Operating System Mcqs

Page No. 64

The valid – invalid bit, in this case, when valid indicates?


athe page is not legal


bthe page is illegal


cthe page is in memory


dthe page is not in memory


View Answer the page is in memory

Using a pager ____________


aincreases the swap time


bdecreases the swap time


cdecreases the swap time & amount of physical memory needed


dincreases the amount of physical memory needed



A swapper manipulates ___________ whereas the pager is concerned with individual _______ of a process.


athe entire process, parts


ball the pages of a process, segments


cthe entire process, pages


dnone of the mentioned



Segment replacement algorithms are more complex than page replacement algorithms because ____________


aSegments are better than pages


bPages are better than segments


cSegments have variable sizes


dSegments have fixed sizes



Virtual memory is normally implemented by ________


ademand paging


bbuses


cvirtualization


dall of the mentioned


View Answer demand paging

In virtual memory. the programmer __________ of overlays.


ahas to take care


bdoes not have to take care


call of the mentioned


dnone of the mentioned



The ability to execute a program that is only partially in memory has benefits like ____________


aThe amount of physical memory cannot put a constraint on the program


bPrograms for an extremely large virtual space can be created


cThroughput increases


dAll of the mentioned


View Answer All of the mentioned

Error handler codes, to handle unusual errors are ____________


aalmost never executed


bexecuted very often


cexecuted periodically


dnone of the mentioned


View Answer almost never executed

The instruction being executed, must be in ____________


aphysical memory


blogical memory


cphysical & logical memory


dnone of the mentioned


View Answer physical memory

Virtual memory allows ____________


aexecution of a process that may not be completely in memory


ba program to be smaller than the physical memory


ca program to be larger than the secondary storage


dexecution of a process without being in physical memory



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