$A$ transistor cannot be used as an

Given below are two statements:
Statement $I :$ $PN$ junction diodes can be used to function as a transistor,simply by connecting two diodes back-to-back,which acts as the base terminal.
Statement $II :$ In the study of transistors,the amplification factor $\beta$ indicates the ratio of the collector current to the base current.
In the light of the above statements,choose the correct answer from the options given below:

An oscillator is nothing but an amplifier with

In a $P-N-P$ transistor,the emitter has ....... as majority carriers and the base has ....... as majority carriers.

For a transistor,$\beta = 100$. The value of $\alpha$ is

Find the value of $I_B$ if $V_{BE} = 0.3\,V$ in the given circuit $(\beta = 100)$. (in $,\mu A$)