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Semiconductor Materials – 3 – 3

111. Due to thermo-ionic emission, the weight of the metal piece :

(a) Increases
(b) Decreases
(c) Remains the same
(d) Varies but can’t define

Answer
Answer : (c)

Explanation
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112. The conductivity of a P-type semiconductor is :

(a) σ = qμoP
(b) σ = qμo
(c) σ = qμon
(d) σ = qp

Answer
Answer : (a)

Explanation
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113. Identify N-type impurity from the following :

(a) Fe
(b) Ga
(c) Sb
(d) B

Answer
Answer : (c)

Explanation
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114. Resistivity of a semiconductor depends upon :
(i) Atomic structure of the semiconductor.
(ii) Shape of the semiconductor.
(iii) Length of the semiconductor.
Of these statements

(a) (i) is correct
(b) (ii) is correct
(c) (iii) is correct
(d) (i) and (iii) are correct

Answer
Answer : (a)

Explanation
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115. The impurity atoms in semiconductors :

(a) Inject more charge carriers
(b) Reduce the energy gap
(c) Increase the kinetic energy of valence electrons
(d) All of the above

Answer
Answer : (b)

Explanation
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