Two diodes are connected in the following fashion. Provision is made to connect either $+5 \,V$ or ground $(0 \,V)$ to the points $A$ and $B$. The output $Q$ will act as

The output $W$ is given by:

The following logic gate combination is equivalent to

Which of the following circuits satisfies the logic condition $A=1, B=1$ and $D=1$?

The output $Y$ of the combination of gates shown is equal to :-

$A$ person applies a sine wave and a square wave to an $AND$ gate as shown in figures $(i)$ and $(ii)$. Assuming that both the voltages are applied in phase, the person observes the output at $E$ and $F$ on $(i)$ and $(ii)$, respectively. [Assume a minimum voltage of $5 \ V$ is equivalent to logic $1$].