166. The majority carriers of electricity in a N-type semiconductor are :
(a) Free electrons
(b) Holes
(c) Both electrons and holes
(d) Free ions
167. Doping of a semiconductor with small traces of impurity atoms generally changes the resistivity as follows :
(a) Decreases
(b) Increases
(c) Does not change
(d) May increases or decreases depending on the dopant
168. The forbidden energy of electricity in a p-type semiconductor are :
(a) Metals
(b) Insulators
(c) Semiconductor
(d) Semi metals
169. Resistivity of a semiconductor depends upon –
(a) Shape of semiconductor
(b) Atomic nature of the semiconductor
(c) Length of the semiconductor
(d) Shape and atomic nature of the semiconductor
170. In an intrinsic semiconductor –
(a) Only electrons carry current
(b) Only holes carry current
(c) Both electrons and holes carry current
(d) Both electrons and holes carry current with holes being the minority carriers
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