Materials and Components
Electrical contact materials used in switches, brushes, relay must possess

Low thermal conductivity and low melting pointL
High thermal conductivity and low melting point
Low thermal conductivity and high melting point
High thermal conductivity and high melting point

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Materials and Components
At room temperature the number of conducting electrons in an intrinsic semiconductor

Is a very small fraction of the number of valence electrons
Is almost equal to the number of valence electrons
Is small as compared to the number of valence electrons
Is about half the number of valence electrons

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Materials and Components
The residual resistivity of a binary alloy at 0 K is

Difference of residual resistivities of component metals
Dependent on the concentration of minor component in the alloy
Product of residual resistivities of component metals
Sum of residual resistivities of component metals

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