Example of using onValidateQuestion event
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Survey.Survey.cssType = "bootstrap";
Survey.defaultBootstrapCss.navigationButton = "btn btn-green";

window.survey = new Survey.Model({
    questions: [
        { type: "multipletext", name: "pricelimit", title: "What is the... ", isRequired: true, colCount: 2,
        items: [{ name: "leastamount", title: "The least amount you have ever paid for a computer",
            validators: [{ type: "numeric", minValue: 10, maxValue: 10000 }]
        },
            {  name: "mostamount", title: "The most amount you have ever paid for a computer",
            validators: [{ type: "numeric", minValue: 10, maxValue: 10000 }]
            }]
        },
        {
            type: "comment", name: "firstcomputer", title: "Please tell us about your first computer", isRequired: true,
            validators: [{type:"text", minLength:20}]
        }
    ]
});
survey.onComplete.add(function(result) {
	document.querySelector('#surveyResult').innerHTML = "result: " + JSON.stringify(result.data);
});

function isNumber(n) { return n && !isNaN(parseFloat(n)) && isFinite(n); }    
   
function surveyValidateQuestion(s, options) {
    if (options.name == 'pricelimit') {
        var leastamount = options.value['leastamount'];
        var mostamount = options.value['mostamount'];
        if(leastamount > mostamount) {
            options.error = "The 'most amount' should be more 'less amount'.";
        }
    }
    if (options.name == 'firstcomputer') {
        if(options.value.indexOf('computer') < 0) {
            options.error = "Please type the word 'computer'.";
        }
    }
}


$("#surveyElement").Survey({
    model: survey,
    onValidateQuestion: surveyValidateQuestion
});



<!DOCTYPE html>
<html>

<head>
    <title>Welcome to JQuery</title>
    <script src="https://unpkg.com/jquery"></script>
    
    <script src="https://surveyjs.azureedge.net/0.12.18/survey.jquery.js"></script>
    
    
    <link rel="stylesheet" href="https://unpkg.com/bootstrap@3.3.7/dist/css/bootstrap.min.css">
    <link rel="stylesheet" href="./index.css">
</head>

<body>
    <div id="surveyElement"></div>
    <div id="surveyResult"></div>
    <script src="./index.js"></script>
</body>

</html>

.btn-green {
  background-color: #1ab394;
  color: #fff;
  border-radius: 3px;
}

.btn-green:hover, .btn-green:focus {
    background-color: #18a689;
    color: #fff;
}

.panel-footer {
    text-align: right;
    background-color: #fff;
}