# 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.

## Q1. Cathode rays were discovered by

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

(iii) William Crookes

(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

(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

(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

(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 :

(iv) distance between anode and cathode

(iv) Microwaves

## 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

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

## 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

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

## 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

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

## 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
(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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