Class XII

. Nuclear fission is caused by the impact of
  1. neutron
  2. proton
  3. deuteron
  4. electron
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
In an atomic nucleus, neutrons and protons are held together by
  1. gravitational forces
  2. exchange forces
  3. coulombic forces
  4. magnetic forces
Who suggested that most of the mass of the atom is located in the nucleus?
  1. Thompson
  2. Bohr
  3. Rutherford
  4. Einstein
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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