Operating System Mcqs

Page No. 67

Increasing the RAM of a computer typically improves performance because ____________


aVirtual memory increases


bLarger RAMs are faster


cFewer page faults occur


dNone of the mentioned



Applying the LRU page replacement to the following reference string.
1 2 4 5 2 1 2 4
The main memory can accommodate 3 pages and it already has pages 1 and 2. Page 1 came in before page 2. How many page faults will occur?


a2


b3


c4


d5


View Answer 4

There is a set of page replacement algorithms that can never exhibit Belady’s Anomaly, called ____________


aqueue algorithms


bstack algorithms


cstring algorithms


dnone of the mentioned


View Answer stack algorithms

In the stack implementation of the LRU algorithm, a stack can be maintained in a manner ____________


awhenever a page is used, it is removed from the stack and put on bottom


bthe bottom of the stack is the LRU page


cthe top of the stack contains the LRU page and all new pages are added to the top


dnone of the mentioned



When using counters to implement LRU, we replace the page with the ____________


asmallest time value


blargest time value


cgreatest size


dnone of the mentioned


View Answer smallest time value

________ replacement generally results in greater system throughput.


aLocal


bGlobal


cUniversal


dPublic


View Answer Global

One problem with the global replacement algorithm is that ____________


ait is very expensive


bmany frames can be allocated to a process


conly a few frames can be allocated to a process


da process cannot control its own page – fault rate



_________ replacement allows each process to only select from its own set of allocated frames.


aLocal


bUniversal


cGlobal


dPublic


View Answer Local

_________ replacement allows a process to select a replacement frame from the set of all frames, even if the frame is currently allocated to some other process.


aLocal


bUniversal


cGlobal


dPublic


View Answer Global

With either equal or proportional algorithm, a high priority process is treated ___________ a low priority process.


agreater than


bsame as


clesser than


dnone of the mentioned


View Answer same as

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