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
27. Which electron in an element is responsible for chemical & electrical properties ?
(a) Valence electrons
(b) Revolving electrons
(c) Active electrons
(d) Passive electrons
28. The absolute zero temperature is equal to :
(a) 0°C
(b) 273°C
(c) –273°C
(d) 27°C
29. …….. number of electrons is responsible for its chemical and electrical properties.
(a) 32
(b) 14
(c) 16
(d) 9
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
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