Q.

Choose which of the following resistivity values has a weak temperature dependence.

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a

Copper

b

Nichrome

c

Silver

d

Germanium

answer is C.

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Detailed Solution

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Materials like copper and aluminium are recognized for having low levels of resistivity, which makes them excellent for manufacturing electrical wires and cables since electrical current may easily pass through them. 

Although silver and gold have significantly lower resistivity ratings, they are more expensive to make into electrical cables.

Germanium is a semiconductor which is dependent on temperature. Its resistance decreases with an increase in temperature.

The resistivity of alloys is high. Nichrome's resistivity is only slightly temperature-dependent. A pure metal has a negligibly low resistivity at absolute zero, however, an alloy like nichrome has some residual resistance.

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