Structure of Atom – Multiple Choice Questions (MCQs)

1. 13. According to Pauli's Exclusion Principle, no two electrons in an atom can have:

   • A. All four quantum numbers same
   • B. Same spin quantum number
   • C. Same principal quantum number
   • D. Same azimuthal quantum number

2. 14. Hund's Rule of Maximum Multiplicity states that:

   • A. Pairing of electrons in the orbitals belonging to the same subshell does not take place until each orbital has one electron
   • B. Electrons fill orbitals in increasing order of energy
   • C. No two electrons can have all four quantum numbers same
   • D. Electrons revolve around the nucleus in fixed orbits

3. 15. Aufbau principle states that:

   • A. Electrons are filled in orbitals in increasing order of their energy
   • B. Electrons revolve in fixed orbits
   • C. Electrons have dual nature
   • D. No two electrons can have all four quantum numbers same

4. 16. The maximum number of electrons that can be accommodated in an orbital is:

   • A. 2
   • B. 6
   • C. 10
   • D. 14

5. 17. What is the maximum number of electrons that can be accommodated in an 'M' shell?

   • A. 18
   • B. 8
   • C. 2
   • D. 32

6. 18. The phenomenon of emission of electrons from the surface of a metal when light of suitable frequency strikes it is called:

   • A. Photoelectric effect
   • B. Compton effect
   • C. Raman effect
   • D. Zeeman effect

7. 19. The line spectrum of hydrogen atom can be explained by:

   • A. Bohr's model
   • B. Rutherford's model
   • C. Thomson's model
   • D. Dalton's atomic theory

8. 20. Which series of hydrogen spectrum lies in the visible region?

   • A. Balmer series
   • B. Lyman series
   • C. Paschen series
   • D. Brackett series

9. 21. The energy of an electron in a hydrogen atom is given by the expression:

   • A. -13.6/n^2 eV
   • B. 13.6/n^2 eV
   • C. -2.18 x 10^-18/n^2 J
   • D. Both A and C

10. 22. Rutherford's alpha-scattering experiment led to the discovery of:

    • A. Atomic nucleus
    • B. Electron
    • C. Proton
    • D. Neutron

11. 23. The charge to mass ratio (e/m) for cathode rays was determined by:

    • A. J.J. Thomson
    • B. E. Goldstein
    • C. Ernest Rutherford
    • D. James Chadwick

12. 24. The wavelength associated with an electron moving with velocity 'v' is given by:

    • A. h/mv
    • B. mv/h
    • C. h/m
    • D. mv