Operating System Mcqs

Page No. 69

Consider the following page reference string.
1 2 3 4 2 1 5 6 2 1 2 3 7 6 3 2 1 2 3 6
For LRU page replacement algorithm with 4 frames, the number of page faults is?


a10


b14


c8


d11


View Answer 10

If the sum of the working – set sizes increases, exceeding the total number of available frames ____________


athen the process crashes


bthe memory overflows


cthe system crashes


dthe operating system selects a process to suspend



If working set window is too large ____________


ait will not encompass entire locality


bit may overlap several localities


cit will cause memory problems


dnone of the mentioned



If working set window is too small ____________


ait will not encompass entire locality


bit may overlap several localities


cit will cause memory problems


dnone of the mentioned



The accuracy of the working set depends on the selection of ____________


aworking set model


bworking set size


cmemory size


dnumber of pages in memory


View Answer working set size

In the working set model, for:
2 6 1 5 7 7 7 7 5 1 6 2 3 4 1 2 3 4 4 4 3 4 3 4 4 4 1 3 2 3
if DELTA = 10, then the working set at time t1 (….7 5 1) is?


a{1, 2, 4, 5, 6}


b{2, 1, 6, 7, 3}


c{1, 6, 5, 7, 2}


d{1, 2, 3, 4, 5}


View Answer {1, 6, 5, 7, 2}

A program is generally composed of several different localities, which _____ overlap.


amay


bmust


cdo not


dmust not


View Answer may

When a subroutine is called ____________


ait defines a new locality


bit is in the same locality from where it was called


cit does not define a new locality


dnone of the mentioned



What is a locality?


aa set of pages that are actively used together


ba space in memory


can area near a set of processes


dnone of the mentioned



Thrashing _______ the CPU utilization.


aincreases


bkeeps constant


cdecreases


dnone of the mentioned


View Answer decreases

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