Regarding a semiconductor,which one of the following is wrong?

Define the energy gap and the forbidden gap.

$A$ piece of semiconductor is connected in series in an electric circuit. On increasing the temperature,the current in the circuit will

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?

What is the relationship between the number density of free electrons $(n)$ and temperature $(T)$ in a semiconductor?

Give a classification of semiconductors and write examples of each.