Atoms MCQs Mock Test of Class 12th Physics

Welcome to your Atoms MCQs Mock Test of Class 12th Physics

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1. The ionisation energy of hydrogen atom is 13.6 eV. Following Bohr’s theory the energy corresponding to a transition between 3rd and 4th orbits is

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Q2. Rutherford’s experiments suggested that the size of the nucleus is about

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Q3.. In the Geiger-Marsden scattering experiment the number of scattered particles detected are maximum and minimum at the scattering angles respectively at

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Q.4. Which of the following series in the spectrum of hydrogen atom lies in the visible region of the electromagnetic spectrum?

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Q.5. In a hydrogen atom, which of the following electronic transitions would involve the maximum energy change

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Q.6. Hydrogen atom excites energy level from fundamental state to n = 3. Number of spectral lines according to Bohr, is

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Q.7. The transition from the state n = 4 to n = 3 in a hydrogen like atom results in ultraviolet radiation. Infrared radiation will be obtained in the transition from

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Q.8. For a given value of n, the number of electrons in an orbit is

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Q.9. Balmer series lies in which spectrum?

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Q.10. In Bohr model of hydrogen atom, let P.E. represents potential energy and T.E. represents the total energy. In going to a higher level.

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Q.11. Which of the following statements is correct in case of Thomson’s atomic model?

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Q. 12. Which one did Rutherford consider to be supported by the results of experiments in which α-particles were scattered by gold foil?

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Q.13. According to the Rutherford’s atomic model, the electrons inside the atom are

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Q.14. According to classical theory, the circular path of an electron in Rutherford atom model is

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Q.15. Rutherford’s α-particle experiment showed that the atoms have

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Q.16. Electrons in the atom are held to the nucleus by

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Q.17. The Rutherford α-particle experiment shows that most of the α-particles pass through almost unscattered while some are scattered through large angles. What information does

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Q.18. In Rutherford’s α -particle scattering experiment, what will be correct angle for α scattering for an impact parameter b = 0 ?

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Q.19. In the ground state in …A… electrons are in stable equilibrium while in …B… electrons always experiences a net force. Here, A and B refer to

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Q.20. The significant result deduced from the Rutherford’s scattering experiment is that

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Q.21. Electrons in the atom are held to the nucleus by

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Q.22. In a Rutherford scattering experiment when a projectile of charge Z1 and mass M1 approaches a target nucleus of charge Z2 and mass M2, the distance of closest approach is r0. The energy of the projectile is

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Q.23. According to classical theory, Rutherford’s atomic model is

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Q.24. Rutherford’s atomic model was unstable because

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Q.25. The electrons of Rutherford’s model would be expected to lose energy because, they

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Q.26. As one considers orbits with higher values of n in a hydrogen atom, the electric potential energy of the atom

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Q.27. Which of the following parameters is the same for all hydrogen-like atoms and ions in their ground states?

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Q.28. The angular speed of the electron in the nth orbit of Bohr hydrogen atom is

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Q.29. According to Bohr’s model of hydrogen atom

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Q.30. As the quantum number increases, the difference of energy between consecutive energy levels

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Q.31. Which of the following in a hydrogen atom is independent of the principal quantum number n? (The symbols have their usual meanings).

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Q.32. According to the Bohr theory of H-atom, the speed of the electron, its energy and the radius of its orbit varies with the principal quantum number n, respectively, as

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Q.33. In terms of Bohr radius r0, the radius of the second Bohr orbit of a hydrogen atom is given by

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Q.34. When hydrogen atom is in its first excited level, it’s radius is

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Q.35. The angular momentum of the electron in hydrogen atom in the ground state is

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Q.36. When an atomic gas or vapour is excited at low pressure, by passing an electric current through it then

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Q.37. The first spectral series was disscovered by

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Q.38. When an electron jumps from the fourth orbit to the second orbit, one gets the

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Q.39. The Balmer series for the H-atom can be observed

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.40. In Balmer series of emission spectrum of hydrogen, first four lines with different wavelength Hα Hβ Hγ and Hδ are obtained. Which line has maximum frequency out of these?

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Q.31. In which of the following series, does the 121.5 nm line of the spectrum of the hydrogen atom lie ?

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Q.42. Which of the following series in the spectrum of hydrogen atom lies in the visible region of the electromagnetic spectrum?

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Q.43. The shortest wavelength in Balmer’s series for Hydrogen atom is …A… and this is obtained by substituting …B … in Balmer’s formula. Here, A and B refer to

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Q.44. As an electron makes a transition from an excited state to the ground state of a hydrogen – like atom/ion

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Q.45. Bohr’s atom model is the modification of Rutherford’s atom model by the application of

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Q.46. In Bohr’s model electrons are revolving in a circular orbits around the nucleus called as

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Q.47. According to Bohr’s theory of H atom, an electron can revolve around a proton indefinitely, if its path is

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Q.48. According to Bohr the difference between the energies of the electron in the two orbits is equal to

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Q.49. The angular momentum of electrons in an atom produces

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Q.50. According to Planck’s quantum theory any electromagnetic radiation is

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