They began with easy/simple questions and went from there. I found that they can use your answer to generate their next question(s). For example: "name a few algorithms that you know" - sorting, searching... "name a few sorting algorithms" - quick-sort, merge, heap, bubble, radix... "name a few searching algorithm" - linear, binary search... (then they'd ask another question based on the previous answers you just gave). The same rule applied to any hard skill/programming language I had on my resume. They began simple and expanded. If you don't know an answer, simply tell them. Do not try to b.s your way through an answer, it'll be obvious and it'll only hurt your chances. Expect behavioural questions as well. For example "describe to me a time when...", and it could be anything from - you had to work in a difficult team/group or you had to face a challenge and what you did to try to overcome it.
