Physics General Science Test Hard Mode

Sr. #	Questions	Answers Choice
1	Copper and germanium are cooled to 70 K from room temperature then	Resistance of copper increases while that of germanium decreases Resistance of copper decreases while that of germanium increases Resistance of both decreases Resistance of both increases
2	When n-type of semiconductor is heated	Number of electrons increases while that of holes decreases Number of holes increases while that of electrons decreases Number of electrons and holes remains same Number of electrons and holes increases equally
3	The part of a transistor which is heavily doped to produce large number of majority carriers is	Emitter Base Collector Any of the above depending on nature of transistor.
4	A p-n junction has a thickness of the order of	1 cm 1 mm 10<sup>-6</sup> cm 10<sup>-12</sup> cm
5	When boron is added as an impurity to silicon the resulting material is	n type conductor n type semiconductor p-type conductor p-type semiconductor

News