111. Due to thermo-ionic emission, the weight of the metal piece :
(a) Increases
(b) Decreases
(c) Remains the same
(d) Varies but canrsquo;t define
112. The conductivity of a P-type semiconductor is :
(a) σ = qμoP
(b) σ = qμo
(c) σ = qμon
(d) sigma; = qp
113. Identify N-type impurity from the following :
(a) Fe
(b) Ga
(c) Sb
(d) B
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
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
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