\documentclass[a4paper]{article}
\usepackage{amsmath}
\usepackage[box,separateanswersheet]{automultiplechoice}

\begin{document}

\onecopy{2}{

\begin{question}{Physics:differentiatione1}
If y= $\frac{(1-x)^{2}}{x^{2}}$ then $\frac{dy}{dx}$ is
        \begin{choices}
           \wrongchoice{$\frac{2}{x^{2}}+\frac{2}{x^{3}}$}
           \correctchoice{$\frac{2}{x^{2}}-\frac{2}{x^{3}}$}
           \wrongchoice{$-\frac{2}{x^{2}}-\frac{2}{x^{3}}$}
           \wrongchoice{$-\frac{2}{x^{2}}+\frac{2}{x^{3}}$}
    	\end{choices}
\end{question}

\begin{question}{Physics:differentiatione2}
If $2t=v^{2}$,then $\frac{dv}{dt}$ is equal to
        \begin{choices}
           \wrongchoice{$0$}
           \correctchoice{$\frac{1}{v}$}
           \wrongchoice{$\frac{1}{4}$}
           \wrongchoice{$\frac{1}{2}$}
    	\end{choices}
\end{question}

\AMCcleardoublepage

\AMCformBegin

\namefield{\fbox{
                \begin{minipage}{.5\linewidth}
                  Firstname and lastname:

                  \vspace*{.5cm}\dotfill
                  \vspace*{1mm}
                \end{minipage}
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\begin{center}
  \bf\em Answers must be given exclusively on this sheet: 
  answers given on the other sheets will be ignored.
\end{center}

\AMCform

\AMCcleardoublepage

}

\end{document}
