Welcome to your Dual Nature of Radiation and Matter MCQs Mock Test of Class 12th Physics
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Question 1. The charge of a photo electron is :
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Question 2. The number of photons of frequency n present in energy E, in terms of Planck’s constant h:
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Question 3. Compared to liquids and solids, gases are:
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Question 4. The different stages of discharge in a discharge tube can be explained on the basis of
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Q.5. Cathode ray consists of
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Q.6. In the photoeletric effect, electrons are emitted
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Q.7. The minimum energy required to eject an electron, from the metal surface is called
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Q.8. The work function for photoelectric effect
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Q.9. A discharge takes place between the two electrodes on applying the electric field to the gas in the discharge tube. The cause of this fluorescence was attributed to
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Q.10. The presently accepted value of charge/mass (e/m) is
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Q.11. In which of the following, emission of electrons does not take place?
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Q.12. Photoelectric emission occurs only when the incident light has more than a certain minimum
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Q.13. Which of the following when falls on a metal will emit photoelectrons ?
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Q.14. 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
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Q.15. The wave nature of light was established by (i) Maxwell’s equations (ii) Fraunhoffer’s lines (iii) Hertz experiment (iv) Einstein’s theory
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Q.16. The work-function of a metal is
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Q.17. The work function of a metal is independent of (i) nature of the surface of the metal (ii) dimensions of the metal (iii) properties of the metal (iv) abundance of the metal
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Q.18. The theory of quantisation of electric charge was given by
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Q.19. In photoelectric effect, electrons are ejected from metals, if the incident light has a certain minimum
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Q.20. Which of the following metals is not sensitive to visible light?
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Q.21. A photosensitive substance emits _____when illuminated by light.
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Q.22. The photoelectric current does not depend upon the (i) frequency of incident light (ii) work function of the metal (iii) stopping potential (iv) intensity of incident light
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Q.23. The stopping potential is directly related to
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Q.24. The wave theory of light does not explain
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Q.25. Photoelectric effect can be explained by
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Q.26. In Einstein’s picture of Photoelectric emission, the photoelectric emission does not take place by
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Q.27. The particle nature of light is not confirmed by
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Q.28. Photons are deflected by
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Q.29. Electrically, photons are
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Q.30. In a photon-particle collision, the quantity that does not remain conserved is
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Q.31. Of the following properties, the photon does not possess
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Q.32. It is essential to consider light as a stream of photons to explain
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Q,33. Photoelectric effect was discovered by
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Q.34. The momentum of a photon of wavelength λ is
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Q.35. The photo-electrons emitted from a metal surface are such that their velocity
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Q.36. Photoelectric effect shows
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Q.37. A photoelectric cell converts
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Question 38. Millikan’s oil drop experiment makes use of:
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Q.39. The photoelectric effect is based on the law of conservation of
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Q.40. The photoelectric effect can be understood on the basis of
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Q.41. When light is incident on a metal surface the maximum kinetic energy of emitted electrons
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Q.42. The maximum energy of electrons released in a photocell is independent of
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Q.43. Einstein’s photoelectric equation states that hν = W0 + Ek. In this equatin, Ek refers to the
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Q.44. Photoelectric effect is the phenomenon in which
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Q.45. A photoelectric cell is a device which
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Q.46. Which of the following shows particle nature of light?
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Question 47. De-Broglie equation states the:
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Question 48. Protons and alpha particles have the same de-Broglie wavelength. What is same for both of them ?
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Question 49. Kinetic energy of emitted electrons depends upon :
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Question 50. De-Broglie wavelength of a body of mass m and kinetic energy E is given by (symbols have their usual meanings):
