Operating System Mcqs

Page No. 65

What are the two methods of the LRU page replacement policy that can be implemented in hardware?


aCounters


bRAM & Registers


cStack & Counters


dRegisters


View Answer Stack & Counters

For 3 page frames, the following is the reference string:
7 0 1 2 0 3 0 4 2 3 0 3 2 1 2 0 1 7 0 1
How many page faults does the LRU page replacement algorithm produce?


a10


b15


c11


d12


View Answer 12

LRU page – replacement algorithm associates with each page the ______


atime it was brought into memory


bthe time of that page’s last use


cpage after and before it


dall of the mentioned



Optimal page – replacement algorithm is difficult to implement, because ____________


ait requires a lot of information


bit requires future knowledge of the reference string


cit is too complex


dit is extremely expensive



What is the Optimal page – replacement algorithm?


aReplace the page that has not been used for a long time


bReplace the page that has been used for a long time


cReplace the page that will not be used for a long time


dNone of the mentioned



A FIFO replacement algorithm associates with each page the _______


atime it was brought into memory


bsize of the page in memory


cpage after and before it


dall of the mentioned



The aim of creating page replacement algorithms is to ____________


areplace pages faster


bincrease the page fault rate


cdecrease the page fault rate


dto allocate multiple pages to processes



When a page is selected for replacement, and its modify bit is set ____________


athe page is clean


bthe page has been modified since it was read in from the disk


cthe page is dirty


dthe page has been modified since it was read in from the disk & page is dirty



If no frames are free, _____ page transfer(s) is/are required.


aone


btwo


cthree


dfour


View Answer two

Users _______ that their processes are running on a paged system.


aare aware


bare unaware


cmay unaware


dnone of the mentioned


View Answer are unaware

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