>I am getting a job offer in India and I am thinking of moving >back. By doing this, am I violating the GC status?
If you give up your residence here, then you lose
your GC.
>I was thinking of visiting US once in 6 months for a couple of >days to make sure that my GC status remains. Is this >adequate?
Not adequate because you treat USA like a tourist spot
rather than your permanent home. A lot fo people
do that but there is a risk that eventually they will
be caught. You should get a re-entry permit, which can
allow you to stay abraod for 2 years.
>Also do I need to pay US taxes on whatever money I earn in >India?
As a PR, You need to report world-wide income to the
IRS, therefore you need to report the money you make in India.
Whether you should pay taxex on them depend upon USA_India
tax treaty.