86. Atoms inside a crystal possess –
(a) Discrete energy state
(b) Equidistant energy state
(c) Energy bands
(d) Equidistant energy bands
87. An electron is termed free electron, if found in –
(a) Conduction band
(b) Forbidden gap
(c) Valence band
(d) Either in valence band or conduction band
88. Valence and conduction bands overlap each other case of –
(a) Insulators
(b) Semiconductors
(c) Metals
(d) In all
89. Conduction band is practically empty in case of their resistivity –
(a) Insulators
(b) Semiconductors
(c) Metals
(d) None of these
90. Width for forbidden gap is maximum for :
(a) Metals
(b) Semiconductor
(c) Insulators
(d) All of them
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