can anybody suggest any sites where i can study about operation of laboratory equipments , methods .concerned with microbiology, biochemistry, biotechnology in a interactive way

http://www.google.com

 

seriously, anything you need to find, you can find. I've found countless protocols via google.

cant beat a good book - and google, google helps.

A good book for people new too these protocols is

At the Bench: A Laboratory Navigator, Updated Edition From Cold Springs Harbour Laboratory Press.

 

I'd suggest buying it directly from their website as you will be sure to get the most updated version.

 

It's very good for the fields that you mentioned particularly with Molecular biology techniques, cell cultures, Genes and such.

 

You could also find everything on the internet, but sometimes there's just nothing like a nice solid book to flip through.