Entrance interview for the master's programme starts very surface level, what interests you in the field, why you want to study this, etcetera. Then moves on to a simple question, potentially something like Ohm's law, to see if you have at least the basic understanding. Then a more technical question, more focused on the field you have chosen, will be a semi-open discussion on this point, then interview over, and the interviewer will either reccomend you to the admissions comittee or wont.