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MCQs on Operating System by for Public Service Commission Tests
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MCQs on Operating System by for Public Service Commission Tests
All MCQ for Operating System for test preparation of Public Service Commission, FPSC, PPSC, SPSC, NWFP PSC, Blochistan PSC, CSS, PCS, PMS for Lecturer and Subject Specialist,GAT, GRE (NTS)test

Q No.1 of 10

Fragmentation: _______________


Option 1

fragments of memory words unused in page


Option 2

fragments of memory words used in a page


Option 3

None of these


Option 4

All of these


Q No.2 of 10

_______________ system is a real- time system?


Option 1

online railway reservation


Option 2

Aircraft control 


Option 3

Payroll processing


Option 4

All of these


Q No.3 of 10

_________ state transition that is initiated by the user process itself.


Option 1

ready


Option 2

block


Option 3

wakeup


Option 4

none of the these


Q No.4 of 10

Processes which _____________are called concurrent processes.


Option 1

overlap in time


Option 2

are executed at the same time by processor


Option 3

do not overlap in time


Option 4

none of these


Q No.5 of 10

When _______________ then Page fault occurs


Option 1

the page is not in main memory


Option 2

the page is corrupted by any program


Option 3

All of these


Option 4

none of these


Q No.6 of 10

Example of a SPOOLED device is_______________


Option 1

The primary memory device in a virtual memory system.


Option 2

A line printer used to print the output a number of jobs


Option 3

The terminal used to enter the input data for a program being executed.


Option 4

None of the above 


Q No.7 of 10

Dijkstra’s banking algorithm is used to solve problem of  ___________________ in operating system. 


Option 1

context switching


Option 2

deadlock avoidance


Option 3

mutual exclusion 


Option 4

None of these


Q No.8 of 10

A  set of instructions that access common shared resource which exclude one another in time is call______


Option 1

None critical region


Option 2

Critical region


Option 3

Critical system


Option 4

None of the these


Q No.9 of 10

Necessary conditions for deadlock are


Option 1

Mutual exclusion and partial allocation


Option 2

non-preemption and circular wait


Option 3

none of these


Option 4

All of these


Q No.10 of 10

In paged memory systems, if the page size is increased, then the internal fragmentation generally


Option 1

becomes more 


Option 2

becomes less


Option 3

remain constant


Option 4

All of the these



Correct Answers