Atoms and Electrons – 1 – 6

26. The electron density in conduction band is proportional to :

(a) Donor concentration
(b) Square of donor concentration
(c) Square root of donor concentration
(d) Cube root of donor concentration

ANSWER

EXPLANATION

27. Which electron in an element is responsible for chemical & electrical properties ?

(a) Valence electrons
(b) Revolving electrons
(c) Active electrons
(d) Passive electrons

ANSWER

EXPLANATION

28. The absolute zero temperature is equal to :

(a) 0°C
(b) 273°C
(c) –273°C
(d) 27°C

ANSWER

EXPLANATION

29. …….. number of electrons is responsible for its chemical and electrical properties.

(a) 32
(b) 14
(c) 16
(d) 9

ANSWER

EXPLANATION

30. An electron in a completely filled band :

(a) Contributes to the flow of electric current
(b) Does not contributes to the flow of electric current
(c) Can move but doesn’t contribute to the flow of electric current
(d) None of these

ANSWER

EXPLANATION

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