Semiconductor Materials – 2 – 10

96. When a pure semiconductor is heated, its resistance ……..

(a) goes up
(b) goes down
(c) remains the same
(d) cannot say

ANSWER

EXPLANATION

97. The strength of a semiconductor crystal comes from ……..

(a) forces between nuclei
(b) forces between protons
(c) electron-pair bonds
(d) none of the above

ANSWER

EXPLANATION

98. When a pentavalent impurity is added to a pure semiconductor, it becomes ……..

(a) an insulator
(b) an intrinsic semiconductor
(c) p-type semiconductor
(d) n-type semiconductor

ANSWER

EXPLANATION

99. Addition of pentavalent impurity to a semiconductor creates many ……..

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

ANSWER

EXPLANATION

100. The impurity level in an extrinsic semiconductor is about …………. of pure semiconductor.

(a) 10 atoms for 10atoms
(b) 1 atom for 10atoms
(c) 1 atom for 10atoms
(d) 1 atom for 100 atoms

ANSWER

EXPLANATION

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

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