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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
Answer : (b)

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

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

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

Answer
Answer : (c)

Explanation
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73. P-type semiconductor is :

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

Answer
Answer : (b)

Explanation
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74. An N-type semiconductor is :

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

Answer
Answer : (d)

Explanation
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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
Answer : (c)

Explanation
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