Operating System – Virtual Memory – Demand Paging-1 MCQs

1. The memory of the computer system is considered to consist of page frames, where a page frame is memory area that has the same size as a ____

2. Page frames are numbered from ______Where #frames is the number of page frame of memory

3. Each logical address used in a process is considered to be a pair (p_i,b_i), where p_i  is a page number and b_i  is the byte number in p_i, Each page is of size s And 0 ≤ b_i  < s .The effective memory address of a logical address (p_i,b_i) is computed as follows:

4. Memory allocation information for a process is stored in a _______

5. The page table for a process facilitates implementation of address translation, demand loading, and page replacement operations. Which of the followings are the fields in a page table entry

6. Which of the following field in a page table entry indicates whether the page described by the entry currently exists in memory?

7. Which of the following field in a page table entry indicates which page frame of memory is occupied by the page?

8. Which of the following field in a page table entry indicates how the process may use contents of the page - whether read, write, or execute?

9. Which of the following field in a page table entry indicates information concerning references made to the page white it is in memory?

10. Which of the following field in a page table entry indicates whether the page has been modified while in memory?

11. Which of the following field in a page table entry indicates other useful information concerning the page e.g., its position in the swap space?

12. Which of the following field in the page table entry is also known as presence bit?

13. Which of the following field in the page table entry is also known as dirty bit, and this field is single bit?

14. Which of the following field is used to decide whether a page out operation is needed while replacing the page?

15. Which of the following is the step performed in address translation by the MMU?

16. When a page is not present in the memory ,MMU raises an interrupt called a __________

17. Which of the following operations are performed by the Virtual memory manager when page fault occurs?

18. The virtual memory manager uses a page replacement algorithm to select one of the pages currently in memory for replacement, accesses the page table entry of the selected page to mark it as “not present” in memory and initiates a ________operation for it if the modified bit of its page table entry indicates that it is dirty page.

19. The virtual memory manager initiates a _____ operation to load the required page into the page frame that was occupied by the selected page and it updates the page table entry of the page to record frame number of the page frame, marks the page as “present” and makes provision to resume operation of the process.

20. Page-in and page-out operations are required to implement demand paging constitutes _______

21. Which of the following stands true for Effective memory access time for a process in demand paging?

22. Which of the following stands true for Effective memory access time for a process in demand paging? Where pr₁  = probability that a page exists in memory, t_mem = memory access time , t_pfh = time overhead of page fault handling