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JEE Main 2026 (28 Jan, Shift 2) · Logic Gates

Logic Gates question from JEE Main 2026 (28 Jan, Shift 2)

Q29JEE Main 2026 · 28 JAN · SHIFT 2Medium

Logic Gates

Two p-n junction diodes $D_1$ and $D_2$ are connected as shown in figure. $A$ and $B$ are input signals and $C$ is the output. The given circuit will function as a ________.

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Answer: (a)

Each diode has its anode at the output node (fed by $R$ from 5 V) and its cathode at an input.
If any input is 0 (0 V), that diode is forward biased and pulls $C$ to about 0: $C = 0$ .
Only when $A = B = 1$ are both diodes off, so $C$ = 5 V = 1.
$C = A \cdot B$ , so the answer is (a) AND Gate.

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