650+ Operating System (OS) Solved MCQs

These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Computer Science Engineering (CSE) , Information Technology Engineering (IT) , Bachelor of Science in Computer Science FY (BSc CS) , Bachelor of Computer Applications (BCA) , Bachelor of Science in Computer Science (BSc CS) .

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201.	The FCFS algorithm is particularly troublesome for
A.	time sharing systems
B.	multiprogramming systems
C.	multiprocessor systems
D.	operating systems
Answer» B. multiprogramming systems

202.	What is ‘Aging’?
A.	keeping track of cache contents
B.	keeping track of what pages are currently residing in memory
C.	keeping track of how many times a given page is referenced
D.	increasing the priority of jobs to ensure termination in a finite time
Answer» D. increasing the priority of jobs to ensure termination in a finite time

203.	An SJF algorithm is simply a priority algorithm where the priority is
A.	the predicted next cpu burst
B.	the inverse of the predicted next cpu burst
C.	the current cpu burst
D.	anything the user wants
Answer» A. the predicted next cpu burst

204.	Which of the following scheduling algorithms gives minimum average waiting time?
A.	fcfs
B.	sjf
C.	round – robin
D.	priority
Answer» B. sjf

205.	What is an operating system?
A.	collection of programs that manages hardware resources
B.	system service provider to the application programs
C.	interface between the hardware and application programs
D.	all of the mentioned
Answer» D. all of the mentioned

206.	To access the services of operating system, the interface is provided by the
A.	system calls
B.	api
C.	library
D.	assembly instructions
Answer» A. system calls

207.	Which one of the following is not true?
A.	kernel is the program that constitutes the central core of the operating system
B.	kernel is the first part of operating system to load into memory during booting
C.	kernel is made of various modules which can not be loaded in running operating system
D.	kernel remains in the memory during the entire computer session
Answer» C. kernel is made of various modules which can not be loaded in running operating system

208.	Which one of the following error will be handle by the operating system?
A.	power failure
B.	lack of paper in printer
C.	connection failure in the network
D.	all of the mentioned
Answer» D. all of the mentioned

209.	What is the main function of the command interpreter?
A.	to get and execute the next user-specified command
B.	to provide the interface between the api and application program
C.	to handle the files in operating system
D.	none of the mentioned
Answer» A. to get and execute the next user-specified command

210.	In Operating Systems, which of the following is/are CPU scheduling algorithms?
A.	round robin
B.	shortest job first
C.	priority
D.	all of the mentioned
Answer» D. all of the mentioned

211.	If a process fails, most operating system write the error information to a
A.	log file
B.	another running process
C.	new file
D.	none of the mentioned
Answer» A. log file

212.	Which facility dynamically adds probes to a running system, both in user processes and in the kernel?
A.	dtrace
B.	dlocate
C.	dmap
D.	dadd
Answer» A. dtrace

214.	The OS X has
A.	monolithic kernel
B.	hybrid kernel
C.	microkernel
D.	monolithic kernel with modules
Answer» B. hybrid kernel

216.	In operating system, each process has its own
A.	address space and global variables
B.	open files
C.	pending alarms, signals and signal handlers
D.	all of the mentioned
Answer» D. all of the mentioned

218.	What is interprocess communication?
A.	communication within the process
B.	communication between two process
C.	communication between two threads of same process
D.	none of the mentioned
Answer» B. communication between two process

213.	Which one of the following is not a real time operating system?
A.	vxworks
B.	qnx
C.	rtlinux
D.	palm os
Answer» D. palm os

215.	The systems which allow only one process execution at a time, are called
A.	uniprogramming systems
B.	uniprocessing systems
C.	unitasking systems
D.	none of the mentioned
Answer» B. uniprocessing systems

217.	In Unix, Which system call creates the new process?
A.	fork
B.	create
C.	new
D.	none of the mentioned
Answer» A. fork

219.	Which system call can be used by a parent process to determine the termination of child process?
A.	wait
B.	exit
C.	fork
D.	get
Answer» A. wait

220.	The address of the next instruction to be executed by the current process is provided by the
A.	cpu registers
B.	program counter
C.	process stack
D.	pipe
Answer» B. program counter

221.	The number of processes completed per unit time is known as
A.	output
B.	throughput
C.	efficiency
D.	capacity
Answer» B. throughput

222.	Which of the following is not the state of a process?
A.	new
B.	old
C.	waiting
D.	running
Answer» B. old

223.	What is a Process Control Block?
A.	process type variable
B.	data structure
C.	a secondary storage section
D.	a block in memory
Answer» B. data structure

224.	The entry of all the PCBs of the current processes is in
A.	process register
B.	program counter
C.	process table
D.	process unit
Answer» C. process table

225.	What is the degree of multiprogramming?
A.	the number of processes executed per unit time
B.	the number of processes in the ready queue
C.	the number of processes in the i/o queue
D.	the number of processes in memory
Answer» D. the number of processes in memory

650+ Operating System (OS) Solved MCQs

The FCFS algorithm is particularly troublesome for

What is ‘Aging’?

