操作系统选择题·七

1. _____ is the concept in which a process is copied into main memory from the secondary memory according to the requirement.

   A. Paging

   B. Demand paging

   C. Segmentation

   D. Swapping

   
   答案：B

2. The pager concerns with the:

   A. individual page of a process

   B. entire process

   C. entire thread

   D. first page of a process

   
   答案：A

3. Swap space exists in:

   A. primary memory

   B. secondary memory

   C. CPU

   D. none of the mentioned

   
   答案：B

4. When a program tries to access a page that is mapped in address space but not loaded in physical memory, then?

   A. segmentation fault occurs

   B. fatal error occurs

   C. page fault occurs

   D. no error occurs

   
   答案：C

5. Effective access time is directly proportional to:

   A. page-fault rate

   B. hit ratio

   C. memory access time

   D. none of the mentioned

   
   答案：A

6. In FIFO page replacement algorithm, when a page must be replaced:

   A. oldest page is chosen

   B. newest page is chosen

   C. random page is chosen

   D. none of the mentioned

   
   答案：A

7. Which algorithm chooses the page that has not been used for the longest period