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

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

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Materials and Components
With increase in temperature, the electrical conductivity would

Decrease in metals but increase in intrinsic semiconductor
Decrease in metals as well as in intrinsic semiconductor
Increase in metals but decrease in intrinsic semiconductor
Increase in metals as well as in intrinsic semiconductor

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