JEE MAIN - Physics (2016 (Offline) - No. 2)
If $$a, b, c, d$$ are inputs to a gate and $$x$$ is its output, then, as per the following time graph, the gate is :
_en_2_1.png)
$$OR$$
$$NAND$$
$$NOT$$
$$AND$$
Explication
In case of an $$'OR'$$ gate the input is zero when all inputs are zero. If any one input is $$'1',$$ then the output is $$'1'.$$