| $A$ | $B$ | $E$ |
| 0 | 0 | 0 |
| 0 | 1 | $X$ |
| 1 | 0 | $Y$ |
| 1 | 1 | 0 |
Q19. The $I - V$ characteristics of an electronic device shown in the figure. The device is:\\
\includegraphics[max width=\textwidth, alt={}, center]{694a919f-a664-4e77-a59a-c8889b2816c1-04_303_408_479_264}\\
(1) a diode which can be used as a rectifier\\
(2) a zener diode which can be used as a voltage regulator\\
(3) a transistor which can be used as an amplifier\\
(4) a solar cell
Q20.\\
\includegraphics[max width=\textwidth, alt={}, center]{694a919f-a664-4e77-a59a-c8889b2816c1-04_264_554_1027_228}
\begin{center}
\begin{tabular}{ c | c | c }
$A$ & $B$ & $E$ \\
\hline
0 & 0 & 0 \\
0 & 1 & $X$ \\
1 & 0 & $Y$ \\
1 & 1 & 0 \\
\end{tabular}
\end{center}
In the truth table of the above circuit the value of X and Y are :\\
(1) 0,0\\
(2) 1,1\\
(3) 1,0\\
(4) 0,1