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 
(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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