comes as small packets


Q21. The maximum energy of electrons released in a photocell is independent of

(i) the frequency of the incident light
(ii) the intensity of the incident light
(iii) the nature of the cathode
(iv) All of the above

(iii) the nature of the cathode


Q22. In photoelectric effect, the photoelectric current is independent of

(i) intensity of incident light
(ii) potential difference applied between the two electrodes
(iii) the nature of emitter material
(iv) frequency of incident light

(iv) frequency of incident light


Q23. Name the scientists who first studied the passage of electricity through fluids to establish the electrical nature of matter:

(i)Millikan
(ii) Planck
(iii) Faraday
(iv) Boyle

(iii) Faraday


Q24. Particle like behavior of light arises from the fact that each quanta of light has definite …X… and a fixed value of …Y.. just like a particle, Here, X and Y refer to

(i) frequency, energy
(ii) shape, volume
(iii) energy, frequency
(iv) energy, momentum

(iv) energy, momentum


Q25. Which theory of light explains the photoelectric effect?

(i) Electromagnetic theory
(ii) Magnetic theory
(iii) Electric theory
(iv) Wave theory

(i) Electromagnetic theory


Q26. Which of the following metals is not sensitive to visible light?

(i) Caesium
(ii) Sodium
(iii) Rubidium
(iv) Cadmium

(iv) Cadmium


Q27. In photoelectric effect, stopping potential depends on

(i) frequency of incident light
(ii) nature of the emitter material
(iii) intensity of incident light
(iv) both (i) and (ii)

(iv) both (i) and (ii)


Q28. Millikan’s oil drop experiment makes use of:

(i) Stokes’ law
(ii) Boyle’s law
(iii) Gas equation
(iv) Bernoulli’s theorem

(i) Stokes’ law


Q29. Which of the following metals is not sensitive to visible light?

(i) Caesium
(ii) Sodium
(iii) Rubidium
(iv) Cadmium

(iv) Cadmium


Q30. Which theory of light is wave theory or particle theory?

(i) Dynamic physics
(ii) Static physics
(iii) Quantum mechanics
(iv) de – Broglie hypothesis

(iii) Quantum mechanics


Q31. The wave theory of light does not explain

(i) polarisation
(ii) diffraction
(iii) photocurrent
(iv) interference

(iii) photocurrent


Q32. Which phenomenon best supports the theory that matter has a wave nature?

(i) Electron momentum
(ii) Electron diffraction
(iii) Photon momentum
(iv) Photon diffraction

(ii) Electron diffraction


Q33.X-rays are:

(i) deflected by an electric field
(ii) deflected by a magnetic field
(iii) deflected by both electric and magnetic fields
(iv) not deflected by electric and magnetic fields

(iv) not deflected by electric and magnetic fields


(i) the work function of the metal
(ii) intensity of incident radiation
(iii) the saturation current for the given frequency
(iv) the kinetic energy gained by the photoelectrons

(iv) the kinetic energy gained by the photoelectrons


Q35. Which principle suggests that the intensity of light determines its amplitude?

(i) Huygens principle
(ii) Classic wave theory
(iii) de – Broglie hypothesis
(iv) Einstein’s particle theory

(ii) Classic wave theory


Q36. In a photon-particle collision, the quantity that does not remain conserved is

(i) total energy
(ii) total momentum
(iii) number of photons
(iv) None of these

(iii) number of photon


Q37. Which of the following radiations cannot eject photo electrons?

(i) ultraviolet
(ii) infrared
(iii) visible
(iv) X-rays

(ii) infrared


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