(11). When a process is selected from the ready queue by CPU, its state will change from to A. Ready -> Running B. Ready->Waiting C. Waiting->Running D. Waiting->Ready (12). The basic read/write unit of a normal hard disk is A. blocks B. sectors C. clusters D. bytes (13). Fragmentation means that A. the free memory space left after the memory allocation. B. the unused free memory space. C. the free memory space cannot be used. D. the free memory space is unused and temporarily unavailable. (14). While the program has been compiled or assembled, the program will form a collection which contains machine instructions, and the compiled program called A. source program B. object program C. executable program D. non-executable program (15). can acquire the minimum average time for a given set of processes A. FCFS (First-Come First-Serve) B. SJF (Shortest Job First) C. RR (Round-Robin) D. Multi-Level Queue