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Conducting Materials – 1 – 1

1. At low temperature, the resistivity of metals is proportional to the :

(a) 5th power of absolute temperature
(b) 6th power of absolute temperature
(c) 7th power of absolute temperature
(d) 9th power of absolute temperature

ANSWER

EXPLANATION

2. Which of the following doesn’t have forbidden energy gap between valence band and conductor band ?

(a) conductor
(b) insulator
(c) semiconductor
(d) none of the above

ANSWER

EXPLANATION

3. The electrical conductivity is directly proportional to :
(1) Electron density
(2) Relaxation time of electrons

(a) both 1 & 2
(b) only 2
(c) only 1
(d) neither 1 nor 2

ANSWER

EXPLANATION

4. 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

5. Which variety of copper has the best mechanical conductivity ?

(a) Pure annealed copper
(b) hard drawn copper
(c) unpure annealed copper
(d) 
cast copper

ANSWER

EXPLANATION

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