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

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

Belady anamoly occurs in
Optimal replacement
FIFO
LRU
both in FIFO and LRU

Disk scheduling includes deciding
which should be accessed next
order in which disk access requests must be serviced
the physical location of the file
the logical location of the file

Which one is true
The linkage editor is used to edit programs which have to later link together
The linkage editor links object module during compiling
The linkage editor links objects modules and resolves external references between them before loading
none of above

If the property of locality of reference is well pronounced in a program
the number of page faults will be more
the number of page faults will be less
the number of page faults will same
none of above

Main function of shared memory is:
to use primary memory efficently
to do intra process communication
to do inter process communication
none of above

Which of following is not a condition of Dead Lock ?
Mutual Exclusion
No Preemption
Hold and Wait
Data Transfer

A hardware device which is capable of executing a sequence of instructions, is known as
CPU
ALU
CU
Processor

Root directory of a disk should be placed
at the fixed address in the main memory
at a fixed location on the disk
at the fixed location on system disk
anywhere on the disk

Which is non pre-emptive
Round robin
FIFO
MQS
MQSF

Scissoring enables
a part of data to be displayed
entire data to be displayed
full data display on fulll area of sceen
no data display

A series of statements explaining how the data is to be processed is called
instruction
compiler
program
interpretor

Daisy chain is a device for
connecting a number of controllers to a device
connecting a number of device to a controller
all of above
none of above

Remote computing services involves the use of timesharing and
multiprocessing
interactive processing
batch processing
real time processing

Four necessary conditions for deadlock are non pre-emption, circular wait, hold and wait and
mutual exclusion
race condition
buffer overflow
None of above

Poor response times are caused by
Busy processor
High I/O rate
High paging rates
Any of above

Dynamic allocation of storage areas with VSAM files is accomplished by
hashing
control splits
over flow areas
relative recording

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