IISC Bangalore does not offer M.tech in Physics, The institute offers M.tech programmes in Aerospace Engineering, Chemical Engineering, Civil Engineering, Computer Science & Engineering, Instrumentation, Mechanical Engineering, Materials Engineering, Microelectronic Systems, Signal Processing, Systems Engineering, Transportation & Infrastructure Engineering,Climate Science, Computational Data Science, Earth Science, Electronic Systems Engineering, Electrical Engineering, Communication & Networks and Nano Science & Engineering.You can also prefer the below given link.

https://www.iisc.ac.in/admissions/m-tech-m-des/

Good Luck!