Materials and Components
In an intrinsic semiconductor, at a given temperature T

The number of electrons-hole pairs generated per second due to thermal motion are equal to the number of electron-hole pairs lost per second due to recombination
The number of electron hole pairs generated per second due to thermal motion is always more than the number of electron-hole pairs lost per second due to recombination
The number of electron-hole pairs generated per second due to thermal motion is always less than the number of electron-hole pairs lost per second due to recombination
Any of the above

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

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

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