In common emitter amplifier of a transistor, if the ratio of the voltage gain and current amplification factor is 4 , then the ratio of the collector and base resistances is
$16: 1$
$1: 16$
$1: 4$
$4: 1$
If three logic gates are connected as shown in the figure, then the correct truth table of the circuit is

$$ \begin{array}{|c|c|c|} \hline A & B & y \\ \hline 0 & 0 & 1 \\ 0 & 1 & 0 \\ 1 & 0 & 0 \\ 1 & 1 & 1 \\ \hline \end{array} $$
$$ \begin{array}{|c|c|c|} \hline A & B & y \\ \hline 0 & 0 & 1 \\ 0 & 1 & 1 \\ 1 & 0 & 1 \\ 1 & 1 & 0 \\ \hline \end{array} $$
$$ \begin{array}{|c|c|c|} \hline A & B & y \\ \hline 0 & 0 & 0 \\ 0 & 1 & 0 \\ 1 & 0 & 0 \\ 1 & 1 & 1 \\ \hline \end{array} $$
$$ \begin{array}{|c|c|c|} \hline A & B & y \\ \hline 0 & 0 & 0 \\ 0 & 1 & 1 \\ 1 & 0 & 1 \\ 1 & 1 & 0 \\ \hline \end{array} $$
Ionosphere acts as a reflector for the frequency range of
$3-30 \mathrm{kHz}$
$3-30 \mathrm{MHz}$
$3-30 \mathrm{~Hz}$
$3-30 \mathrm{GHz}$
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