106. In which band(s) do the movements of electrons and holes take place ?
(a) Valence band
(b) Conduction band
(c) Conduction and valence bands respectively
(d) Neither valence nor conduction band
107. The ratio of majority and minority carriers of an intrinsic semiconductor is :
(a) Zero
(b) Infinity
(c) Unity
(d) Very large
108. The ratio of majority and minority carriers of an extrinsic semiconductor is :
(a) Zero
(b) Infinity
(c) Unity
(d) Very large
109. The forbidden in germanium at 0°K is :
(a) 0.785 eV
(b) 1.21 eV
(c) 1.00 eV
(d) 0.01 eV
110. The mean free path for electron drift increases with :
(a) Purity concentration
(b) Strain hardening
(c) Elastic modulus
(d) Length
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