hello aspirant,

there is no psu's which is hires for physics branch. however for eletronics and instrumentation branch there is some iring but it is really less compare to ece, electrical a, mechanical branches. some psu's are as follows, iocl, mdl, ecil, texas instrument, ongc etc. you may learn some programming languages , it can add some good impact on your resume. but interview questions will be asked from your discipline only.