Operating System Mcqs

Page No. 63

Swap space exists in ____________


aprimary memory

✖


bsecondary memory

✓


ccpu

✖


dnone of the mentioned

✖


View Answer secondary memory

The pager concerns with the ____________


aindividual page of a process

✓


bentire process

✖


centire thread

✖


dfirst page of a process

✖



_____ is the concept in which a process is copied into the main memory from the secondary memory according to the requirement.


aPaging

✖


bDemand paging

✓


cSegmentation

✖


dSwapping

✖


View Answer Demand paging

Because of virtual memory, the memory can be shared among ____________


aprocesses

✓


bthreads

✖


cinstructions

✖


dnone of the mentioned

✖


View Answer processes

Locality of reference implies that the page reference being made by a process ____________


awill always be to the page used in the previous page reference

✖


bis likely to be one of the pages used in the last few page references

✓


cwill always be one of the pages existing in memory

✖


dwill always lead to page faults

✖



When the page fault rate is low ____________


athe turnaround time increases

✖


bthe effective access time increases

✖


cthe effective access time decreases

✓


dturnaround time & effective access time increases

✖



If the memory access time is denoted by ‘ma’ and ‘p’ is the probability of a page fault (0 <= p <= 1). Then the effective access time for a demand paged memory is ____________


ap x ma + (1-p) x page fault time

✖


bma + page fault time

✖


c(1-p) x ma + p x page fault time

✓


dnone of the mentioned

✖



When a process begins execution with no pages in memory?


aprocess execution becomes impossible

✖


ba page fault occurs for every page brought into memory

✓


cprocess causes system crash

✖


dnone of the mentioned

✖



When a page fault occurs, the state of the interrupted process is ____________


adisrupted

✖


binvalid

✖


csaved

✓


dnone of the mentioned

✖


View Answer saved

the page is not in memory


aa page gives inconsistent data

✖


ba page cannot be accessed due to its absence from memory

✓


ca page is invisible

✖


dall of the mentioned

✖



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Page 63 of 108

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