An SJF algorithm is simply a priority algorithm where the priority is

Which of the following scheduling algorithms gives minimum average waiting time?

What is an operating system?

To access the services of operating system, the interface is provided by the

Which one of the following is not true?

Which one of the following error will be handle by the operating system?

What is the main function of the command interpreter?

In Operating Systems, which of the following is/are CPU scheduling algorithms?

If a process fails, most operating system write the error information to a

Which facility dynamically adds probes to a running system, both in user processes and in the kernel?

Which one of the following is not a real time operating system?

The OS X has

The systems which allow only one process execution at a time, are called

In operating system, each process has its own

In Unix, Which system call creates the new process?

What is interprocess communication?

Which system call can be used by a parent process to determine the termination of child process?

The address of the next instruction to be executed by the current process is provided by the

The number of processes completed per unit time is known as

Which of the following is not the state of a process?

What is a Process Control Block?

The entry of all the PCBs of the current processes is in

What is the degree of multiprogramming?

A single thread of control allows the process to perform

What is the objective of multiprogramming?

Which of the following do not belong to queues for processes?

When the process issues an I/O request

What will happen when a process terminates?

What is a long-term scheduler?

If all processes I/O bound, the ready queue will almost always be and the Short term Scheduler will have a to do.

What is a medium-term scheduler?

What is a short-term scheduler?

The primary distinction between the short term scheduler and the long term scheduler is

In a multiprogramming environment

The context of a process in the PCB of a process does not contain

Which of the following need not necessarily be saved on a context switch between processes?

Which of the following does not interrupt a running process?

Which process can be affected by other processes executing in the system?

When several processes access the same data concurrently and the outcome of the execution depends on the particular order in which the access takes place, is called?

If a process is executing in its critical section, then no other processes can be executing in their critical section. This condition is called?

Which one of the following is a synchronization tool?

A semaphore is a shared integer variable

Mutual exclusion can be provided by the

When high priority task is indirectly preempted by medium priority task effectively inverting the relative priority of the two tasks, the scenario is called

Process synchronization can be done on

A monitor is a module that encapsulates

To enable a process to wait within the monitor

Restricting the child process to a subset of the parent’s resources prevents any process from

226.	A single thread of control allows the process to perform
A.	only one task at a time
B.	multiple tasks at a time
C.	only two tasks at a time
D.	all of the mentioned
Answer» A. only one task at a time

227.	What is the objective of multiprogramming?
A.	have a process running at all time
B.	have multiple programs waiting in a queue ready to run
C.	to increase cpu utilization
D.	none of the mentioned
Answer» C. to increase cpu utilization

228.	Which of the following do not belong to queues for processes?
A.	job queue
B.	pcb queue
C.	device queue
D.	ready queue
Answer» B. pcb queue

229.	When the process issues an I/O request
A.	it is placed in an i/o queue
B.	it is placed in a waiting queue
C.	it is placed in the ready queue
D.	it is placed in the job queue
Answer» A. it is placed in an i/o queue

230.	What will happen when a process terminates?
A.	it is removed from all queues
B.	it is removed from all, but the job queue
C.	its process control block is de-allocated
D.	its process control block is never de- allocated
Answer» A. it is removed from all queues

231.	What is a long-term scheduler?
A.	it selects processes which have to be brought into the ready queue
B.	it selects processes which have to be executed next and allocates cpu
C.	it selects processes which heave to remove from memory by swapping
D.	none of the mentioned
Answer» A. it selects processes which have to be brought into the ready queue

232.	If all processes I/O bound, the ready queue will almost always be and the Short term Scheduler will have a to do.
A.	full, little
B.	full, lot
C.	empty, little
D.	empty, lot
Answer» C. empty, little

233.	What is a medium-term scheduler?
A.	it selects which process has to be brought into the ready queue
B.	it selects which process has to be executed next and allocates cpu
C.	it selects which process to remove from memory by swapping
D.	none of the mentioned
Answer» C. it selects which process to remove from memory by swapping

234.	What is a short-term scheduler?
A.	it selects which process has to be brought into the ready queue
B.	it selects which process has to be executed next and allocates cpu
C.	it selects which process to remove from memory by swapping
D.	none of the mentioned
Answer» B. it selects which process has to be executed next and allocates cpu

235.	The primary distinction between the short term scheduler and the long term scheduler is
A.	the length of their queues
B.	the type of processes they schedule
C.	the frequency of their execution
D.	none of the mentioned
Answer» C. the frequency of their execution