is it possible to buy BTC with cash in India? If yes, How?
Since the few exchanges that were allowing trading for Indian citizens have shut down after the RBI decision, the only way for people to buy/sell bitcoin with cash and kind are P2P exchanges.
1.You can use localbitcoins for posting a trade.
2.You can post a trade in this section for bitcoin and state what price you want to buy at. Some of the members in this section may be able to help you out with a personal trade. Please use an escrow before dealing with users with no trust or whom you have suspicion about.
3.There is a global currency exchange section under "Marketplace" in the main English forum. But same precautions should be applied here to about getting an escrow. That section is lurked by scammers.