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Choose the correct alternative: (a) Alloys of metals usually have (greater/less) resistivity than thatof their constituent metals. (b) Alloys usually have much (lower/higher) temperaturecoefficients of resistance than pure metals. (c) The resistivity of the alloy manganin is nearly independent of/increases rapidly with increase of temperature. (d) The resistivity of a typical insulator (e.g., amber) is greater thanthat of a metal by a factor of the order of (1022/1023).

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Solution

a)

Alloy of metals usually have greater resistivity than that of their constituent metals.

b)

Alloys usually have lower temperature coefficients of resistance than pure metals.

c)

The resistivity of the alloy manganin is nearly independent of with increase of temperature.

d)

The resistivity of a typical insulator is greater than that of a metal by a factor of the order of 10 22 _ .


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