1.  

What are the different tables present in MySQL, which type of table is generated when we are creating a table in the following syntax:
create table employee (eno int(2),ename varchar(10)) ?

Total 5 types of tables we can create
1. MyISAM
2. Heap
3. Merge
4. INNO DB
5. ISAM

2.  

How AJAX Work ?

JavaScript , hence java script can communicate directly with the server by using the JavaScript XMLHttpRequest Object using this object JavaScript fetch and send data without reloading the page .

Following key word used with Ajax though JavaScript ;
1.XMLHttpRequest create object for browser like Firebox ,Muzilla, opera ,safari and other .

2>Internet explore use ActiveXObject
3>onreadystatechange henceActiveXObjectvar. readyState ==4 means response is ready to send and sent by server hence process complete there values like 1,2 ,3 means ,initialize ,in process etc ..
4.>object .status== 200 means status is ok other wise produce error404

5> for open a file or data use

Object. open("GET","file.php",true)

3.  

Which property needs to be set for script manager control to extend the time before throwing time out expection if no response is received from the server?

AsyncPostBackTimeout Property needs to set which gets or sets a value that indicates the time, in seconds, before asynchronous postback time out if no response is received from the server. < asp:scriptmanager id="scriptManager1" runat="server" asyncpostbackerrormessage="We can not serve your request at this moment.Please try later." asyncpostbacktimeout="36000">< /asp:scriptmanager> The default value of this property is 90 second. We can also set the user defined error message using asyncpostbackerrormessage property (as shown in above code) for time out.