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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

EXPLANATION

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

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

ANSWER

EXPLANATION

113. Identify N-type impurity from the following :

(a) Fe
(b) Ga
(c) Sb
(d) B

ANSWER

EXPLANATION

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

EXPLANATION

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

EXPLANATION

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