Qualcomm Interview Question

It started with C questions: -storage classes in C -Dynamic memory allocation -Binary tree and its time complexity -different sorting methods, and asked to explain quick sort, time complexities -what is linked list, what is its time complexity -asked to write atoi function code using screen share Operating Systems: -what is a thread -context switching -inter process communication -preemptive and non preemptive process and other things which I had never heard before and don't even remember.