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JEE Main 2016 · 3 Apr · Shift 1, Physics question 23

If a, b, c, d are inputs to a gate and xx is its output, then, as per the following time graph, the gate is :

Timing diagram of inputs d, c, b, a and output x: d is a fast square wave, c a slower one, b goes high in the middle and low again, a goes high near the end; x goes high when d first goes high and stays high throughout.
Choose one option
Answer and worked solution

Official answer: C

The output goes high as soon as any input (here d) is high and stays high while at least one input is high. That is an OR gate.

Topics:Logic gates
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