JEE Physics 2024 Question with Solution

Given: A circuit with two NOT gates and one OR gate.

Find: The logic operation performed by the overall circuit.

Each input passes through a NOT gate first, so the inputs become $\overline{A}$ and $\overline{B}$. These inverted outputs are then combined by the OR gate.

So the output can be written as

the solution further simplifies the circuit using De-Morgan’s law as

Hence, the overall logic operation is OR. Therefore, the correct option is C.

Given: Each input $A$ and $B$ is first inverted, and the resulting signals are applied to an OR gate.

Find: Which logic operation the circuit represents.

A NOT gate inverts its input:

• If $A = 0$, then $\overline{A} = 1$
• If $A = 1$, then $\overline{A} = 0$
• If $B = 0$, then $\overline{B} = 1$
• If $B = 1$, then $\overline{B} = 0$

Now these outputs enter an OR gate, which gives output $1$ when at least one input is $1$.

Thus, the final operation corresponds to an OR-type output. Therefore, the correct option is C, that is, OR.