Home » mcq » Computer fundamentals » Operating system » A page fault A. is an error is a specific page B. occurs when a program accesses a page of memory C. is an access to a page not currently in memory D. is a reference to a page belonging to another program E. None of the above
is an error is a specific page
occurs when a program accesses a page of memory
is an access to a page not currently in memory
is a reference to a page belonging to another program E. None of the above
Answer is Wrong!
Answer is Right!
The correct answer is: B. occurs when a program accesses a page of memory.
A page fault is an event that occurs when a program tries to access a page of memory that is not currently in physical memory. This can happen if the program has been running for a long time and has used up all of the
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available physical memory, or if the program is trying to access a page that has been swapped out to disk.
When a page fault occurs, the operating system must find a page of memory to replace the page that is being accessed. The operating system can either page out a page from another program, or it can page in a page from disk.
Paging out a page from another program can cause that program to be suspended until the page is paged back in. Paging in a page from disk can take a long time, so it can cause the program to slow down.
Page faults can be a major source of performance problems in computer systems. To reduce the number of page faults, operating systems use a variety of techniques, such as memory management algorithms and virtual memory.
Here is a brief explanation of each option:
- A. is an error is a specific page. This is incorrect because a page fault is not an error. It is simply an event that occurs when a program tries to access a page of memory that is not currently in physical memory.
- C. is an access to a page not currently in memory. This is the correct answer. A page fault occurs when a program tries to access a page of memory that is not currently in physical memory.
- D. is a reference to a page belonging to another program. This is incorrect because a page fault can occur even if the page that is being accessed is owned by the same program that is causing the page fault.
- E. None of the above. This is incorrect because option B is the correct answer.