Q: Sir plz tell me how to transfer documents, word file PDF to iPad from window computer

There are lots of ways of moving files.

A simple and popular way to copy files and share files amoung your devices.

https://www.dropbox.com/

Using iTunes to transfer files:

http://support.apple.com/kb/HT4094?viewlocale=en_US&locale=en_US

Files Connect -- The swiss army knife of remote file connect

https://itunes.apple.com/us/app/files-connect/id404324302?mt=8

http://www.wondershare.com/pdf/transfer-pdf-to-ipad.html

http://www.bythom.com/pdffaq.htm

 Cheers, Tom