Questions in semiconductor

Select	Question
	Consider the following statements A and B and identify the correct choice of the given answers(A) A zener diode is always connected in reverse bias (B) The potential barrier of a PN junction lies between 0.1 to 0.3 V approximately
	The correct symbol for zener diode is
	Which one of the following statements is not correct
	Which of the following semi-conductor diodes is reverse biased
	No bias is applied to a P-N junction, then the current
	Zener diode is used as
	The width of forbidden gap in silicon crystal is 1.1 eV. When the crystal is converted in to a N-type semiconductor the distance of Fermi level from conduction band is
	A semiconductor X is made by doping a germanium crystal with arsenic (Z = 33). A second semiconductor Y is made by doping germanium with indium (Z = 49). The two are joined end to end and connected to a battery as shown. Which of the following statements is correct
	In P-N junction, the barrier potential offers resistance to
	Symbolic representation of photodiode is