Upvote:6
Assume you will not be let onto the first flight unless you have the right to enter India, as that is the standard for most airlines.
Whether you need to go through passport control, customs (even without hold luggage you may be checked) and check-in and security depends on the actual airport and in some cases the combination of flights.
I am not familiar with the airports in India, but it is quite common world wide to send all passengers on incoming flights through immigration, and have them re-enter the airside of the airport after checking in for the next flight.
You might be lucky and stay airside, but you will still need to be allowed into India, as the airline can not be sure you will be allowed on your next flight and they are responsible for you entering or leaving India.