Operating System Questions & Answers (Compiled from UPSC, SSC ,PSC ,IBPS previous question papers)

Which of the following does not interrupt an running process
A device
Timer
Schedular Process
Power failure

Which process is known for initializing a microcomputer with its OS
cold booting
boot recording
booting
warm booting

Which operating system use write through catches
UNIX
XENIX
ULTRIX
DOS

Creating a job queue is a function of
Spooler
Interperator
Complier
Drive

A high paging rate
may cause a high I/O rate
keeps the system running well
is a symptom of too much processor activity
always creates a slow system

A public key encryption system
Allows only the correct sender to decode the data
Allows only the correct receiver to decode the data
Allows anyone to decode the data
none of above

Fragmentation of a file system
occurs only is file is not used properly
can always be prevented
happens in all file systems
can be removed by compaction

Semaphores function is to
synchronize critical resources to prevent deadlock
synchronize processes for better CPU utilization
used for memory management
none of above

Operating system is
A collection of hardware components
A collection of input output devices
A collection of software routines
All of above

Shortest Job First executes first the job
with the least processor needs
that first entered the queue
that has been in the queue for the longest
that last entered the queue

The LRU algorithm
pages out pages that have been used recently
pages out pages that have not been used recently
pages out pages that have been least used recently
pages out the first page in a given area

A thread is
lightweight process where the context switching is low
lightweight process where the context swithching is high
used to speed up paging
used in dead locks

Multiprogramming systems
Are easier to develop than single programming systems
Execute each job faster
Execute more jobs in the same time
Are used only on large main frame computers

The part of machine level instruction, which tells the central processor what has to be done, is
Operation code
Address
Locator
Flip-Flop

Dispatcher function is to
put tasks in I/O wait
schedule tasks in processor
change task priorities
All of above

Which technique is used by operating systems to execute several programs concurrently by switching back and forth
Partitioning
Multitasking
Windowing
Paging
Answer And E

Problem of thrashing is affected significantly by
program structure
program size
primary storage size
all of above

Macintosh computer uses
System 7.0
AU/X
Xenix
none of above

Which operating system reacts in the actual time
Batch system
Quick response system
Real time system
Time sharing system

Reference bit is used for
Implementing LRU page replacement algorithm
Implementing NRU algorithm
To check the page table entry in the cache memory
none of above

Which is single user operating system
MS-DOS
UNIX
XENIX
LINUX

In which scheduling policies, context switching never takes place
FCFS
round robin
Shortest job first
Pre-empitive

For multiprogramming operating system
special support from processor is essential
special support from processor is not essential
cache memory is essential
none of above

Semophores are used to solve the problem of
race condition
process synchronization
mutual exclusion
belady problem

Size of virtual memory depends on
size of data bus
size of address bus
size of main memory
none of above

In real time OS, which is most suitable scheduling scheme
round robin
FCFS
pre-emptive scheduling
random scheduling

Dirty bit is used to show
Page with corrupted data
Wrong page in memory
Page that is modified after being loaded in the cache memory
page that is less frequently accessed

Which among following scheduling algorithms give minimum average waiting time
FCFS
SJF
Round robin
On priority

Memory protection is normally done by
the processor and the associated hardware
the operating system
the compiler
the user program

Which scheduling policy is best suited for time-sharing operating systems
Shortest job first
Round robin
First come first serve
Elevator

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Operating System Question Answers, PSC, UPSC, IBPS, SSC Previous Papers