i done my Msc in physics so which subject i choose to fill tha NTA UGC NET
As you have completed MSc in physics, then you will obviously have to appear for the NET Physics paper.
On the basis of NET score, you can expect to get a research position (PhD admission) to different colleges/universities all over India and get the Junior Research Fellowship. Another is if you don't clear the JRF then you will get the NET lecturship qualified.
For more information regarding the UGC NET consider the link below:
I hope this helps. Wish you a great day!