CBSE  /  Class 12  /  Physics  /  Atoms

  • 1. 
    An atom stays in an excited state for about:

  • 10 micro seconds
  • 10 milli seconds
  • 10 nano seconds
  • 10 seconds

  • 2. 
    The energy equivalent to one atomic mass unit is :

  • 1.6 × 10-19 J
  • 6.02 × 1023 J
  • 9.31 MeV
  • 931 MeV

  • 3. 
    Who explained the splitting of special lines in magnetic field?

  • Zeeman
  • Bohr
  • Summerfield
  • Einstein

  • 4. 
    The mass of a neutron is:

  • 1.00866 u
  • 1.0866 u
  • 1.866 u
  • 0.1866 u

  • 5. 
    Isobars have the same:

  • A
  • Z
  • N
  • All the above

  • 6. 
    Isotones have the same:

  • A
  • Z
  • N
  • All the above

  • 7. 
    Half-life of a substance depends on:

  • pressure
  • temperature
  • density
  • None of these

  • 8. 
    The concept of electron spin was introduced by:

  • Becquerel
  • Goudsmit
  • Millikan
  • Uhlenbeek and Goudsmit

  • 9. 
    The principle that a quantum orbital cannot be occupied by more than two electrons was given by:

  • Pauli
  • Millikan
  • Hund
  • None of these

  • 10. 
    For ionization of excited Hydrogen atom, the, required energy is:

  • a little less than 13.6
  • equal to 13.6
  • more than 13.6
  • 3.4 or less
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