Salam
Me an electrical engineer, MS from NED. As per my knowledge you needed B.E for admission in MS. After B.Tech you may proceed for B.Tech honours and then for M. Tech or you may join the conversion course in a university. This conversion course in conducted after completion of B.Tech. Initially you will study for two years in seperate classes and after successful completion of these two years you will be admitted in the third year of regular B.E program.

However, my advise is complete B.Tech honours and then take admission in MS (Applied Physics) by this way you will be eligible to apply for higher posts in Govt. and private sector.

__________________
Aoa ak sajda karen aalam-e-madhoshi me
Log kehte hen k saghar ko KHUDA yad nahi