Questions in semiconductor

Select	Question
	For non-conductors, the energy gap is
	Donor type impurity is found in
	The difference in the variation of resistance with temperature in a metal and a semiconductor arises essentially due to the difference in the
	The charge on a hole is equal to the charge of
	When germanium is doped with phosphorus, the doped material has
	A Ge specimen is doped with Al. The concentration of acceptor atoms is $\approx 10^{21} atoms/m^3$. Given that the intrinsic concentration of electron hole pairs is $\tilde{\ }{{10}^{19}}/{{m}^{3}}$, the concentration of electrons in the specimen is
	Which of the following has negative temperature coefficient of resistance
	In semiconductors at a room temperature
	Regarding a semiconductor which one of the following is wrong
	Which of the following statements is true for an N-type semi-conductor