Not to waste our times on this debate of a National Language, there is none mentioned in the constitution of India. Do have a look on it, if you think I am cooking up facts.. :)
Regarding the other point, it was not at all evident from your previous post what you meant, and how it was relevant to my previous post.
Anyways, I perfectly agree that no one can "force" you to learn the local language, but the locals would be happy if you learn their local language. And in turn this would make your stay pleasant, for yourself and the others. URA did not say force the local language upon them. He used the word "voluntarily".