操作系统选择题库答案及详解_Multiple Choice Questions 9

Multiple Choice Questions 9

Question1
The type of scheduling that involves the decision to add a process to those that are at least partially in main memory and therefore available for execution is referred to as:
选择一个答案

a. Medium-term scheduling √

b. None of the above

c. Long-term scheduling

d. I/O scheduling

Question2
One difficulty with the Shortest Process Next (SPN) scheduling technique is:
选择一个答案

a. All of the above √

b. The lack of preemption

c. The need to know or estimate required processing times for each process

d. The starvation of longer processes

Question3
One difficulty with the Shortest Remaining Time (SRT) scheduling technique is:
选择一个答案

a. The lack of preemption

b. The starvation of shorter processes

c. The need to know or estimate required processing times for each process √

d. All of the above

Question4
Which of the following scheduling policies require prior knowledge or estimation of process length:
选择一个答案

a. Highest Response Ratio Next (HRRN)

b. Shortest Remaining Time (SRT)

c. Shortest Process Next (SPN)

d. All of the above √

Question5
It is impossible to make definitive comparisons of various scheduling policies due to dependence on factors such as:
选择一个答案

a. The probability distribution of service times of the various processes

b. The efficiency of the scheduling and context switching mechanisms

c. All of the above √

d. The nature of the I/O demand and performance of the I/O subsystem

Question6
The strategy that schedules processes based on their group affiliation is generally referred to as:
选择一个答案

a. Fair share scheduling √

b. All of the above

c. Simulation modeling

d. Queuing analysis

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Question7
The traditional UNIX scheduler divides processes into fixed bands of priority levels, with the highest priority band being the:
选择一个答案

a. User process band

b. None of the above

c. File manipulation band

d. Swapper band √

Question8
The decision as to which job to admit to the system next can be based on which of the following criteria:
选择一个答案

a. Priority

b. Simple FIFO

c. I/O requirements

d. All of the above √

Question9
Typically, the swapping-in function for processes is based on the need to manage:
选择一个答案

a. Virtual memory

b. The degree of multiprogramming √

c. None of the above

d. Process priorities

Question10
In terms of frequency of execution, the short-term scheduler is usually the one that executes:
选择一个答案

a. Least frequently

b. None of the above

c. About the same as the other schedulers

d. Most frequently √

Question11
Response time in an interactive system is an example of:
选择一个答案

a. System-oriented criteria for short-term scheduling policies

b. None of the above

c. User-oriented criteria for short-term scheduling policies √

d. System-oriented criteria for long-term scheduling policies

Question12
A typical way to overcome starvation of lower-priority processes in a priority-based scheduling system is to:
选择一个答案

a. Round-robin cycling of processes in a priority queue

b. All of the above

c. Change a process priority randomly

d. Change a process priority with its age √

Question13
Which of the following scheduling policies allow the O/S to interrupt the currently running process and move it to the Ready state?
选择一个答案

a. First-come-first-served

b. Non-Preemptive

c. None of the above

d. Preemptive √

Question14
In terms of the queuing model, the total time that a process spends in a system (waiting time plus service time) is called:
选择一个答案

a. None of the above

b. Normalized turnaround time (TAT)

c. Turnaround or residence time (TAT) √

d. Finish time (FT)

Question15
In the Round Robin scheduling technique, the principle design issue is:
选择一个答案

a. Determining the fair distribution of time quanta to individual processes

b. Determining the length of the time quantum √

c. None of the above

d. Determining the method of cycling through a given set of processes