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Solution


Q.

Following gates section is connected in a complete suitable circuit.

For which of the following combination, bulb will glow (ON)                      [2024]
1 A  = 0, B = 0, C = 0, D = 1  
2 A = 1, B = 1, C = 1, D = 0  
3 A = 1, B = 0, C = 0, D = 0  
4 A = 0, B = 1, C = 1, D = 1  

Ans.

(3)

Bulb is only on when across the bulb, signals are opposite → 0,1 or 1,0

A → Signals are 0 and 0

B → Signals are 1 and 1

C → Signals are 0 and 1

D → Signals are 0 and 0

So, the bulb is on only in option C.