96. When a pure semiconductor is heated, its resistance ……..
(a) goes up
(b) goes down
(c) remains the same
(d) cannot say
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
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
99. Addition of pentavalent impurity to a semiconductor creates many ……..
(a) free electrons
(b) holes
(c) valence electrons
(d) bound electrons
100. The impurity level in an extrinsic semiconductor is about …………. of pure semiconductor.
(a) 10 atoms for 108 atoms
(b) 1 atom for 108 atoms
(c) 1 atom for 104 atoms
(d) 1 atom for 100 atoms
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