The band gap in Germanium and Silicon in $eV$ respectively is

$A$ solid which is transparent to visible light and whose electrical conductivity increases with temperature is formed by:

Bonding in a germanium crystal (semiconductor) is:

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.

At absolute zero temperature,pure silicon behaves as

State the conductivity and resistivity of a semiconductor.