Nepali citizenship by naturalisation

2. Is it okay if my maiden name and surname is not changed on the Nepali passport?
You'll get a 'nonresident visa' when you get married. This sticker just goes into your passport, so you don't need to change your name. That would be done in your country.
3. God forbid, if after divorce, does Nepali citizenship continue? Whether divorce or death, you have 5 years to formalize your citizenship or go back or get another kind.
4. Can I take my previous citizenship and passport again in future? It all reverts back anytime your husband doesn't go with you to renew it.
5. If I want to visit other countries, will i be allowed to exit from india on visit visa of other country? I have heard of Nepali girls getting offloaded at airport.
You won't be a Nepali so you'll have rights from both countries, to a certain extent. You won't have to pay to get into UNESCO sites, but that's the biggest perk.
6. My future kid will have Nepali passport. In future can the kid get passport of my original country?
If you have a child that's born in Nepal he/she will be a citizen when he/she turns 16. You could possibly get a family visa if you have a child born here. Please verify this with the Immigration dept. This is just by my experience.