操作系统选择题库答案及详解_Multiple Choice Questions 7

 

Multiple Choice Questions 7

Question1

The task of subdividing memory between the O/S and processes is performed automatically by the O/S and is called:

选择一个答案

a. All of the above

b. Protection

c. Memory Management √

d. Relocation

内存管理

Question2

A reference to a memory location independent of the current assignment of data to memory is called a:

选择一个答案

a. Absolute address

b. None of the above

c. Logical address √

d. Relative address

逻辑地址的定义

Question3

An actual location in main memory is called a:

选择一个答案

a. Relative address

b. Absolute address √

c. Logical address

d. None of the above

物理地址即绝对地址

Question4

The page table for each process maintains:

选择一个答案

a. None of the above

b. The frame location for each page of the process √

c. The physical memory location of the process

d. The page location for each frame of the process

页号对应帧号

Question5

In a system employing a paging scheme for memory management, wasted space is due to:

选择一个答案

a. Internal fragmentation √

b. Pages and frames of different specified sizes

c. None of the above

d. External fragmentation

固定分区和分页都产生内部碎片

Question6

In a system employing a segmentation scheme for memory management, wasted space is due to:

选择一个答案

a. Internal fragmentation

b. External fragmentation √

c. None of the above

d. Segments of different sizes

动态分区和分段都产生外部碎片

Question7

In a system employing a segmentation scheme for memory management, a process is divided into:

选择一个答案

a. A number of segments which must be of equal size

b. None of the above

c. A number of segments which need not be of equal size √

d. One segment per thread

分段：多个大小不等的块

Question8

The concept of Memory Management satisfies certain system requirements, including:

选择一个答案

a. Relocation

b. Physical organization

c. All of the above √

d. Protection

重定位、保护、共享、逻辑组织、物理组织

Question9

The practice in which a program and data are organized in such a way that various modules can be assigned the same region of memory is called:

选择一个答案

a. Sharing

b. None of the above

c. Overlaying √

d. Relocation

覆盖

Question10

The concept of virtual memory is based on one or both of two basic techniques:

选择一个答案

a. Segmentation and paging √

b. None of the above

c. Overlaying and relocation

d. Segmentation and partitioning

虚拟=>分段分页

Question11

A problem with the largely obsolete Fixed Partitioning memory management technique is that of:

选择一个答案

a. Inefficient use of memory

b. Internal fragmentation

c. Allowing only a fixed number of Processes

d. All of the above √

Question12

The problem of internal fragmentation can be lessened in systems employing a fixed-partition memory management scheme by using:

选择一个答案

a. Unequal size partitions √

b. Random size partitions

c. Equal size partitions

d. None of the above

分段解决内部碎片，但是会引入外部碎片

Question13

In the Dynamic Partitioning technique of memory management, the phenomenon that results in unused blocks of memory outside of existing partitions is called:

选择一个答案

a. Compaction

b. Internal fragmentation

c. None of the above

d. External fragmentation √

动态分区 外部碎片

Question14

In the Dynamic Partitioning technique of memory management, the placement algorithm that chooses the block that is closest in size to the request is called:

选择一个答案

a. All of the above

b. Next-fit

c. First-fit

d. Best-fit √

最佳适配，首次适配，邻近适配

Question15

In the Dynamic Partitioning technique of memory management, the placement algorithm that scans memory from the location of the last placement and chooses the next available block that large enough to satisfy the request is called:

选择一个答案

a. First-fit

b. All of the above

c. Best-fit

d. Next-fit √