6. Which material has the highest electrical conductivity ?
(a) Zinc
(b) silver
(c) brass
(d) gold
7. Gold and silver are :
(a) dielectric materials
(b) low resistivity conducting materials
(c) magnetic materials
(d) insulating materials
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
9. The conductivity of copper is less than that of silver by :
(a) 5 – 10 %
(b) 50 – 60 %
(c) 80 – 90 %
(d) 20 – 30 %
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
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