Operating System Mcqs

Page No. 66

A virtual memory system uses First In First Out (FIFO) page replacement policy and allocates a fixed number of frames to a process. Consider the following statements.
P : Increasing the number of page frames allocated to a process sometimes increases the page fault rate
Q : Some programs do not exhibit locality of reference Which of the following is TRUE?


aBoth P and Q are true, and Q is the reason for P


bBoth P and Q are true, but Q is not the reason for P


cP is false but Q is true


dBoth P and Q are false



A memory page containing a heavily used variable that was initialized very early and is in constant use is removed, then the page replacement algorithm used is ____________


aLRU


bLFU


cFIFO


dNone of the mentioned


View Answer FIFO

A process refers to 5 pages, A, B, C, D, E in the order : A, B, C, D, A, B, E, A, B, C, D, E. If the page replacement algorithm is FIFO, the number of page frames is increased to 4, then the number of page transfers ____________


adecreases


bincreases


cremains the same


dnone of the mentioned


View Answer increases

A process refers to 5 pages, A, B, C, D, E in the order : A, B, C, D, A, B, E, A, B, C, D, E. If the page replacement algorithm is FIFO, the number of page transfers with an empty internal store of 3 frames is?


a8


b10


c9


d7


View Answer 9

Which of the following page replacement algorithms suffers from Belady’s Anomaly?


aOptimal replacement


bLRU


cFIFO


dBoth optimal replacement and FIFO


View Answer FIFO

The implementation of the LFU and the MFU algorithm is very uncommon because ____________


athey are too complicated


bthey are optimal


cthey are expensive


dall of the mentioned


View Answer they are expensive

What is the reason for using the MFU page replacement algorithm?


aan actively used page should have a large reference count


ba less used page has more chances to be used again


cit is extremely efficient and optimal


dall of the mentioned



What is the reason for using the LFU page replacement algorithm?


aan actively used page should have a large reference count


ba less used page has more chances to be used again


cit is extremely efficient and optimal


dall of the mentioned



The minimum number of page frames that must be allocated to a running process in a virtual memory environment is determined by ____________


athe instruction set architecture


bpage size


cphysical memory size


dnumber of processes in memory



The essential content(s) in each entry of a page table is/are ____________


aVirtual page number


bPage frame number


cBoth virtual page number and page frame number


dAccess right information


View Answer Page frame number

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