NEET Physics Semiconducting Devices NEET PYQ-Semiconducting Devices

The following circuit represents:                                                                                              [AIPMT 1999]

A)             OR gate

B)           XOR gate

C)      AND gate

D) NAND gate

Correct Answer: B

Solution :

Output of upper AND gate \[=\overline{A}B\]

Output of lower AND gate \[=A\overline{B}\]

Thus, output of OR gate \[=\overline{A}B+A\overline{B}\]

This is Boolean expression for XOR gate.

Note: XOR operation employed in XOR gate is called mod-2 addition and rules of addition are

\[0\oplus 0=0;\] \[0\oplus 1=1;\]

\[1\oplus 0=1;\] \[1\oplus 1=0\]