\documentclass[a4paper]{article}
\usepackage{tikz}
\usepackage[nowatermark]{automultiplechoice}    
\begin{document}

\onecopy{10}{    

\noindent{\bf DIFFERENT SHAPES}

\vspace{2ex}\hrule\vspace{2ex}

\AMCboxDimensions{height=5ex,width=2ex,shape=square}

\begin{question}{rectangle}
Rectangle
\begin{choices}
\correctchoice{Answer}
\end{choices}
\end{question}

\AMCboxDimensions{size=5ex,shape=oval}

\begin{question}{circle}
Circle
\begin{choices}
\correctchoice{Answer}
\end{choices}
\end{question}

\AMCboxDimensions{height=5ex,width=2ex,shape=oval}

\begin{question}{oval}
Oval
\begin{choices}
\correctchoice{Answer}
\end{choices}
\end{question}

\AMCboxDimensions{height=2ex,width=5ex,shape=oval}

\begin{question}{ovalh}
Oval (horizontal)
\begin{choices}
\correctchoice{Answer}
\end{choices}
\end{question}



}   

\end{document}
