181. The typical example of semiconductor is :
(a) Platinum
(b) Quartz
(c) Germanium
(d) Mica
182. In Semiconductor, like silicon, the unit cell is :
(a) A simple cube
(b) Hexagonal
(c) Face cantered cube
(d) Triclinic
183. The distinction between conductors, insulators and semiconductor is largely concerned with :
(a) Their ability to conduct current
(b) Relative width of energy gap
(c) binding energy of their electrons
(d) The type of crystal lattice
184. The width of forbidden gap for insulators (P), semiconductor (Q) and metals (R) are such that :
(a) Width in (P) is low, (Q) is high and (R) is overlapped
(b) Width in (P) is high, (Q) is small and (R) is very – very small
(c) Width in (P) is wide, (Q) is relatively small and (R) is overlapped
(d) None of the above
185. Semiconductor atoms are held together by :
(a) Ionic bond
(b) Covalent bond
(c) Vander Wall’s bond
(d) Metallic bond
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