CBSE  /  Class 12  /  Physics  /  Nuclei

  • 1. 
    The isotope generally used for the treatment of cancer is:

  • I131
  • Hg197
  • O15
  • Co60

  • 2. 
    What percentage of radioactive substance is left after 5 half lives?

  • 3.125%
  • 6.25%
  • 12.33%
  • 31%

  • 3. 
    Mass is converted into energy according to the relation:

  • E = me²
  • E = mgh
  • E = \(\frac{3}{2}\)me²
  • E = \(\frac{mgH}{c^2}\)

  • 4. 
    The helium atom does not contain

  • two protons
  • two electrons
  • two neutrons
  • six nucleons

  • 5. 
    The more readily fissionable isotope of uranium has an atomic mass of:

  • 234
  • 235
  • 236
  • 238

  • 6. 
    Energy of electron in the 1st orbit of H-atom is:

  • -13.6 MeV
  • -13.6 eV
  • -13.6 J
  • 13.6 J

  • 7. 
    The mass no. of a nucleus is M and its atomic no. is Z. The number of neutrons in the nucleus is :

  • M - Z
  • M
  • Z
  • M + Z

  • 8. 
    The phenomena of radioactivity is:

  • Exothermic change with increase or decrease with temperature
  • increases on applied pressure
  • nuclear process does not depend on external factors
  • None of these

  • 9. 
    When one gm of mass is converted into energy, it is equal to:

  • 103 kWh
  • 109 kWh
  • 1010 kWh
  • 1011 kWh

  • 10. 
    In the given reaction:
    \(_{Z}^{A}\)X → \(_{Z+1}^{A}\) Y → \(_{Z-1}^{A-4}\) K → \(_{Z-1}^{A-4}\) K radioactive radiations are emitted in the sequence

  • α, β, γ
  • β, α, γ
  • γ, α, β
  • β, γ, α
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