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Welcome to the Virtual Memory MCQs Page

Dive deep into the fascinating world of Virtual Memory with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of Virtual Memory, a crucial aspect of Operating System. In this section, you will encounter a diverse range of MCQs that cover various aspects of Virtual Memory, from the basic principles to advanced topics. Each question is thoughtfully crafted to challenge your knowledge and deepen your understanding of this critical subcategory within Operating System.

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Check out the MCQs below to embark on an enriching journey through Virtual Memory. Test your knowledge, expand your horizons, and solidify your grasp on this vital area of Operating System.

Note: Each MCQ comes with multiple answer choices. Select the most appropriate option and test your understanding of Virtual Memory. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

Virtual Memory MCQs | Page 2 of 5

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Q11.
What is a page fault ?

a.

is an spelling error in a page in memory

b.

is a reference to a page which is in another program

c.

is an access to a page not currently in memory

d.

always occurs whenever a page is accessed

Discuss
Answer: (c).is an access to a page not currently in memory
Q12.
Dirty bit is used to show

a.

Page with corrupted data

b.

Wrong page in memory

c.

Page that is modified after being loaded in the cache memory

d.

page that is less frequently accessed

Discuss
Answer: (c).Page that is modified after being loaded in the cache memory
Q13.
Size of virtual memory depends on

a.

size of data bus

b.

size of address bus

c.

size of main memory

d.

none of above

Discuss
Answer: (b).size of address bus
Q14.
A program is executing in a pure demand paging system with 100 records per page with 1 free main memory frame. The address sequence that is generated by tracing this program is recorded as follows,
0100, 0200, 0430, 0499, 0510, 0530, 0560, 0120, 0220, 0240, 0260, 0320, 0370
What are the number of page faults?

a.

8

b.

11

c.

7

d.

12

Discuss
Answer: (c).7
Q15.
If hardware does not support _________ then a multi - user and multi - processing operating system cannot be implemented.

a.

At least two modes of CPU execution

b.

Demand paging

c.

DMA for disk transfer

d.

Address translation

Discuss
Answer: (b).Demand paging
Q16.
Consider a virtual memory system that uses First In First Out (FIFO) page replacement policy and it allocates a fixed number of frames to a process. Consider the following two statements,

1: Sometimes the page fault rate is increased if the number of page frames allocated is increased.
2: Some programs do not exhibit Locality of reference.

Which of the following is true?

a.

1 is false and 2 is true

b.

both 1 and 2 are false

c.

both 1 and 2 are true but 2 is not the reason for 1

d.

both 1 and 2 are true and 2 is the reason for 1

Discuss
Answer: (c).both 1 and 2 are true but 2 is not the reason for 1
Q17.
Why do we translate a virtual address to physical address where a multilevel page table is preferred in comparison to a single level page table?

a.

It is required by the translation look-aside buffer

b.

It helps to reduce the memory access time to read or write a memory location

c.

It helps to reduce the number of page faults in page replacement algorithm

d.

It helps to reduce the size of a page table needed to implement the virtual address space of a process

Discuss
Answer: (d).It helps to reduce the size of a page table needed to implement the virtual address space of a process
Q18.
What is the impact of thrashing?

a.

It improves system performance

b.

It implies excessive page I/O

c.

It decreases the degree of multiprogramming

d.

It reduces page I/O

Discuss
Answer: (c).It decreases the degree of multiprogramming
Q19.
Memory utilization factor shall be computed as follows

a.

memory in use/allocated memory

b.

memory in use/total memory connected.

c.

memory allocated/free existing memory

d.

memory committed/total memory available.

Discuss
Answer: (b).memory in use/total memory connected.
Q20.
Which of the following is not a key piece of information, stored in single page table entry, assuming pure paging and virtual memory

a.

Frame number

b.

A bit indicating whether the page is in physical memory or on the disk

c.

A reference for the disk block that stores the page

d.

None of the above

Discuss
Answer: (c).A reference for the disk block that stores the page
Page 2 of 5

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