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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601.	The backing store is generally a
A.	fast disk
B.	disk large enough to accommodate copies of all memory images for all users
C.	disk to provide direct access to the memory images
D.	all of the mentioned
Answer» D. all of the mentioned

602.	Memory management technique in which system stores and retrieves data from secondary storage for use in main
A.	fragmentation
B.	paging
C.	mapping
D.	None of the mentioned
Answer» B. paging

603.	A Process Control Block(PCB) does not contain which of the following?
A.	Code
B.	Stack
C.	Bootstrap Program
D.	Data
Answer» C. Bootstrap Program

604.	Which of the following condition(s) is/are required for a deadlock to be possible?
A.	mutual exclusion
B.	a process may hold allocated resources while awaiting
C.	no resource can be forcibly removed from a process
D.	All of the mentioned
Answer» D. All of the mentioned

605.	To avoid deadlock
A.	there must be a fixed number of resources to
B.	resource allocation must be done only
C.	all deadlocked processes must be
D.	inversion technique can be used
Answer» A. there must be a fixed number of resources to

606.	What is the mounting of file system?
A.	creating of a filesystem
B.	deleting a filesystem
C.	attaching portion of the file system into a directory
D.	removing the portion of the file system into a directory structure
Answer» C. attaching portion of the file system into a directory

607.	Data cannot be written to secondary storage unless written within a
A.	file
B.	swap space
C.	directory
D.	text format
Answer» A. file

608.	The larger the block size, the the internal fragmentation.
A.	greater
B.	lesser
C.	same
D.	none of the mentioned
Answer» A. greater

609.	With a shared file
A.	actual file exists
B.	there are two copies of the file
C.	the changes made by one person are not reflected to the
D.	the changes made by one person are reflected to the other
Answer» D. the changes made by one person are reflected to the other

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

611.	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

616.	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

617.	Which one of the following is not a real time operating system?
A.	VxWorks
B.	Windows CE
C.	RTLinux
D.	Palm OS
Answer» D. Palm OS

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

619.	The systems which allows 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

612.	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 cannot 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 cannot be loaded in running operating system

613.	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

614.	The main function of the command interpreter is
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

615.	By operating system, the resource management can be done via
A.	time division multiplexing
B.	space division multiplexing
C.	both time and space division multiplexing
D.	none of the mentioned
Answer» C. both time and space division multiplexing

620.	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

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

622.	A process can be terminated due to
A.	normal exit
B.	fatal error
C.	killed by another process
D.	all of the mentioned
Answer» D. all of the mentioned

623.	What is the ready state of a process?
A.	when process is scheduled to run after some execution
B.	when process is unable to run until some task has been completed
C.	when process is using the CPU
D.	none of the mentioned
Answer» A. when process is scheduled to run after some execution

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

625.	A set of processes is deadlock if
A.	each process is blocked and will remain so forever
B.	each process is terminated
C.	all processes are trying to kill each other
D.	none of the mentioned
Answer» A. each process is blocked and will remain so forever

650+ Operating System (OS) Solved MCQs

The backing store is generally a

Memory management technique in which system stores and retrieves data from secondary storage for use in main

A Process Control Block(PCB) does not contain which of the following?

Which of the following condition(s) is/are required for a deadlock to be possible?

To avoid deadlock

What is the mounting of file system?

Data cannot be written to secondary storage unless written within a

The larger the block size, the the internal fragmentation.

With a shared file

What is 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?

The main function of the command interpreter is

By operating system, the resource management can be done via

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

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

The OS X has ____________

The systems which allows 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?

A process can be terminated due to

What is the ready state of a process?

What is interprocess communication?

A set of processes is deadlock if

A process stack does not contain

Which system call returns the process identifier of a terminated child?

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

A Process Control Block(PCB) does not contain which of the following :

The number of processes completed per unit time is known as __________

The state of a process is defined by:

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

The Process Control Block is:

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

The degree of multiprogramming is:

A single thread of control allows the process to perform:

The objective of multiprogramming is to :

Which of the following condition is required for deadlock to be possible?

A system is in the safe state if

The circular wait condition can be prevented by

Which one of the following is the deadlock avoidance algorithm?

What is the drawback of banker’s algorithm?

To avoid deadlock

If the wait for graph contains a cycle :

All unsafe states are :

Physical memory is broken into fixed-sized blocks called ________

Logical memory is broken into blocks of the same size called _________

The __________ is used as an index into the page table.

_____ is the concept in which a process is copied into main memory from the secondary memory according to the requirement.

Linux uses a time-sharing algorithm

626.	A process stack does not contain
A.	Function parameters
B.	Local variables
C.	Return addresses
D.	PID of child process
Answer» D. PID of child process

627.	Which system call returns the process identifier of a terminated child?
A.	wait
B.	exit
C.	fork
D.	get
Answer» A. wait

628.	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

629.	A Process Control Block(PCB) does not contain which of the following :
A.	Code
B.	Stack
C.	Bootstrap program
D.	Data
Answer» C. Bootstrap program

630.	The number of processes completed per unit time is known as __________
A.	Output
B.	Throughput
C.	Efficiency
D.	Capacity
Answer» B. Throughput

631.	The state of a process is defined by:
A.	the final activity of the process
B.	the activity just executed by the process
C.	the activity to next be executed by the process
D.	the current activity of the process
Answer» D. the current activity of the process

632.	Which of the following is not the state of a process?
A.	New
B.	Old
C.	Waiting
D.	Running
Answer» B. Old

633.	The Process Control Block is:
A.	Process type variable
B.	Data Structure
C.	A secondary storage section
D.	A Block in memory
Answer» B. Data Structure

634.	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

635.	The degree of multiprogramming is:
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