The Boolean equation $\overline{A} \cdot \overline{B} = \dots$

$A$ logic gate is an electronic circuit which

Identify the logic operation carried out by the given circuit :-

In the given logic circuit,$A=1$ and $B=0$. The values of $Y_1$ and $Y_2$ are respectively:

Two car garages have a common gate which needs to open automatically when a car enters either of the garages or cars enter both. Devise a circuit that resembles this situation using diodes.

In the circuit shown in the following figure,the value of $y$ is: