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NCERT CBSE CLASS 12 PHYSICS CHAPTER WISE MCQ

Welcome to your Chapter 12 Atoms MCQs

1. 
What is the valence electron in alkali metal?
2. 
Of the following pairs of species which one will have the same electronic configuration for both members?
3. 
Which of the following did Bohr use to explain his theory?
4. 
According to Bohr’s principle, what is the relation between the principal quantum number and the radius of the orbit?
5. 
Based on the Bohr model, what is the minimum energy required to remove an electron from the ground state of Be atom?
6. 
In which of the following system, will the radius of the first orbit (n=1) be minimum?
7. 
Which source is associated with a line emission spectrum?
8. 
According to the uncertainty principle for an electron, time measurement will become uncertain if which of the following is measured with high certainty?
9. 
Find the true statement.
10. 
he size of the atom is proportional to which of the following?
11. 
What is the ratio of minimum to maximum wavelength in the Balmer series?
12. 
The energy of characteristic X-ray is a consequence of which of the following?
13. 
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?
14. 
Which of the following is true regarding the Bohr model of atoms?
15. 
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?
16. 
When a hydrogen atom is in its first excited level, what is the relation of radius and Bohr radius?
17. 
Which theory explained that electrons revolved in circular orbits?
18. 
When is hydrogen stable?
19. 
Which of the following is found in the UV region of the spectrum?
20. 
How many spectral lines does hydrogen have?

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