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Which of the following is unipolar transistor?

1. p-n-p transistor
2. n-p-n transistor
3. Field effect transistor
4. Point contact transistor

Correct answer: Field effect transistor

Solution

A field effect transistor (FET) is called unipolar because conduction occurs primarily through one type of majority carrier. In contrast, p-n-p and n-p-n transistors are bipolar devices, and point-contact transistor is not the standard unipolar choice here.

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