\begin{tabular}{|l|l|l|l|}
\hline & Column I & & Column II \\
\hline (A) & \begin{tabular}{l} Th....
\begin{tabular}{|l|l|l|l|}
\hline & Column I & & Column II \\
\hline (A) & \begin{tabular}{l}
Thermionic \\
Emission
\end{tabular} & P. & \begin{tabular}{l}
When light of \\
suitable frequency \\
is incident it take \\
place
\end{tabular} \\
\hline (B) & Field emission & Q. & \begin{tabular}{l}
When metal is \\
sufficiently heated
\end{tabular} \\
\hline (C) & \begin{tabular}{l}
Photoelectric \\
emission
\end{tabular} & R. & \begin{tabular}{l}
When a very high \\
Voltage is applied
\end{tabular} \\
\hline
\end{tabular}
\begin{tabular}{llll}
& A & B & C \\
(1) & \( \mathrm{p} \) & \( \mathrm{r} \) & \( \mathrm{q} \) \\
(2) & \( \mathrm{q} \) & \( \mathrm{r} \) & \( \mathrm{p} \) \\
(3) & \( \mathrm{r} \) & \( \mathrm{q} \) & \( \mathrm{p} \) \\
(4) & \( \mathrm{r} \) & \( \mathrm{p} \) & \( \mathrm{q} \)
\end{tabular}
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