os习题

Chapter 1 IntroductionChoose the best answer for the following questions1. What is an operating system?An operating system is a program that manages the computer hardware.2. The goal of a time-sharing operating system pursue is? DA. response immediatelyB. multi-threadC. velocityD. parallel execute3. Which one is not the way to enter kernel mode from user mode?A. A special instruction called a supervise or callB. Traps mechanismC. Interrupts mechanismD. Procedure call4. Which task is not performed by an operating system? DA. Process managementB. Memory managementC. Device managementD. Language management5. Which operating system allows interaction between user and process? CA. Batch mode OSB. Multiprogrammed batch OSC. Time-shared OSD. Real-time OS6.Which of the following instructions should not be privileged?A. Change memory management registersB. Write the program counterC. Change processor priority7.Which one is not the advantages of distributed system? CA. Resource sharingB. ReliabilityC. Not a real-time systemD. Communications8.Which one is not the issue of handheld system? DA. Limited memoryB. Slow processorC. Small display screensD. Not a real-time systemFill in the blanks with appropriate answers:1. The two main functions of an operating system are ------------- and -------------.2. Events that disrupt the normal sequence of instructions executed by the CPU are ---- and ----.Interrupts; traps3. An interruption is a signal sent to the CPU by an ---- device .4. An operating system supports two modes of execution: ----- mode and ---- mode .5. One different between traps and interrupts is traps are ------ , interrupts are and ------ .6. Advantages of parallel system are ------ and ------ and ------ .Answer the following questions briefly1. Write some types of operating system usually used.(at least four types)2. What features needed for multiprogramming in Operating System?3. Description several advantages of parallel system4. Description some advantages of distributed systemChapter 3 Operating-System Structures Choose the best answer for the following questions1. Which is not the I/O system consists of ?A. A buffer-caching systemB. Error DetectionC. A general device-driver interfaceD. Drivers for specific hardware devices2. In the following activities, which one is not the operating system responsible for in connection with disk management ?A. Free space managementB. Storage allocationC. Disk schedulingD. Data storage3. Which one is not the additional function of a Operating System?A. compilerB. Resource allocationC. AccountingD. ProtectionFill in the blanks with appropriate answers1. A process is a ------ in execution .2. A file is a collection of related ------ defined by its creator.3. ------ provide the interface between a running program and the operating system .4. An operating system is far easier to ------ if it is written in a high-level language.5. ------- is a code stored in ROM that is able to locate the kernel, load it into memory,and start its execution .6. Communication may take place using either ------ or shared memory.7. A ------ provides an interface identical to the underlying bare hardware .Answer the following questions briefly1. What activities the operating system is responsible for in connections with filemanagement ?2. What's the main services of a operating system?3.Give the types of System CallsChapter 4 ProcessI. Choose the best answer for the following questions1.What is the process?A. a program.B. a job.C. a program code.D. a program in execution.2.what is the switching states of a process?A. new, ready, running.B. new, running, waiting.C. running, waiting, ready.D. terminated, ready, new.3.what is the possible transition from a process state to another?A. New→terminated.B. Running→swappedC. wait→running.D. Running→ready.4.In a computer with only one CPU inside, actually how many process areexecuted by the CPU?A. 1.B. 2.C. 3.D. N.5.Given a system with n process, how many possible ways can thoseprocesses be scheduled?A. n-2B. n-1C. nD. n+1II. Fill in the blanks with appropriate answers1. A process is program in execution.2. A process’s unique identification number is called process number.3.The three key states of a process transition are running, waiting, ready IV. Answer the following questions briefly.1. What is the principal advantage of multiprogramming?2. Is a non-preemptive scheduling algorithm a good choice for aninteractive system? why?Chapter 5 ThreadsI.Choose the best answer for the following questions1.What is the thread?2. A thread can be category into which of the following kinds:E. Light weight process and heavy weight process.F. Resource hold and resource free.G. Scheduled and unscheduled.H. User threads and kernel threads.3.How many threads can a process own?I. Only one.J. Just Two.K. Ten or below.L. Any.II. Fill in the blanks with appropriate answers1. A does not depend on system kernel.2.If threads exist in a system, the scheduling unit is .3.The model maps each user thread to a corresponding kernel thread.IV. Answer the following questions .What is difference between thread and process.Chapter 6 CPU SchedulingChoose the best answer for the following questions.1．T he goal of a scheduling algorithm is:A. Identify which algorithm can satisfy the user needs.B. Creates new policy for OS.C. Identify the process whose selection will result in the “best” possiblesystem performance.D. None of the above.2．What is the Turnaround Time?3 ．What is the Wait Time?4 ．Which of the following is not scheduling algorithm?E. First-Come First-Served.F. Reader and Writer methods.G. Round Robin.H. Multilevel feedback queues.5．Which criterion is not considered for comparing CPU scheduling algorithms?A. CPU utilizationB. ThroughputC. Waiting timeD. Executive timeIV. Answer the following questions .1.In what way is shortest-job-first scheduling just a particular form of priorityscheduling?Chapter 7 Process synchronizationI. Choose the best answer for the following questions.1.The section of code that require to access shared resources are called:A.Critical region.B.Racing section.C.Race condition.D.Process synchronization.2. A programming language construct that guarantees appropriate accessto critical sections is called:A.Critical region.B.Bounded Use.C.Race condition.D.Monitors3.Which one is not required to a critical-section problem?A. Mutual exclusionB. Busy-waitingC. ProgressD. Bounded waitingII. Fill in the blanks with appropriate answers1．Controlling synchronization by using an abstract data type calleda .2．A semaphore is a semaphore whose count may only take on the values of 1 or 0.Chapter 8 DeadLockI. Choose the best answer for the following questions.4.Process do not release previously granted resources while waiting forpending request to be granted is called:A.Mutual Exclusion.B.Hold and Wait.C.No Preemption.D.Circular Wait5.Previously granted resources may not be taken away from the processesholding them is called:A.Mutual Exclusion.B.Hold and Wait.C.No Preemption.D.Circular Wait.6.Which sequence is the right sequence of a process may use a resource?A. Request, ReleaseB. Request, Use, ReleaseC. Use, ReleaseD. Request, Use, Collect, ReleaseII. Fill in the blanks with appropriate answers1．In the problem of Dining Philosophers, there are five philosophers dining, how many philosophers can eat at the same time at most?Answer: .2．A deadlock will occur if four conditions hold simultaneously in a system, they are: .。