Currently Being ModeratedMar 2, 2012 8:17 AM (in response to shailendrasinh)
There are no charges for free apps. You're just opening an account. If you don't buy anything you won't be charged anything. In addition to Credit Cards, you can also use PayPal, or set up an account without a card following these instructions. You must be at least 13.
iTunes account without credit card:
http://support.apple.com/kb/HT2534Make sure you don't skip over the part about actually trying to buy the free app.