XII Physics Atomic Spectra and Nuclear Radiations Online test Mdcat-2024

1. Photons of the highest frequency will be absorbed when the transition takes place from

2. Ground state energy of the 4th orbit in a H-atom is

3. Hydrogen atom does not emit X-rays because

4. The correct order of Bohr radius is

5. The energy of an electron in a hydrogenic atom with nuclear charge Z varies as

6. According to classical theory, the proposed circular path of an electron in Rutherford's model of the atom will be

7. Electrons in the atom are held in the atom due to

8. Potential energy of an electron in nth orbit is given as:

9. Estimation and detection of elements in any mixture by subjecting thermal neutrons is known as:

10. Half-life of C¹⁴ isotope of carbon is:

11. Rays which are used for holographic functions:

12. Gamma rays are typically made up of:

13. Isotope used for the treatment of thyroid cancer:

14. Lung cancer is mainly treated with a radioactive isotope:

15. Rate of blood flow in our body is traced by isotopes of:

16. The effect of open radiation is that they produce:

17. When a red-hot tube is supplied with voltage, it emits ____ and the phenomenon is called ____.

18. When gamma rays come in contact with matter and lose some part of its energy, it is known as:

19. Very energetic alpha particles are emitted by:

20. Gamma rays are made up of:

21. Mass of protons as compared to alpha particles is:

22. Velocity with which alpha particles shoot out from a nucleus:

23. Originally, beta particles are made up of:

24. The radius of the 1st orbit of a hydrogen atom is 0.53 Å, then the radius of the fifth state of the hydrogen atom is:

25. The amount of energy needed to transfer an electron from the first orbit to the third orbit is:

26. The ratio of radii of the first three Bohr orbits is:

27. The value of the third ground state energy “E3” is given as:

28. When an electron in a hydrogen atom jumps from a higher orbit into the third orbit, the set of lines emitted is called:

29. Whenever a hydrogen atom emits a photon in the Balmer series:

30. When an electron makes a transition from the ground state to an excitation state then

31. The radius of the second orbit of a hydrogen atom is R, the radius of the third orbit will be:

32. The electron of hydrogen atoms is in the 3rd orbit, then how many different series it can emit:

33. Balmer series lies in:

34. Production of x-rays is a reverse phenomenon of:

35. The first ground state energy “E1” is given as _______:

36. If an electron moves about its own orbits then its total energy:

37. Lyman series lies in _______:

38. Which of the following is correct about x-rays?

I) Energy range of x-rays lie between 1 to 100 KeV

II) Wavelength of x-rays lie between 1nm to 10nm

III) X-rays are produced when electrons accelerated through thousands of p.d are slowed down

IV) X-rays are produced due to inner shell transition of electrons of target material

39. Characteristic x-rays of K-series are obtained when the electron transits to:

40. The lifetime of an electron in a metastable state is of the order of:

41. The nature of X-rays is:

42. The spectrum of x-rays is

43. Minimum energy required to ionize an atom is called:

44. The ratio of radii of the first stable orbit in the hydrogen atom to the second stable orbit is:

45. The spectrum formed by the transition of an electron of gas from a higher orbit to a lower orbit is:

46. According to Bohr’s theory of the hydrogen atom, it can be concluded that the radius of stable orbits is proportional to:

47. The spectrum of light emitted by molecules is:

48. In a hydrogen atom, when the electron jumps from n=4 to n=2 orbit, the wavelength of emitted radiation is:

49. The shortest wavelength in the Lyman series is 911.6 𝑨°, longest wavelength in the same series will be:

50. According to Bohr’s theory, an atom emits light when: