1 hr interview mix of technical questions and software questions, HR asked the standard motivation questions and then you get asked some technical questions by the hiring manager. They may ask you to prepare a presentation on your topic and then demonstrated your know how in the area. Otherwise times it can be quite easy, but depends on the hiring manager.

No feedback yet either i was accepted or rejected however i tried many times to contact with the HR to get any information about the interview feedback with no luck

I was hired after 3 phone interviews. In general there will be a phone interview followed by on site interview