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Class 12 Physics: Atoms
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MCQs on alpha particle scattering and rutherford nuclear model of atom, atomic spectra, bohr model, hydrogen atom line spectra and de broglie explanation of quantisation.

Class 12 Physics: Atoms
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25 Questions

1. Which of the following is found in the UV region of the spectrum?
2. How many spectral lines are there in the hydrogen spectrum?
3. Based on the Bohr model, what is the minimum energy required to remove an electron from the ground state of Be atom? (Given: Z = 4)
4. How did de – Broglie modify Bohr's postulate?
5. Identify the expression for Bohr's second postulate.
6. When a hydrogen atom is in its first excited level, what is the relation of radius and Bohr radius?
7. The size of the atom is proportional to which of the following?
8. What is the valence electron in alkali metal?
9. An α-particle of energy 10 MeV is scattered through 180o by a fixed uranium nucleus. Calculate the order of distance of the closest approach?
10. Find out the minimum energy required to take out the only one electron from the ground state of Li+?
11. What is the energy required to ionize an H-atom from the third excited state, if ground state ionization energy of H-atom is 13.6 eV?
12. What is the order of the radius of an electron orbit in a hydrogen atom?
13. The atomic number of silicon is 14. Its ground state electronic configuration is
14. Which of the following did Bohr use to explain his theory?
15. Which of the following is true regarding the Bohr model of atoms?
16. If an α-particle collides head-on with a nucleus, what is its impact parameter?
17. How did de – Broglie conclude the modification of Bohr's II postulate?
18. Which source is associated with a line emission spectrum?
19. Hydrogen atoms are excited from ground state to the state of principal quantum number 4. Then, what will be the number of spectral lines observed?
20. Of the following pairs of species which one will have the same electronic configuration for both members?
21. The kinetic energy of the α-particle incident on the gold foil is doubled. The distance of closest approach will also be doubled.
22. The energy of characteristic X-ray is a consequence of which of the following?
23. The radius of the Bohr orbit depends on which of the following?
24. Which theory explained that electrons revolved in circular orbits?
25. According to Bohr's principle, what is the relation between the principal quantum number and the radius of the orbit?

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