A gold standard depends on fixed rates.

Bretton Woods mandated fixed rates.  By ending Bretton Woods in 1971, US dollar converted to floating rate (determined by the currency market).



Since 1993, India's currency regime is said to be a managed float, a “market determined exchange rate” in the sense that there is a currency market and the exchange rate is not visibly administratively determined. 

https://www.nipfp.org.in/media/medialibrary/2013/04/wp_2007_49n.pdf&ved=2ahUKEwiOidbrnOeHAxXMmq8BHXZiDzoQFnoECFwQBg&usg=AOvVaw3L6ABmzQ808IpH43pTe1ir

Coinsreporter

Is Rupee a fixed rate or floating rate currency?

econ

Does India still follow Gold Standard for its Currency Indian Rupee (INR)?

Is Rupee a fixed rate or floating rate currency?
