How to set up radio button validation in php.

Question

<?php

if($_SERVER['REQUEST_METHOD'] == 'POST'){

$error_msg = array();

if(!isset($_POST['question-1-answers'])){

$error_msg[] = " QNo:1 Not Attemted";

}

if(!isset($_POST['question-2-answers'])){

$error_msg[] = " QNo:2 Not Attemted";

}

if(!isset($_POST['question-3-answers'])){

$error_msg[] = " QNo:3 Not Attemted";

}

if(!isset($_POST['question-4-answers'])){

$error_msg[] = " QNo:4 Not Attemted";

}

if(!isset($_POST['question-5-answers'])){

$error_msg[] = " QNo:5 Not Attemted";

}

if(!isset($_POST['question-6-answers'])){

$error_msg[] = " QNo:6 Not Attemted";

}

if(!isset($_POST['question-7-answers'])){

$error_msg[] = " QNo:7 Not Attemted";

}

if(!isset($_POST['question-8-answers'])){

$error_msg[] = " QNo:8 Not Attemted";

}

if(!isset($_POST['question-9-answers'])){

$error_msg[] = " QNo:9 Not Attemted";

}

if(!isset($_POST['question-10-answers'])){

$error_msg[] = " QNo:10 Not Attemted";

}

else{

alert("R U Submit the form");

}

}

 

 

Please Resolve 

 

Thanks So much....