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Semiconductor Materials – 4 – 4

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

Answer
Answer : (a)

Explanation
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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

Answer
Answer : (b)

Explanation
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168. The forbidden energy of electricity in a p-type semiconductor are :

(a) Metals
(b) Insulators
(c) Semiconductor
(d) Semi metals

Answer
Answer : (b)

Explanation
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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

Answer
Answer : (b)

Explanation
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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

Answer
Answer : (c)

Explanation
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