6. In a semiconductor, the total current is equal to :
(a) sum of electron and hole currents flow in same direction
(b) sum of electron and hole currents flow in opposite directions
(c) electron current only
(d) hole current only
7. The minority holes are about ……… that of electron.
(a) half
(b) same
(c) twice
(d) thrice
8. Germanium and silicon are :
(a) trivalent
(b) tetravalent
(c) pentavalent
(d) covalent
9. The volume charge density of mobile carriers is expressed in :
(a) coulombs / cubic meters
(b) coulombs / meters
(c) coulombs / seconds
(d) coulombs / volts
10. In a Silicon crystal, the number of covalent bonds a single atom can form is :
(a) 2
(b) 4
(c) 6
(d) 8
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