Hi Satya Nayak!

I will be listing out few websites which provide you with NATA question papers:

1) http://www.shiksha.com/architecture-planning/nata-exam-question-papers

2) http://www.recruitmenthunt.com/nata-previous-papers

3) http://www.getmyuni.com/exams/nata-previous-years-papers

4) http://www.embibe.com/exams/nata-previous-year-question-papers/

I hope these websites are enough for your preperation!

Good Luck!