Qualcomm Software Developer interview questions

Applied through campus:- Round 1 : aptitude round with negative marking - >asked C output questions, ds , os, networks and ca questions in the technical section. the aptitude section contained some di, logical reasoning and general aptitude questions. Round 2 : Tech interview 1 -> asked which language I was comfortable with. I said C/C++. So they asked questions from OOPs concepts, where static variables are stored, what the running time of search operation in AVL tree was and why it was so. I don't remember the other questions Round 3: Tech Interview 2 -> asked questions related to OS, networks, Bit manipulation and puzzle. what is the differentiating factor between a real time os and a general purplose os? what is the difference between tcp and udp. What is used in youtube buffering (tcp/udp)?? how do you count number of bits set in a number? how do you find if a number is a power of 2. Given a pointer to the node to delete (and no other pointer) how would you delete the whole node's structure. Given a weighing machine and 10 bags, with 1 bag having defective balls, how will you find the bag with defective balls by weighing only once. Round 4: Behavioral questions and future plans