An old definition identifies computer science as the science of electronic data processing and its fundamentals. But with its continuing development, computer science has vastly outgrown this definition and expanded its area.
Computer science deals with methods to systematically and methodically process information. It originates from aspects related to information technology from fields such as mathematics, linguistics, physics and eletrical engineering. Computer science is much more than just programming and computer code. Thus, it is not surprising can provide you with many ways to specialise yourself in computer science with a wide suite of different degree programmes provide by a diverse set of chairs and professors that conduct research on diverse research topics.
Taking this online self assessment (avaible in German only) for computer science can help you give some insights into typical computer science questions.