46. Donor impurity atoms in a semiconductor results in the formation of new :
(a) Wide energy band
(b) Narrow energy band
(c) Discrete energy level just below conduction
(d) Discrete energy level just above conduction
47. The depletion region of a semiconductor has :
(a) Only free electrons
(b) Only holes
(c) Both free electrons and holes
(d) Absence of free electrons and holes
48. Current flow through the semiconductor is due to :
(a) Drift current
(b) Diffusion current
(c) Recombination of charges
(d) All of the above
49. The depletion layer across the junction contains :
(a) Mobile carriers
(b) No mobile carriers
(c) Immobile carriers
(d) No charge carriers
50. For both Ge and Si, the barrier voltage decreases by about :
(a) 1 mV/°C
(b) 2 mV/°C
(c) 3 mV/°C
(d) 5 mV/°C
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