Class XII

When heated to high temperature, ferromagnetic substance changes to
  1. Ferrimagnetic
  2. insulators
  3. paramagnetic
  4. diamagnetic
An atom located at the body center of a cubic unit cell is shared by
  1. 8 adjacent unit cells
  2. 4 adjacent unit cells
  3. 2 adjacent unit cells
  4. no other unit cells
The process by which impurity is introduced in semiconductors to enhance its conductivity is known as
  1. Magnetic moment
  2. Overlapping
  3. Doping
  4. Superconductivity
Which among the following is not an example of amorphous solids?
  1. Quartz
  2. Glass
  3. Plastic
  4. Coke
Order of increasing melting points among H2OH2O(s) , C(s) , CS2CS2 and Sn is
  1. Sn
  2. C
  3. CS2
  4. CS2
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