How to use multiple versions of jQuery in an Application

Below scripts example to use multiple versions of jquery on same page.

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>
<script>var jq142 = jQuery.noConflict();</script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.4.4/jquery.min.js"></script>
<script>var jq144 = jQuery.noConflict();</script>
<script src="https://code.jquery.com/jquery-git.js?asdf"></script>
<script>var jq15 = jQuery.noConflict();</script>
<script>
  var $jq142 = jq142("body");
  var $jq144 = jq144("body");
  var $jq15 = jq15("body");
</script>