操作系统选择题库答案和详解_Multiple Choice Questions.doc

Multiple Choice Questions 1 Question1 The general role of an operating system is to: 选择一个答案 a. Provide a set of services to system users b. Manage files for application programs c. Act as an interface between various computers d. None of the above Feedback: A. 为系统用户提供一系列服务 B. 为应用程序管理文件(这显然不是) C. 作为多台计算机间的接口(应该是CPU与硬件之间的接口) D. error Question2 Information that must be saved prior to the processor transferring control to the interrupt handler routine includes: 选择一个答案 a. Program Status Word (PSW) Contents of processor registers b. Program Status Word (PSW) c. None of the above d. Program Status Word (PSW) Location of next instruction Feedback: D.程序状态字和下个指令的位置 P14 Question3 One accepted method of dealing with multiple interrupts is to: 选择一个答案 a. Service them in round-robin fashion b. Disable all interrupts except those of highest priority c. None of the above d. Define priorities for the interrupts Feedback: 处理多个中断的方法 P18 The first is to disable interrupts while an interrupt is being processed. A second approach is to define priorities for interrupts and to allow an interrupt of higher priority to cause a lower-priority interrupt handler to be interrupted. A. 轮循服务(显然错误) B. 只服务优先级高的，忽视优先级低的 C. error D. 为这些中断定义优先级 Question4 In a uniprocessor system(单处理器系统), multiprogramming(多道程序设计) increases processor efficiency by: 选择一个答案 a. Taking advantage of time wasted by long wait interrupt handling b. Eliminating all idle processor cycles c. All of the above d. Increasing processor speed Feedback: A.利用等待中断的时间 P18 Question5 As one proceeds down the memory hierarchy (i.e., from inboard memory to offline storage), the following condition(s) apply: 选择一个答案 a. Decreasing capacity b. Increasing access time c. All of the above d. Increasing cost per bit Feedback: A.容量 ↑ B.访问时间 ↑ C.error D.价格 ↓ Question6 Small, fast memory located between the processor and main memory is called 选择一个答案 a. WORM memory b. CD-RW memory c. None of the above d. Cache memory Feedback: D.存储器的层次结构由上至下依次为：寄存器(p