Answer:
(a) A substance in which magnetic domains are aligned in parallel and antiparallel directions in unequal number resulting a net magnetic moment is called ferrimagnetic and this property is called ferrimagnetism. e.g. Fe3O4.
(b) A semiconductor in which doped impurity has more valence electrons than the pure element is called n-type semiconductor. e.g. Ge or Si (Group-14) doped with P or As(group-15).
(c) The energy gap between valence band and conduction band of a substance is called forbidden band (or Brullian zones).
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