Kasto Manchhe,

You also asked why our NC is pegged with IC. Himalaya Shamsher, the first governor of Nepal Central Bank, has written about it in his latest book. Apparently, there was a large fluctuation in IC and NC rate, especially around second world war. (You needed to pay somewhere from Rs 60 to Rs 160 in the same month to buy IC 100). Now you can imagine the kind of mayhem such instable regime can cause: people will flock to stock imported salts and garments to avoid having to pay high for them.

To control this chaotic situation, the govt decided to stabilize exchange rate. It was considered almost impossible, (just like we do today, the skeptics used to ask "how could you do it, if your trade deficit is so high? what would you sell to India or where do you get forex to maintain such rate?") Well, so far it has been a success, and as a bonus, we get to see our own sagarmatha and rhino in our notes.

The rest of your questions have been well answered by Hakim_saab. Stay positive and may be, if politics doesn't spin out of control, we are at the cusp of industrialization.