Question

In the following circuit what are P and Q :

• A. P = 1, Q = 0
• B. P = 0, Q = 1
• C. P = 0, Q = 0
• D. P = 0, Q = 0

Answer 1

The Correct Option is B

In this circuit, we have two logic gates: a NAND gate and a NOT gate.
The first gate is a NAND gate, which gives a low output (0) only when both inputs are high (1). Since one of the inputs is 1, the other input should be 0 for the output to be 0. So, \( P = 0 \).
The second gate is a NOT gate that inverts the input. The input to this NOT gate is 0, so its output will be 1.

Thus, \( Q = 1 \). Therefore, \( P = 0 \) and \( Q = 1 \).

The correct answer is (B) : P = 0, Q = 1.