Not sure about India, but in other countries this "automatic revocation" is neither automatic nor permanent (believe it or not)
Also, given it is not a requirement by the US that the recipient give up their other citizenships, they don't care about the other country knowing about it
From what I've read, the Citizenship Act of India specifies that any citizen of India who obtains citizenship of any other country immediately ceases to be a citizen of India. At that point, it is his or her duty to surrender their passport to the nearest Indian mission abroad.
I guess that one could ignore this and keep on using their Indian passport - but doing so would be fraud and criminal misrepresentation.
WARNING
If holder acquires Nationality
of another country, he should
Surrender This Passport
forthwith to the nearest Indian
Mission/Post Abroad. Un-
authorized possession of this
Document shall Constitute an
Offence Punishable under
the Indian Passport Act 1967
Not had this experience to comment on this first hand.
But as an Indian, I guess they ask you to surrender your Passport at the Indian embassy, and then ask you to apply for a PIO(Person of Indian origin) card.
One way is when we enter India at borders, they check out exit dates in system. Usually people who are still indians would have US's some kind of visa. US Citizens will not be able to show any US visa.
There are heavy fines for not self surrendering the indian passport after US Citizenship within 6 months.
Not sure about India, but in other countries this "automatic revocation" is neither automatic nor permanent (believe it or not)
Also, given it is not a requirement by the US that the recipient give up their other citizenships, they don't care about the other country knowing about it