Semiconductor Materials – 3 – 2

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

ANSWER

EXPLANATION

107. The ratio of majority and minority carriers of an intrinsic semiconductor is :

(a) Zero
(b) Infinity
(c) Unity
(d) Very large

ANSWER

EXPLANATION

108. The ratio of majority and minority carriers of an extrinsic semiconductor is :

(a) Zero
(b) Infinity
(c) Unity
(d) Very large

ANSWER

EXPLANATION

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

ANSWER

EXPLANATION

110. The mean free path for electron drift increases with :

(a) Purity concentration
(b) Strain hardening
(c) Elastic modulus
(d) Length

ANSWER

EXPLANATION

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