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Conductor and Insulators

What is the d...

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What is the dependence of resistivity on temperature for the following 1. Metals 2. Conductors 3. Semiconductors 4. Alloys 5. Non metals

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Q. Temperature dependence of resistivity

ρ (T)

of semiconductors, insulators and metals is significantly based on the following factors

Q. Write the dependency of resistivity of metals on temperature?

Q. Assertion :The temperature coefficient of resistance is always positive Reason: On increasing the temperature the resistance of metals and alloys increase

Choose the correct alternative:

(a) Alloys of metals usually have (greater/less) resistivity than that of their constituent metals.

(b) Alloys usually have much (lower/higher) temperature coefficients 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 than that of a metal by a factor of the order of (10²²/10³).

Q. Alloys are homogenous mixtures of a metal with a metal or non-metal. Which among the following alloys contain non-metal as one of its constituents?

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