Exemplo

HTML

<script type="text/javascript" src="https://www.gstatic.com/charts/loader.js"></script>
  <div id="grafico"></div>

JavaScript

google.charts.load('current', {'packages': ['corechart']});
google.charts.setOnLoadCallback(drawChart);

function drawChart() {
    var data = google.visualization.arrayToDataTable([
        ['Pergunta', 'Valor 1', 'Valor 2'],
        ['Pergunta 1', 2, 3],
        ['Pergunta 2', 4, 1],
        ['Pergunta 3', 1, 1]
    ]);

    var options = {
        height: 600,
        vAxis: {
          ticks: [{v:1, f:"Ă“timo 1"},
          {v:2, f:"Bom 2"},
          {v:3, f:"Regular 3"},
          {v:4, f:"Ruim 4"}]
        }        
    };

    var chart = new google.visualization.LineChart(document.getElementById('grafico'));

    chart.draw(data, options);
}