sir, is this true that engineering physics only leads to r&d??and whether engineering physics students are allowed to sit with ece students at time of placements?

NO. it’s not like that engineering Physics provides you a specialization and yes, you may work as a scientist in R & D but it does not mean to confine your chances of growth, you may certainly sit with ECE students at the time of recrutments, mind you, studies never go waste and you get the reward for your education in one form or the other sooner or later. I recommend these institutions to pursue your degree(s) – BITS, Pilani.................Shri Jagdish Prasad Jhabarmal Tibrewala University, Jhunjhunu,.......................Lovely Professional University, Phagwara