XII Physics Advent of Modern Physics Online Test Mdcat-2024

1. In the photoelectric effect if the intensity of light is doubled then the maximum kinetic energy of photoelectrons will become?

2. In Compton scattering, the change in the wavelength is given by:

3. The work functions of two different metals "N" and "O" are 3.2 eV and 1.6 eV respectively. If the threshold wavelength of "O" is 750 nm, then the threshold wavelength of metal "N" is:

4. The idea of the matter wave was given by:

5. Photon A has half the energy of photon B. The ratio of the momentum of B to that of A is:

6. The slope of the graph between the maximum kinetic energy of photoelectrons and frequency of incident light is equal to:

7. The speed of an X-ray photon is:

8. Light of frequency 2 times the threshold frequency is incident on the metal surface. If the frequency is quartered and the intensity is doubled, the photoelectric effect becomes:

9. The photoelectric threshold frequency of a metal is f° When light of frequency 4f° is incident on the metal, the maximum kinetic energy of the emitted photoelectron is:

10. The process of scattering of an X-ray photon by an electron is called:

11. Amount of kinetic energy of emitted photoelectrons depends upon:

12. Phenomenon in which electric charges (electrons) are emitted from hot bodies is known as:

13. The materialization of energy takes place in the process:

14. Disintegration of a photon on striking a nucleus into an electron and positron is known as:

15. The relation of the uncertainty principle between position and momentum is given by:

16. The rest mass energy of an electron is:

17. The reverse process of pair production is called:

18. The relation, hf = 2m°c² + KEe- + KEe+, holds a:

19. Radiations are always emitted or absorbed in the form of packets of energy. This is the statement of:

20. A single quantum of electromagnetic radiation is:

21. As the temperature of a black body is raised, the wavelength corresponding to maximum intensity:

22. If rest mass of a particle is m_o and relativistic mass is m, then its kinetic energy (K.E) is:

23. One kilogram mass will be equivalent to the energy:

24. If a material object moves with the speed of light, its mass becomes:

25. An ideal black body is:

26. A black body can be made by:

27. In the photoelectric effect when monochromatic light is allowed to shine on cathode, it begins to:

28. The work function of a metal is 6.63 eV. Its threshold frequency is:

29. The momentum of a photon is 3.3 × 10^-29 kgm/s. Its frequency will be:

30. De-Broglie wavelength associated with an electron at a speed of 10⁶ m/s:

31. Ultraviolet radiation of 6.2 eV falls on an aluminum surface having work function φ=4.2 eV. The kinetic energy of the fastest electron emitted is:

32. The relation between energy "E" and momentum "P" for a photon is:

33. The dual nature of radiation is shown by:

34. Of the following moving with the same momentum, the one which has the largest wavelength is:

- a. Electron

35. The electrons behave as waves because they can be:

36. De-Broglie waves are associated with:

37. What will be the de-Broglie wavelength when the kinetic energy of the electron increases by 5 times?

38. Work function depends on:

39. Minimum energy required for pair production is:

40. Minimum energy required for pair production is:

41. Wave nature of light is proved by:

42. According to the special theory of relativity, the relation between rest mass and moving mass is given by (Lorentz factor=r):

43. The mass of an object will be doubled at speed:

44. Which one of the following physical quantities changes with relativistic speed:

45. According to Einstein’s theory of relativity:

46. The classical physics is based upon the laws of:

47. Light was considered as an electromagnetic wave by the scientist:

48. A set of coordinate axes with respect to which measurements are made is called:

49. An inertial frame of reference is that one:

50. Modern physics came into existence due to: