CBSE  /  Class 12  /  Physics  /  Atoms

  • 1. 
    According to Bohr's theory of hydrogen atom, the radius r of stationary orbit are related to principal quantum number n as:

  • rg ∝ \(\frac{1}{n^2}\)
  • rg ∝ \(\frac{1}{n}\)
  • rg ∝ n
  • rg ∝ n²

  • 2. 
    Fg and Fe represents the gravitational and electrostatic force respectively between two electrons situated at some distance the ratio \(\frac{F_g}{F_e}\) is if the order of:

  • 9.8
  • 109
  • 1042
  • 10-42

  • 3. 
    Artificial radioactivity was discovered by:

  • Joliot
  • Becquerel
  • Pauli
  • None of these

  • 4. 
    P-decay produces:

  • isobars
  • isotopes
  • isotones
  • All the above

  • 5. 
    Natural radioactivity was discovered by:

  • Joliot
  • Becquerel
  • Pauli
  • None of these

  • 6. 
    Transmutation of nuclei was discovered by:

  • Rutherford
  • Becquerel
  • Pauli
  • None of these

  • 7. 
    The energy equivalent to mass defect is called :

  • binding energy
  • internal energy
  • external energy
  • enthalpy

  • 8. 
    The total energy that will be released if a nucleus is built from its constituents is called the:

  • binding energy of the nucleus
  • binding energy of the solid
  • binding energy of the atom
  • None of these

  • 9. 
    The binding energy of \(_{2}^{4}\)He is about:

  • 28.3 eV
  • 28.3 MeV
  • 28.3 J
  • 2.83 MeV

  • 10. 
    The binding energy of a deuteron is about:

  • 2.22 MeV
  • 2.22 J
  • 2.22 eV
  • None of these
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