WGU C191 DATA TEST & OS FULL STUDY SET QUESTIONS AND CORRECT ANSWERS

What is the role of the OS?: To manage a computer's hardware 2. Which OS service provides functions that are helpful to the user?: Programexecution 3. Which system call is used for device manipulation?: ReadConsole() 4. Which system calls can be grouped under the category of process con-trols?: Allocate, free memory 5. Which service function is responsible for identifying and correcting excep-tions such as the lack of paper in a printer?: Error detection 6. Which type of OS service uses the CLI?: User interface 7. What represents layer zero (0) in the layered approach?: Hardware 8. What is a disadvantage of booting an OS stored in ROM?: Changing abootstrap requires new hardware chips. 9. What is a valid process state?: Waiting 10. What are two valid components of a process control block (PCB)?: Theprocess counter & The process state 11. What isthe difference between kernel and user threads?: Kernel threads aredirectly managed by the operating system, whereas user threads are managed without kernel support. 12. Which advantage does short-term scheduling have compared with long-term scheduling?: It takes less time to select a process to execute next. 13. What is considered stable when the average rate of process creation isequal to the average 3 / 12 departure rate of processes leaving the system?: The degree of multiprogramming 14. Which action allows an application that is in the background to be passedto the foreground and vice versa?: Memory reload 15. What is the process of context switching?: Performing a state save and astate restore 16. Which features are included in the DTrace tool?: Compiler, providers ofprobes, and consumers 17. What is the difference between cooperative and preemptive scheduling?- : Cooperative scheduling occurs when a process terminates, whereas preemptivescheduling occurs when a process initiates. 18. Which scheduling criteria measures the number of processes completedper time unit?: Throughput 19. Which criterion attemptsto keep the processor as busy as possible?: CPUutilization 20. When does starvation occur in the priority scheduling algorithm?: When aprocess is waiting indefinitely 4 / 12 21. Which scheduling algorithm was designed especially for time sharingsystems?: Roundrobin 22. Whatis a difference between soft and hard processor affinity?: Hard affinityspecifies a subset of processors on which a process may run, whereas soft affinity leaves the processor selection to the OS. 23. What is an address that is generated by the CPU?: A logical address 24. Which general-purpose storage is accessed directly by the CPU?: The mainmemory 25. What is a limitation of swapping on mobile systems?: Applications that failto free up sufficient memory are terminated. 26. What is the name of the memory allocation scheme where the operatingsystem keeps a table of available holes?: Variable partition 27. What is described as memory allocated from a fixed-size segment consist-ing of physically contiguous pages?: Buddy system 28. Which memory management solution relocates all available memory intoone variable-sized block?: Compaction 29. What does the 50-percent rule of memory fragmentation state when allo-cating additional memory using the first-fit method?: One-third of all m