On the basis of electrical conductivity, which one of the following material has the smallest resistivity?

The given circuit is equivalent to:

A p-type extrinsic semiconductor is obtained when Germanium is doped with:

The above figure shows the circuit symbol of a transistor. Select the correct statements given below:

(A) The transistor has two segments of p-type semiconductor separated by a segment of n-type semiconductor.

(B) The emitter is of moderate size and heavily doped.

(C) The central segment is thin and lightly doped.

(D) The emitter base junction is reverse biased in common emitter amplifier circuit.