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Semiconductor Materials – 3 – 7

131. As the doping to a pure semiconductor increases, the bulk resistance of the semiconductor ……..

(a) remains the same
(b) increases
(c) decreases
(d) none of the above

ANSWER

EXPLANATION

132. A hole and electron in close proximity would tend to ……..

(a) repel each other
(b) attract each other
(c) have no effect on each other
(d) none of the above

ANSWER

EXPLANATION

133. In a semiconductor, current conduction is due ……..

(a) only to holes
(b) only to free electrons
(c) to holes and free electrons
(d) none of the above

ANSWER

EXPLANATION

134. The random motion of holes and free electrons due to thermal agitation is called ……..

(a) diffusion
(b) pressure
(c) ionisation
(d) none of the above

ANSWER

EXPLANATION

135. A forward biased pn junction has a resistance of the ……..

(a) order of Ω
(b) order of k Ω
(c) order of M Ω
(d) none of the above

ANSWER

EXPLANATION

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