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Asked in NEET 2005 · Conductors, insulators and semiconductors
Idea: in a semiconductor, warming the crystal creates carriers, and that works against resistivity rather than for it.
Raising the temperature breaks more covalent bonds, so the number of electron-hole pairs rises steeply.
More carriers means the conductivity goes up and the resistivity goes down.
A metal behaves the other way round -- its carrier count is fixed and extra lattice vibrations impede them -- but the statement is about semiconductors.
So 'the resistivity of a semiconductor increases with temperature' is the false statement.
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