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<!DOCTYPE html>
<html>
<head>
<title>Untitled</title>
<meta charset="utf-8">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<script>
$(function() {
$(".bg").each(function(c, a) {
var b = $("input", a);
$(a).on("click", "input", function(a) {
$(this).addClass("bl");
b.prop("disabled", 1 < b.filter(".bl").length)
})
})
});
</script>
</head>
<body>
<p> ПЕРВЫЙ БЛОК </p><div class="bg">
<input type="radio" name="t1" id="q1" /><label for="q1">1</label><br />
<input type="radio" name="t1" id="q2" /><label for="q2">2</label><br />
<input type="radio" name="t1" id="q3"/><label for="q3">3</label><br />
<input type="radio" name="t1" id="q4" /><label for="q4">4</label><br />
<input type="radio" name="t1" id="q5" /><label for="q5">5</label><br />
</div>
<p> ВТОРОЙ БЛОК </p><div class="bg">
<input type="radio" name="t2" id="q11" /><label for="q11">1</label><br />
<input type="radio" name="t2" id="q22" /><label for="q22">2</label><br />
<input type="radio" name="t2" id="q33"/><label for="q33">3</label><br />
<input type="radio" name="t2" id="q44" /><label for="q44">4</label><br />
<input type="radio" name="t2" id="q55" /><label for="q55">5</label><br />
</div>
</body>
</html>