When the temperature of a semiconductor is increased,its resistance and electric conductivity respectively.

Carbon, silicon, and germanium atoms have four valence electrons each. Their valence and conduction bands are separated by energy band gaps represented by $(E_g)_C$, $(E_g)_{Si}$, and $(E_g)_{Ge}$ respectively. Which one of the following relationships is true in their case?

Choose only the false statement from the following:

The forbidden energy gap in the energy bands of germanium at room temperature is about $......$ $eV$.

Which of the following substances has an energy gap $(E_g)$ greater than $3 \ eV$?

Why does the resistivity of a semiconductor decrease with an increase in temperature?