Atoms and Electrons – 1 – 4

16. Which type of the following structures contains two atoms per cell ?

(a) Body centered cubic
(b) Face centered cubic
(c) Single cubic cell
(d) None of the above

17. In silicon material, the mobility of free electron is :

(a) 2.5 m^2/Vs
(b) 2.7 m^2/Vs
(c) 1.66 m^2/Vs
(d) 2.33 m^2/Vs

18. A Nixie cold cathode glow discharge tube has :

(a) 20 cathodes
(b) 15 cathodes
(c) 14 cathodes
(d) 10 cathodes

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

(a) Half
(b) Same
(c) Twice
(d) Thrice

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

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

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