var bFlag = $('#test2').is(':checked');

// To get the currently selected radio button's id
var id = $("input[@name=testGroup]:checked").attr('id');

// Input has a unique 'value' attribute:
var value = $("input[@name=testGroup]:checked").val();

// Check the checkbox
$("input").attr("checked", "checked");

// Radiobutton value
$('.columns input:radio:checked').val()

Checkbox/RadioButton

jQuery