Question

Transistors (devices that enable current switching) make use of

• A. Intrinsic semiconductor
• B. Extrinsic semiconductor
• C. both of them
• D. none of them

Answer 1

The correct option is B Extrinsic semiconductor

A transistor is a device which consists of a thin layer of one type of extrinsic semiconductor sandwiched between two thick layers of other types of extrinsic semiconductor. There are two types of transistors:

1. pnp transistor and,
2. npn transistor
   So, a transistor is made of extrinsic semiconductor.