In semiconductors at room temperature,

This question has Statement $1$ and Statement $2$. Of the four choices given after the Statements,choose the one that best describes the two Statements.
Statement $1$ : $A$ pure semiconductor has a negative temperature coefficient of resistance.
Statement $2$ : On raising the temperature,more charge carriers are released into the conduction band.

How are holes produced in a semiconductor?

If the energy gap of a substance is $5.4 \ eV$,then the substance is

$A$ piece of copper and another of germanium are cooled from room temperature to $80\, K$. Which of the following is a correct statement?

The energy gap in semiconductors is of the order of ........ $eV$.