<div class="modal fade" id="instructionsModal">
  <div class="modal-dialog">
    <div class="modal-content">
      <div class="modal-body">
        <p>Some question instructions...</p>
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-default" data-dismiss="modal">I got it</button>
      </div>
    </div>
  </div>
</div>
 
<script type="text/javascript" charset="utf-8">
  $(document).on('ready pjax:scriptcomplete',function(){
    // Show the modal
    $('#instructionsModal').modal({
      backdrop: 'static',
      keyboard: false
    }).modal('show');
  });
</script>