Four logic gate symbols are given below. Which of these are the symbols for $OR$,$NOR$,and $NAND$ gates,respectively?

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 $(Y)$ of the logic circuit given below is $0$ only when:

Two $4-$bit binary numbers, $A = 1101$ and $B = 1010$, are given as inputs to the logic circuit shown in the figure below. The output $(Y)$ will be:

To get output $Y=1$ for the following circuit,the inputs should be:

The output waveform of the given logical circuit for the following inputs $A$ and $B$ as shown below,is: