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.

Answer 2

The circuit consists of two logic gates: a NOT gate and an AND gate. Let's analyze the circuit step by step:

1. The input to the NOT gate is 1, so the output of the NOT gate will be 0. Thus, the value of \( P \) is 0.
  
2. The output of the NOT gate (which is 0) is the input to the AND gate. The other input to the AND gate is also 0. Since an AND gate gives an output of 1 only when both inputs are 1, the output of the AND gate is 0.

Thus, the values of \( P \) and \( Q \) are:
- \( P = 0 \)
- \( Q = 1 \)

Therefore, the correct answer is \( P = 0, Q = 1 \).