I have created a offline paper wallet today and deposited some btc in it and save that paper wallet to my pen drive plus take out a print of it.
Will my paper wallet become safe ?
Nothing is 100% safe but you've taken precautions. Creating it offline is good practice. You should be fine, maybe laminate the paper wallet & hide it somewhere.
I created my paper wallets offline, every now & again I type the public keys into a block explorer to check the balances & 'all ok' so far.
My computer where I have generated it , it have Net protecter Anti virus . So, if I access internet on my pc, is there any chances to get my private key get revealed ? I don't have much experience using paper wallet .
The type of Anti-virus you use, does not give you 100% protection against all backdoors or Trojan Horse or key loggers. None of them are 100% safe, even if they say so.
Go to a second hand shop, if you do not have a old computer and buy the cheapest computer you can get. Go to bitaddress.org and save the page as a complete webpage on a flash drive on your primary computer. Then transfer these files to the old cheap computer you bought, and open the file offline. <Do not connect that computer to the internet> Create as many paper wallets as you might need from that computer, and physically destroy the harddrive, after you print it.
If you will not go onto the internet with that computer ever again, you could still keep it, to print more for your friends and family. I got a old computer and a printer from a friend, that they wanted to throw away. So I paid nothing for it.
It might sound a bit overkill, but if you are going to store say 10 000 Bitcoins in a paper wallet... you will not be bothered to spend say $20 on a old outdated computer for this purpose.
Keep the paper wallets laminated and a copy in another location in a safe place.