In my numerous trips to india over the years, ive never had the immigration officer utter a single word to me. They just stamp away. I will say good morning/good evening etc and all i will get from them is a half hearted attempt to acknowledge and shortly after passport is returned.

Just in case your business dealings will have a paper trail, i agree that you should get a business visit just to be on the safe side!

im also pretty sure my last 5 year multiple entry visa to India does not actually specifiy whether its for tourism or business. It just states five years multiple entry category x.

I will try and dig up my old passport and clarify.