Question:
Find the correct combination of A, B, C and D inputs which can cause the LED to glow.
Find the correct combination of A, B, C and D inputs which can cause the LED to glow.
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In NOR-gate circuits, the output is HIGH only when all inputs are LOW.
Updated On: Feb 24, 2026
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The Correct Option is B
Solution and Explanation
Step 1: Analyze the logic gates in the circuit.
The circuit consists of NOR gates at the inputs and output. The LED glows only when the final output is logic HIGH.
Step 2: Evaluate the logic condition.
For the LED to glow, the final NOR gate must receive all LOW inputs. This occurs when: \[ A=1,\; B=0,\; C=0,\; D=0 \] Step 3: Write the input combination.
\[ ABCD = 1000 \] Final Answer: \[ \boxed{1000} \]
The circuit consists of NOR gates at the inputs and output. The LED glows only when the final output is logic HIGH.
Step 2: Evaluate the logic condition.
For the LED to glow, the final NOR gate must receive all LOW inputs. This occurs when: \[ A=1,\; B=0,\; C=0,\; D=0 \] Step 3: Write the input combination.
\[ ABCD = 1000 \] Final Answer: \[ \boxed{1000} \]
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