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

EXPLANATION

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

(a) T
(b) T2
(c) T3
(d) 1/T

ANSWER

EXPLANATION

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

EXPLANATION

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

EXPLANATION

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

EXPLANATION

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