Question

Following gates section is connected in a complete suitable circuit.

For which of the following combination, bulb will glow (ON):

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

Answer 1

The Correct Option is B

The bulb illuminates when a potential difference exists across it. This condition is met when one terminal of the bulb is at a high voltage level (1) and the other is at a low voltage level (0).

In Option (2), the configuration \( A = 1, B = 0, C = 0, D = 0 \) fulfills this requirement. The OR gate's output becomes high, establishing the necessary potential difference across the bulb.