Welcome to the forum Sapna,
For BIR curries, off the bone chicken breast is common, so you will probably be cooking bite-sized chunks. These will only take a few minutes to cook (whether you fry them or precook them by boiling them). Don't overcook them because they will become dry and tough. 5 minutes, or so, will suffice. When it's white, all the way through, it is cooked. Chop the largest chunk in half and check.
For larger pieces (e.g. on the bone thighs/wings/breasts), prick them with a fork (or similar) all the way to the bone. If they ooze red liquid, they are not cooked. If they ooze clear liquid, they are cooked.
For whole chickens, etc, you can either use the above method (i.e. pricking) or, better still, use a thermometer to check the internal temperature.