1.Inter process communication. 2.How threads block and wait while other threads execute (Write in pseudo-code). 3.Virtual Memory. 4.Multi Threading. 5.Prime number ,Even Number , Odd Number ,Composite number identifying programs and optimizations. 6.Linux user and kernel mode differences. 7.Create your own string class (Mainly to check my thought process and boundary scenarios handling). 8. Descending , Ascending stack in OS. 9. Code of two process communication with common buffer. 10.Three threads are waiting for I/O , how will you schedule if you dont know which thread will get input. 11.Abstract class, Friend Class , Private Derived Class , Multi threading practical examples. 12. Memory Defragmentation algorithms and techniques. 13. Synchronization between threads. 14. Static initialization fiasco, auto pointer , smart pointers.