Semiconductor Materials – 3 – 10

146. In an intrinsic semiconductor, the number of free electrons ……..

(a) equals the number of holes
(b) is greater than the number of holes
(c) is less than the number of holes
(d) none of the above

ANSWER

EXPLANATION

147. At room temperature, an intrinsic semiconductor has ……..

(a) many holes only
(b) a few free electrons and holes
(c) many free electrons only
(d) no holes or free electrons

ANSWER

EXPLANATION

148. At absolute temperature, an intrinsic semiconductor has ……..

(a) a few free electrons
(b) many holes
(c) many free electrons
(d) no holes or free electrons

ANSWER

EXPLANATION

149. At room temperature, an intrinsic silicon crystal acts approximately as ……..

(a) a battery
(b) a conductor
(c) an insulator
(d) a piece of copper wire

ANSWER

EXPLANATION

150. P-type semiconductors are :

(a) +very charged
(b) Electrically neutral
(c) Obtained when phosphorus is added as impurity to silicon or germanium
(d) Obtained when arsenic is added as impurity to germanium or silicon

ANSWER

EXPLANATION

1 2 3 4 5 6 7 8 9 10 Exercise 4

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