Class XII

The isotope of uranium capable of sustaining chain reaction is
  1. U-235
  2. U-245
  3. U-239
  4. U-238
. Nuclear fission is caused by the impact of
  1. neutron
  2. proton
  3. deuteron
  4. electron
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
Which of the following rays are more penetrating?
  1. Beta rays
  2. Alpha rays
  3. Gamma rays
  4. X-rays
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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