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Semiconductor Materials – 1 – 10

46. Donor impurity atoms in a semiconductor results in the formation of new :

(a) Wide energy band
(b) Narrow energy band
(c) Discrete energy level just below conduction
(d) Discrete energy level just above conduction

ANSWER

EXPLANATION

47. The depletion region of a semiconductor has :

(a) Only free electrons
(b) Only holes
(c) Both free electrons and holes
(d) Absence of free electrons and holes

ANSWER

EXPLANATION

48. Current flow through the semiconductor is due to :

(a) Drift current
(b) Diffusion current
(c) Recombination of charges
(d) All of the above

ANSWER

EXPLANATION

49. The depletion layer across the junction contains :

(a) Mobile carriers
(b) No mobile carriers
(c) Immobile carriers
(d) No charge carriers

ANSWER

EXPLANATION

50. For both Ge and Si, the barrier voltage decreases by about :

(a) 1 mV/°C
(b) 2 mV/°C
(c) 3 mV/°C
(d) 5 mV/°C

ANSWER

EXPLANATION

1 2 3 4 5 6 7 8 9 10 Exercise 2
 

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