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Home
Questions & Answer
Technology Questions & Answers
Operating System Questions & Answers
Operating System Questions & Answers
(Compiled from UPSC, SSC ,PSC ,IBPS previous question papers)
Macintosh computer uses
A
System 7.0
B
AU/X
C
Xenix
D
none of above
Which operating system reacts in the actual time
A
Batch system
B
Quick response system
C
Real time system
D
Time sharing system
Reference bit is used for
A
Implementing LRU page replacement algorithm
B
Implementing NRU algorithm
C
To check the page table entry in the cache memory
D
none of above
Which is single user operating system
A
MS-DOS
B
UNIX
C
XENIX
D
LINUX
In which scheduling policies, context switching never takes place
A
FCFS
B
round robin
C
Shortest job first
D
Pre-empitive
For multiprogramming operating system
A
special support from processor is essential
B
special support from processor is not essential
C
cache memory is essential
D
none of above
Semophores are used to solve the problem of
A
race condition
B
process synchronization
C
mutual exclusion
D
belady problem
Size of virtual memory depends on
A
size of data bus
B
size of address bus
C
size of main memory
D
none of above
In real time OS, which is most suitable scheduling scheme
A
round robin
B
FCFS
C
pre-emptive scheduling
D
random scheduling
Dirty bit is used to show
A
Page with corrupted data
B
Wrong page in memory
C
Page that is modified after being loaded in the cache memory
D
page that is less frequently accessed
Which among following scheduling algorithms give minimum average waiting time
A
FCFS
B
SJF
C
Round robin
D
On priority
Memory protection is normally done by
A
the processor and the associated hardware
B
the operating system
C
the compiler
D
the user program
Which scheduling policy is best suited for time-sharing operating systems
A
Shortest job first
B
Round robin
C
First come first serve
D
Elevator
Belady anamoly occurs in
A
Optimal replacement
B
FIFO
C
LRU
D
both in FIFO and LRU
Disk scheduling includes deciding
A
which should be accessed next
B
order in which disk access requests must be serviced
C
the physical location of the file
D
the logical location of the file
Which one is true
A
The linkage editor is used to edit programs which have to later link together
B
The linkage editor links object module during compiling
C
The linkage editor links objects modules and resolves external references between them before loading
D
none of above
If the property of locality of reference is well pronounced in a program
A
the number of page faults will be more
B
the number of page faults will be less
C
the number of page faults will same
D
none of above
Main function of shared memory is:
A
to use primary memory efficently
B
to do intra process communication
C
to do inter process communication
D
none of above
Which of following is not a condition of Dead Lock ?
A
Mutual Exclusion
B
No Preemption
C
Hold and Wait
D
Data Transfer
A hardware device which is capable of executing a sequence of instructions, is known as
A
CPU
B
ALU
C
CU
D
Processor
Root directory of a disk should be placed
A
at the fixed address in the main memory
B
at a fixed location on the disk
C
at the fixed location on system disk
D
anywhere on the disk
Which is non pre-emptive
A
Round robin
B
FIFO
C
MQS
D
MQSF
Scissoring enables
A
a part of data to be displayed
B
entire data to be displayed
C
full data display on fulll area of sceen
D
no data display
A series of statements explaining how the data is to be processed is called
A
instruction
B
compiler
C
program
D
interpretor
Daisy chain is a device for
A
connecting a number of controllers to a device
B
connecting a number of device to a controller
C
all of above
D
none of above
Remote computing services involves the use of timesharing and
A
multiprocessing
B
interactive processing
C
batch processing
D
real time processing
Four necessary conditions for deadlock are non pre-emption, circular wait, hold and wait and
A
mutual exclusion
B
race condition
C
buffer overflow
D
None of above
Poor response times are caused by
A
Busy processor
B
High I/O rate
C
High paging rates
D
Any of above
Dynamic allocation of storage areas with VSAM files is accomplished by
A
hashing
B
control splits
C
over flow areas
D
relative recording
To avoid the race condition, the number of processes that may be simultaneously inside the critical section is
A
12
B
3
C
1
D
0
E
Answer A
1
2
3
4
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