Semiconductor Materials – 2 – 5

71. A hole is the vacancy created when :

(a) Free electron moves on application of electric field
(b) An electron breaks its covalent bond
(c) An atom core moves
(d) An electron reverts from conduction band to valency band

ANSWER

EXPLANATION

72. When a free electron is recaptured by a hole, the process is called :

(a) Diffusion
(b) Restoration
(c) Recombination
(d) Drift

ANSWER

EXPLANATION

73. P-type semiconductor is :

(a) Positively charged
(b) Electrically neutral
(c) Negatively charged
(d) Both a and b

ANSWER

EXPLANATION

74. An N-type semiconductor is :

(a) Positively charged
(b) Negatively charged
(c) Both (a) and (b)
(d) Electrically neutral

ANSWER

EXPLANATION

75. The diffusion constant for holes in germanium is found to be :

(a) 13 cm2/s
(b) 28 cm2/s
(c) 32 cm2/s
(d) 47 cm2/s

ANSWER

EXPLANATION

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