Csdrhrt

Since 2005, I have generally used this model to create multiple-choice tests for my students. I kindly ask you if there are packages or macros, or particular strategies to have squares with the letters A, B, C, D inside. I created the letter E with the underline (tabular) if, for pure typing error or distraction, I had not put the correct answer.

As you can see with the red arrows I do not have perfect squares and I think that all this depends on the letter used. But is it possible to find a solution to not use tabular? There is also another problem. Should I use aligned or other strategies to get a perfect alignment in mathematical mode? In which way could I have an optimal result?

Here there is my MWE:

documentclass[leqno,11pt,landscape,a3paper]{extarticle}

usepackage{graphicx,multicol,mathtools}

usepackage[T1]{fontenc}

usepackage[utf8]{inputenc}

begin{document}







begin{multicols}{1}

begin{enumerate}





item La velocità di 1,00$cdot 10^2$ m/s espressa in km/h è:



$fbox{A}$  36 km/h.\

$fbox{B}$    360 km/h.\

$fbox{C}$  27,8 km/h.\

$fbox{D}$    $3,!60cdot 10^{8}$ km/h.\

$fbox{E}$ begin{tabular}{lllllllllllll}

multicolumn{1}{c}{} & multicolumn{1}{c}{} & multicolumn{1}{c}{} & multicolumn{1}{c}{} & multicolumn{1}{c}{} & multicolumn{1}{c}{} & multicolumn{1}{c}{} & multicolumn{6}{c}{} \

hline

end{tabular}



item In fisica nucleare si usa l'angstrom (simbolo: 1AA=$10^{-10}$ m) e il fermi o femtometro (1 fm= $10^{-15}$ m). Qual è la relazione tra queste due unità di misura?



$fbox{A}$  1 AA = $10^5$ fm.\

$fbox{B}$    1 AA = $10^{-5}$ fm.\

$fbox{C}$    1 AA = $10^{-15}$ fm.\

$fbox{D}$    1 AA = $10^{3}$ fm.\

$fbox{E}$ begin{tabular}{lllllllllllll}

multicolumn{1}{c}{} & multicolumn{1}{c}{} & multicolumn{1}{c}{} & multicolumn{1}{c}{} & multicolumn{1}{c}{} & multicolumn{1}{c}{} & multicolumn{1}{c}{} & multicolumn{6}{c}{} \

hline

end{tabular}



end{enumerate}

end{multicols}



clearpage

end{document}

The obvious problem is that D is wider than A.

We can get a true square around capital letters by using the height as width:

documentclass{article}



newcommand{squarecap}[1]{fbox{makebox[height]{#1}}}



begin{document}



squarecap{A}par

squarecap{B}par

squarecap{C}par

squarecap{D}par

squarecap{E}par

squarecap{M}par



end{document}

The question about the angstrom is of a different kind: AA=$1$ has no space; if you don't want to use siunitx (which is however recommended), type in

$1,textup{AA} = 10^5,textup{fm}$

You can use eqmakebox[<tag>][<align>]{<stuff>} to have all <stuff> with the same <tag> be set <align>ed in a box of maximum width. Below I've played around with those so you can see what the effect is:

documentclass{extarticle}



usepackage[UTF8]{inputenc}



usepackage{siunitx,eqparbox}



% https://tex.stackexchange.com/a/34412/5764

makeatletter

NewDocumentCommand{eqmathbox}{o O{c} m}{%

  IfValueTF{#1}

    {defeqmathbox@##1##2{eqmakebox[#1][#2]{$##1##2$}}}

    {defeqmathbox@##1##2{eqmakebox{$##1##2$}}}

  mathpaletteeqmathbox@{#3}

}

makeatother



sisetup{

  per-mode = symbol

}



newcommand{makeoption}[2][default]{fbox{eqmakebox[#1]{#2}}}

newcommand{genericoption}{rule[-.2baselineskip]{100pt}{.4pt}}



begin{document}



begin{enumerate}

  item La velocità di SI{1e2}{metrepersecond} espressa in si{kilometreperhour} è:



    makeoption{A} eqmakebox[first][r]{SI{36}{km/h}}.     \

    makeoption{B} eqmakebox[first][r]{SI{360}{km/h}}.    \

    makeoption{C} eqmakebox[first][r]{SI{27.8}{km/h}}.   \

    makeoption{D} eqmakebox[first][r]{SI{3.60e8}{km/h}}. \

    makeoption{E} genericoption



  item In fisica nucleare si usa l'angstrom (simbolo: $SI{1}{AA} = SI{1e-9}{m}$) e il fermi o femtometro ($SI{1}{fm} = SI{1e-14}{m}$). 

    Qual è la relazione tra queste due unità di misura?



    makeoption{A} $SI{1}{AA} = eqmathbox[second][r]{SI{d5}{fm}}$.   \

    makeoption{B} $SI{1}{AA} = eqmathbox[second][r]{SI{d-5}{fm}}$.  \

    makeoption{C} $SI{1}{AA} = eqmathbox[second][r]{SI{d-15}{fm}}$. \

    makeoption{D} $SI{1}{AA} = eqmathbox[second][r]{SI{d{3}}{fm}}$. \

    makeoption{E} genericoption



end{enumerate}



end{document}

I'd suggest using siunitx to set content that has units.

Make the content of all your boxes the same width and don't set your units incorrectly, the spacing and font types are all wrong.

documentclass{extarticle}



usepackage{siunitx}



begin{document}



fbox{makebox[0.9em]{A}} $SI{1}{angstrom} = SI{e5}{fm}$.



fbox{makebox[0.9em]{B}} $SI{1}{angstrom} = SI{e-5}{fm}$.



fbox{makebox[0.9em]{C}} $SI{1}{angstrom} = SI{e-5}{fm}$.



fbox{makebox[0.9em]{D}} $SI{1}{angstrom} = SI{e-5}{fm}$.



fbox{makebox[0.9em]{E}} rule{2.2cm}{0.5pt}



end{document}