QNEET-2024-Ph-159: NEET 2024 Physics - Class 12 NEET-2024-Ph-159 Solution: When the output of an OR gate is applied as input to a NOT gate …

When the output of an OR gate is applied as input to a NOT gate, the combination acts as a NOR gate. To understand why, let's examine the behavior of these logic gates. An OR gate outputs a logic high (1) when at least one of its inputs is high. Mathematically, this can be expressed as: Y OR = A + B Where A $A$ A and B $B$ B are the inputs, and Y OR $Y_{\text{OR}}$ Y OR _ is the output of the OR gate. An OR gate followed by a NOT gate inverts this output. The NOT gate, also known as an inverter, changes a high input to a low output, and vice versa. So the output of the NOT gate can be expressed as: Y NOT = Y OR _ = ( A + B ) _ This is exactly the logic operation performed by a NOR gate. Therefore, this combination of an OR gate followed by a NOT gate behaves as a NOR gate. So, the correct answer is Option B: NOR gate.