Have you already typed Hindi documents with LaTeX?

Yes, I am getting junk characters in it. Please find below sample OMR Sheet

I mean: have you written some hindi documents with LaTeX or XeLaTeX (but outside AMC) that shows the right characters?
AMC is working with LaTeX to produce documents. If you can find LaTeX source documents that works as you need, that could help me to direct you.

The attached source file works with me, with packages fonts-deva and texlive-lang-other installed (not sure they are necessary though).

I tried same but getting errors in command output. Please find below file for the same.

! The font "Nakula" cannot be found.

Did you install the debian package fonts-deva (or equivalent), with the Nakula font?

Yes, Working after installing font.
Thanks.