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11. In intrinsic semiconductors, number of electrons __________ number of holes.
(A).Equal
(B).Greater than
(C).Less than
(D).Can not define


12. In n-type semiconductors, number of holes __________ number of electrons.
(A).Equal
(B).Greater than
(C).Less than
(D).Can not define


13. In p-type semiconductors, number of holes __________ number of electrons.
(A).Equal
(B).Greater than
(C).Less than
(D).Twice


14. Mobility of holes is ___________ mobility of electrons in intrinsic semiconductors.
(A).Equal
(B).Greater than
(C).Less than
(D).Can not define


15. Fermi level for extrinsic semiconductor depends on
(A).Donor element
(B).Impurity concentration
(C).Temperature
(D).All