Class XII

. Nuclear fission is caused by the impact of
  1. neutron
  2. proton
  3. deuteron
  4. electron
The isotope of uranium capable of sustaining chain reaction is
  1. U-235
  2. U-245
  3. U-239
  4. U-238
Atoms of an element differ from those of all other elements in
  1. atomic number and electronic configuration
  2. number of neutrons and number of valence electrons
  3. atomic number and number of valence electrons
  4. D. number of neutrons and electronic configuration
The age of most ancient geological formations is estimated by
  1. . Ra - Si method
  2. Potassium - argon method
  3. . C14 method
  4. Uranium - lead method
Which of the following has a least penetrating power?
  1. All have same penetrating power
  2. Beta Particles
  3. Alpha particles
  4. Gamma rays
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