Hi,
I am a F-1 Student from India on OPT. I came to US in August 2007.
I started working on OPT from July 2009. My wife is on F-2 Dependent Visa.
1] Should I file my tax return as "Married filling jointly" or " Married filling separately"?
2] Should I file taxes as resident alien or non resident alien?
3] Can I claim my wife as dependent as she is not working/earning or claim any exemptions?

Thanks.

On F1/OPT you are exempt from residency for 5-years. You must file non-resident tax return Form 1040NR or 1040NR-EZ and Form 8843. Your income is not subject to FICA taxes but you must pay federal and state income taxes. On your income you will get deduction based on tax treaty between the U.S. and your country. Your U.S. Tax Return: U.S. Tax Filing Requirements for Non-Residents (http://taxipay.blogspot.com/2008/03/us-tax-filing-requirements-for-non.html)