Semiconductor Materials – 3 – 6

126. A pentavalent impurity has …….. valence electrons.

(a) 3
(b) 5
(c) 4
(d) 6

ANSWER

EXPLANATION

127. An N-type semiconductor is ……..

(a) positively charged
(b) negatively charged
(c) electrically neutral
(d) none of the above

ANSWER

EXPLANATION

128. A trivalent impurity has …….. valence electrons.

(a) 4
(b) 5
(c) 6
(d) 3

ANSWER

EXPLANATION

129. Addition of trivalent impurity to a semiconductor creates many ……..

(a) holes
(b) free electrons
(c) valence electrons
(d) bound electrons

ANSWER

EXPLANATION

130. A hole in a semiconductor is defined as ……..

(a) a free electron
(b) the incomplete part of an electron pair bond
(c) a free proton
(d) a free neutron

ANSWER

EXPLANATION

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