操作系统全英文期末考试题(带答案)

一． 选择题（20分，每题1分） 1. Generally speaking, which one is not the major concern for a operating system in the following four options D the computer the system resources and apply the interface between users program and computer hardware system programming language complier 2. The main disadvantage of batch system is C A. CPU utilization is low B. Can not concurrent C. Lack of interaction D. Low degree of automation 3. A process transs from waiting state to ready state is caused by the B A. Interrupt event B. Process scheduling C. Create a process for a program D. Waiting for some events 4. The concurrent process is refers to C A. The process can be run in parallel B. The process can be run in order C. The process can be run in the same time D. The process can not be interrupted 5. In multi-process system, in order to ensure the integrity of public variables, the processes should be mutually exclusive access to critical areas. The so-called critical area is D A. A buffer B. A date area C. Synchronization mechanism D. A program 6. The orderly use of resources allocation strategy can destroy the condition D to avoid deadlock. A. Mutual exclusive B. Hold and wait C. No preemption D. Circular wait 7. Users applications use the system resources to complete its operation by the support and services of C A. clicking the mouse B. Keyboard command C. System call D. Graphical user interface 8. There are four jobs arrived at the same time and the cution time of each job is 2h. Now they run on one processor at single channel,then the average turnaround time is B 9. the job scheduling algorithms, B is related to the jobs estimated running time. A. FCFS scheduling algorithm B. Short-job-first scheduling algorithm C. High response ratio algorithm D. Balanced scheduling 10. In memory management, the purpose of using the overlay and swapping is C A. Sharing main memory B. Expanding main memory physically C. Saving main memory space D. Improving CPU utilization 11. In the page-replacement algorithm,which one can cause the Belady phenomenon A A. FIFO B. LRU C. CLOCKING D. OPT 12. The following description of the system in safe state,which one is correct B A. It must cause deadlock if the system is in insecure state B. It may cause deadlock if the system is in insecure state C. It may cause deadlock if the system is in secure state D. All are wrong 13. Generally, when we talk aboutMemory Protection, the basic meaning is C A. Prevent hardware memory from damaging B. Prevent program from losing in memory C. Prevent the cross-border call between programs D. Prevent the program from being peeped 14. The actual capacity of virtual memory is equal to B A. The capacity of external memorydisk B. The sum of the capacity of external memory and main memory C. The space that the CPU logical address gives D. The smal