JEE Main 2026 · 2 Apr · Shift 2 · Physics Q30 · Dronacharya Exams

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PhysicsSingle correct+4 / -1Question 30 of 75

If $X$ and $Y$ are the inputs, the given circuit works as ________.

Logic circuit: X feeds both inputs of a NAND gate and Y feeds both inputs of another NAND gate; their outputs go to a third NAND gate, whose output feeds both inputs of a fourth NAND gate giving the Output.

A

OR gate

B

AND gate

C

NAND gate

D

NOR gate

Answer and worked solution

Official answer: D

Gate by gate (all four gates are NAND):

A NAND with both inputs tied is a NOT gate, so the first two give $\bar X$ and $\bar Y$ .
Third NAND: $\overline{\bar X\cdot\bar Y}=X+Y$ .
Last NAND (inputs tied): $\overline{X+Y}$ .

The circuit is a NOR gate.

(D)

Topics:Logic gates

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