Conducting Materials – Exercise – 1

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
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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
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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
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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
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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
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