diff --git a/src/lab/exp11/Quizzes.html b/src/lab/exp11/Quizzes.html
index 38c3ab2..b856d1b 100644
--- a/src/lab/exp11/Quizzes.html
+++ b/src/lab/exp11/Quizzes.html
@@ -89,7 +89,7 @@
 			<!-- =================================================================================================================================== -->
 			<div class="container-fluid"  style="margin-left: 35px; margin-right: 35px;">
 				<h2 class="text-h2-lightblue" style=" margin-bottom: 20px; margin-top: 10px; "><a href="http://vlabs.ac.in/computer-science-and-engineering-labs.html" class="sidebar-a" >Computer Science & Engineering</a> &rarr;<a href="../Introduction.html" class="sidebar-a" >Cryptography Lab</a>&nbsp&rarr;<a href="../List of experiments.html" class="sidebar-a" >List Of Experiments</a><br/></h2>
-					
+						
 					<div class="row">
 						<div class="col-md-2 sidebar-col-2">
 						<!--edit1-->
@@ -110,26 +110,26 @@ <h1 class="text-h2-lightblue">Digital Signatures Scheme</h1><div class="content"
 </li>
 <li>Digital signature uses ______  for generating valid signature
 				<ol class="d">
-<li>Private key </li>
-<li>Public key</li>
-<li>Secret key</li>
-<li>None of the aboove</li>
+<li><input name="quest_643" type="radio" value="Private key "/>Private key </li>
+<li><input name="quest_643" type="radio" value="Public key "/>Public key</li>
+<li><input name="quest_643" type="radio" value="Secret key "/>Secret key</li>
+<li><input name="quest_643" type="radio" value="None of the above "/>None of the above</li>
 </ol>
 </li>
 <li>Verification Algorithm uses ______  for  validating digital signature
 				<ol class="d">
-<li>Private key </li>
-<li>Public key</li>
-<li>Secret key</li>
-<li>None of the aboove</li>
+<li><input name="quest_642" type="radio" value="Private key "/>Private key </li>
+<li><input name="quest_642" type="radio" value="Public key "/>Public key</li>
+<li><input name="quest_642" type="radio" value="Secret key "/>Secret key</li>
+<li><input name="quest_642" type="radio" value="None of the above"/>None of the above</li>
 </ol>
 </li>
 <li>Is digital signature scheme possible without public key cryptography
 				<ol type="d">
-<li>Yes </li>
-<li>No</li>
-<li>May be exist </li>
-<li>None of the aboove</li>
+<li><input name="quest_641" type="radio" value="Yes  "/>Yes </li>
+<li><input name="quest_641" type="radio" value="No "/>No</li>
+<li><input name="quest_641" type="radio" value="May be exist "/>May be exist </li>
+<li><input name="quest_641" type="radio" value="None of the above "/>None of the above</li>
 </ol>
 </li>
 <li>