A UJT has ___________.

A. Two pn junctions

B. One pn junction

C. Three pn junctions

D. None of the above

Answer: Option B

Solution(By Examveda Team)

A Unijunction Transistor (UJT) has one pn junction.

The UJT consists of a single pn junction between its emitter and the base regions.

This single pn junction is used for the UJT's unique characteristics, including its ability to act as a trigger device in various electronic circuits.

Options A and C are incorrect as UJTs do not have two or three pn junctions; the correct number is one.