Qualcomm Hardware Engineer interview questions

Resume shortlisting ->OA->interview . Interview were of three rounds two technical and one Hr round ,in first round they ask tell me about yourself and then they went on to project section, then they ask about tools that I mentioned in resume then two three questions technical, then in final they asked about prefered location took My mobile number

It aws a hard one in the technical interview they asked the questions which were not my domain but i yet to managed the questions. They asked about VLSI , DSA, and OOPS concepts.