Semiconductor Materials – 2 – 9

91. A semiconductor has …….. temperature coefficient of resistance.

(a) positive
(b) zero
(c) negative
(d) none of the above

ANSWER

EXPLANATION

92. The most commonly used semiconductor is ……..

(a) germanium
(b) silicon
(c) carbon
(d) sulphur

ANSWER

EXPLANATION

93. A semiconductor has generally …….. valence electrons.

(a) 2
(b) 3
(c) 6
(d) 4

ANSWER

EXPLANATION

94. The resistivity of pure germanium under standard conditions is about ……..

(a) 6×10Ωcm
(b) 60 Ωcm
(c) 3×10Ωcm
(d) 6×10-4 Ωcm

ANSWER

EXPLANATION

95. The resistivity of pure silicon is about ……..

(a) 100 Ωcm
(b) 6000 Ωcm
(c) 3× 10Ωcm
(d) 1.6×10Ωcm

ANSWER

EXPLANATION

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