Class XII

Brass is an example of
  1. covalent crystal
  2. molecular crystal
  3. ionic crystal
  4. Metallic crystal
Which among the following is an example of non – polar molecule?
  1. Diethyl ether
  2. Water
  3. Methane
  4. Ethyl alcohol
Silicon carbide is an example of
  1. Ionic solid
  2. Molecular solid
  3. Network solid
  4. non – polar solid
Substances which are weakly repelled in magnetic field is known as
  1. Diamagnetic
  2. Paramagnetic
  3. Ferromagnetic
  4. Ferrimagnetic
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
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