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Conducting Materials – 1 – 2

6. Which material has the highest electrical conductivity ?

(a) Zinc
(b) silver
(c) brass
(d) 
gold

ANSWER

EXPLANATION

7. Gold and silver are :

(a) dielectric materials
(b) low resistivity conducting materials
(c) magnetic materials
(d) insulating materials

ANSWER

EXPLANATION

8. The property due to which the resistance of some metal or compound vanishes under certain conditions is :

(a) Semi conductivity
(b) Super conductivity
(c) Curie point
(d) Magnetostriction

ANSWER

EXPLANATION

9. The conductivity of copper is less than that of silver by :

(a) 5 – 10 %
(b) 50 – 60 %
(c) 80 – 90 %
(d) 20 – 30 %

ANSWER

EXPLANATION

10. The conductivity of an extrinsic semiconductor :

(a) decreases with temperature
(b) increases with temperature
(c) remains constant with temperature
(d) 
decreases and then increases with temperature

ANSWER

EXPLANATION

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