The isotope generally used for the treatment of cancer is:
  • I131
  • Hg197
  • O15
  • Co60
What percentage of radioactive substance is left after 5 half lives?
  • 3.125%
  • 6.25%
  • 12.33%
  • 31%
Mass is converted into energy according to the relation:
  • E = me²
  • E = mgh
  • E = \(\frac{3}{2}\)me²
  • E = \(\frac{mgH}{c^2}\)
The helium atom does not contain
  • two protons
  • two electrons
  • two neutrons
  • six nucleons
The more readily fissionable isotope of uranium has an atomic mass of:
  • 234
  • 235
  • 236
  • 238
Energy of electron in the 1st orbit of H-atom is:
  • -13.6 MeV
  • -13.6 eV
  • -13.6 J
  • 13.6 J
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
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
When one gm of mass is converted into energy, it is equal to:
  • 103 kWh
  • 109 kWh
  • 1010 kWh
  • 1011 kWh
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
0 h : 0 m : 1 s

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