Semiconductor Materials – 1 – 9

41. The forbidden energy gap Ein a semiconductor is a function of :

(a) Current
(b) Voltage
(c) Potential
(d) Temperature

ANSWER
Answer : (d)

EXPLANATION
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42. Intrinsic concentration of charge carriers in a semiconductor varies as :

(a) T
(b) T2
(c) T3
(d) 1/T

ANSWER
Answer : (c)

EXPLANATION
No answer description available for this question. Let us discuss.

43. On increasing the impurity concentration in the metal, the residual part of the resistivity :

(a) Decreases
(b) Increases
(c) Remains constant
(d) May increase or decrease

ANSWER
Answer : (b)

EXPLANATION
No answer description available for this question. Let us discuss.

44. At room temperature in intrinsic germanium, there is about :

(a) One free electron for every 109 atoms
(b) One free electron for every 1010 atoms
(c) One free electron for every 1012 atoms
(d) One free electron for every 1015 atoms

ANSWER
Answer : (a)

EXPLANATION
No answer description available for this question. Let us discuss.

45. A compensated semiconductor is doped with :

(a) Only donor impurities
(b) Only acceptor impurities
(c) Both donor and acceptor impurities
(d) Neither donor nor acceptor impurity

ANSWER
Answer : (c)

EXPLANATION
No answer description available for this question. Let us discuss.

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