Question

Given below are two statements:

Statement I: PN junction diodes can be used to function as transistor, simply by connecting two diodes, back to back, which acts as the base terminal.

Statement II: In the study of transistor, the amplification factor $\beta$ indicates 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.

• A. Statement I is false but Statement II is true.
• B. Both Statement I and Statement II are true.
• C. Statement I is true but Statement II is false.
• D. Both Statement I and Statement II are false.

Answer 1

The correct option is A

Statement I is false but Statement II is true.

The explanation for statement I:

Transistor as an amplifier

1. A transistor is composed of three layers of semiconductor materials or more specifically terminals which help to make a connection to an external circuit and carry the current.
2. Statement 1 is false because in the case of two discrete back-to-back connected diodes, there are four doped regions instead of three and there is nothing that resembles a thin base region between an emitter and a collector.

The explanation for statement II:

The ratio of change in collector current $\left(\Delta I_C\right)$ to the change in base current$\left(\Delta I_B\right)$is known as the Base Current Amplification Factor. It is denoted by$\beta$.

So, Statement 2 is true.

Hence option A is correct