Discussion
The increase in temperature, the electrical conductivity would
Answer: C
With rising temperature the conductivity of a metal decreases and that of a semiconductor increases. In a metal the number of free electrons is essentially fixed, while lattice vibrations grow and scatter them more, so mobility and conductivity fall. In a semiconductor, heat frees more electrons and holes across the band gap, and the rise in carrier concentration outweighs the fall in mobility, so conductivity rises. Options A, B and D give the wrong direction for one or both materials, so option C is correct.
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