JEE Mains · Physics · STD 12 - Semicondutor electronics
- JEE Mains 2026
- Medium
- MCQ
Refer to the logic circuit given below. For two inputs \((A=1, B=1)\) and \((A=0, B=1)\), output \((Y)\) will be __________.

Pick an option to check your answer.
Answer & Solution
Correct Answer
(C) \(0, 0\) respectively
Step-by-step Solution
Detailed explanation
From the given logic circuit, we can determine the Boolean expression for the output \(Y\).
The output of the NOT gate is \(\bar{A}\).
The inputs to the OR gate are \(\bar{A}\) and \(B\), so its output is \(\bar{A} + B\).
The inputs to the AND gate are \(\bar{A}\) and \(B\), so its output is \(\bar{A} \cdot B\).
These two outputs are fed into a NOR gate. The final output \(Y\) is given by:
\(Y = \overline{(\bar{A} + B) + (\bar{A} \cdot B)}\)
Simplifying the Boolean expression:
\(Y = \overline{\bar{A} + B + \bar{A}B}\)
\(Y = \overline{\bar{A} + B(1 + \bar{A})}\)
\(Y = \overline{\bar{A} + B}\)
Using De Morgan's laws:
\(Y = \overline{\bar{A}} \cdot \bar{B} = A \cdot \bar{B}\)
Now, we evaluate \(Y\) for the given input combinations:
For \(A = 1, B = 1\):
\(Y = 1 \cdot \bar{1} = 1 \cdot 0 = 0\)
For \(A = 0, B = 1\):
\(Y = 0 \cdot \bar{1} = 0 \cdot 0 = 0\)
Therefore, the outputs are \(0\) and \(0\) respectively.
Answer: \(0, 0\) respectively
The output of the NOT gate is \(\bar{A}\).
The inputs to the OR gate are \(\bar{A}\) and \(B\), so its output is \(\bar{A} + B\).
The inputs to the AND gate are \(\bar{A}\) and \(B\), so its output is \(\bar{A} \cdot B\).
These two outputs are fed into a NOR gate. The final output \(Y\) is given by:
\(Y = \overline{(\bar{A} + B) + (\bar{A} \cdot B)}\)
Simplifying the Boolean expression:
\(Y = \overline{\bar{A} + B + \bar{A}B}\)
\(Y = \overline{\bar{A} + B(1 + \bar{A})}\)
\(Y = \overline{\bar{A} + B}\)
Using De Morgan's laws:
\(Y = \overline{\bar{A}} \cdot \bar{B} = A \cdot \bar{B}\)
Now, we evaluate \(Y\) for the given input combinations:
For \(A = 1, B = 1\):
\(Y = 1 \cdot \bar{1} = 1 \cdot 0 = 0\)
For \(A = 0, B = 1\):
\(Y = 0 \cdot \bar{1} = 0 \cdot 0 = 0\)
Therefore, the outputs are \(0\) and \(0\) respectively.
Answer: \(0, 0\) respectively
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