JEE Main 2025 Jan 24 Shift 2, Physics Q15: Logic Gates

JEE Main2025Jan 24, Shift 2Physics

The output of the circuit is low (zero) for :

(A) $X = 0, Y = 0$

(B) $X = 0, Y = 1$

(D) $X = 1, Y = 1$

Choose the correct answer from the options given below :

Solution

The circuit is an OR gate followed by an inverter, which together form a NOR gate. Its output is

$F = \overline{X + Y}$

Truth table:

X	Y	X+Y	$F = \overline{X + Y}$
0	0	0	1
0	1	1	0
1	0	1	0
1	1	1	0

The output is low (0) for inputs (B), (C) and (D).

Correct option: (3)

Concept behind this question

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