Target Exam

CUET

Subject

Physics

Chapter

Semiconductors and Electronic Devices

Question:

Choose the logic operation carried out by the following current:

Options:

OR Gate

AND Gate

NAND Gate

NOR Gate

Correct Answer:

AND Gate

Explanation:

The correct answer is Option (2) → AND Gate

Each of the first two gates is a NOR gate whose inputs are tied together.

For the upper gate:

A NOR A = (A + A)' = A'

For the lower gate:

B NOR B = (B + B)' = B'

Thus the outputs of the first two gates are

A' and B'

These are fed into the final NOR gate, so

Y = (A' + B')'

Using De Morgan’s law

(A' + B')' = A · B

Y = A · B

Hence, the circuit represents an AND Gate.