Conducting Materials – Exercise – 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
Answer : (a)
Explanation
No answer description available for this question. Let us discuss.

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
Answer : (a)
Explanation
No answer description available for this question. Let us discuss.

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
Answer : (a)
Explanation
No answer description available for this question. Let us discuss.

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
Answer : (c)
Explanation
No answer description available for this question. Let us discuss.

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
Answer : (a)
Explanation
No answer description available for this question. Let us discuss.
≡ LEVEL – Exercise – 1
« LEVEL  – Mcq & Notes
«« LEVEL  – Mcq & Notes
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