Semiconductor Materials – 1 – 2

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

ANSWER

EXPLANATION

7. The minority holes are about ……… that of electron.

(a) half
(b) same
(c) twice
(d) thrice

ANSWER

EXPLANATION

8. Germanium and silicon are :

(a) trivalent
(b) tetravalent
(c) pentavalent
(d) covalent

ANSWER

EXPLANATION

9. The volume charge density of mobile carriers is expressed in :

(a) coulombs / cubic meters
(b) coulombs / meters
(c) coulombs / seconds
(d) coulombs / volts

ANSWER

EXPLANATION

10. In a Silicon crystal, the number of covalent bonds a single atom can form is :

(a) 2
(b) 4
(c) 6
(d) 8

ANSWER

EXPLANATION

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