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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351.	Binding of instructions and data to memory addresses can be done at
A.	compile time
B.	load time
C.	execution time
D.	all of the mentioned
Answer» D. all of the mentioned

352.	If the process can be moved during its execution from one memory segment to another, then binding must be
A.	delayed until run time
B.	preponed to compile time
C.	preponed to load time
D.	none of the mentioned
Answer» A. delayed until run time

353.	What is Dynamic loading?
A.	loading multiple routines dynamically
B.	loading a routine only when it is called
C.	loading multiple routines randomly
D.	none of the mentioned
Answer» B. loading a routine only when it is called

354.	What is the advantage of dynamic loading?
A.	a used routine is used multiple times
B.	an unused routine is never loaded
C.	cpu utilization increases
D.	all of the mentioned
Answer» B. an unused routine is never loaded

355.	The idea of overlays is to
A.	data that are needed at any given time
B.	enable a process to be larger than the amount of memory allocated to it
C.	keep in memory only those instructions
D.	all of the mentioned
Answer» D. all of the mentioned

356.	The must design and program the overlay structure.
A.	programmer
B.	system architect
C.	system designer
D.	none of the mentioned
Answer» A. programmer

357.	The swaps processes in and out of the memory.
A.	memory manager
B.	cpu
C.	cpu manager
D.	user
Answer» A. memory manager

358.	If binding is done at assembly or load time, then the process be moved to different locations after being swapped out and in again.
A.	can
B.	must
C.	can never
D.	may
Answer» C. can never

359.	In a system that does not support swapping
A.	the compiler normally binds symbolic addresses (variables) to relocatable addresses
B.	the compiler normally binds symbolic addresses to physical addresses
C.	the loader binds relocatable addresses to physical addresses
D.	binding of symbolic addresses to physical addresses normally takes place during execution
Answer» A. the compiler normally binds symbolic addresses (variables) to relocatable addresses

360.	The address generated by the CPU is referred to as
A.	physical address
B.	logical address
C.	neither physical nor logical
D.	none of the mentioned
Answer» B. logical address

361.	The address loaded into the memory address register of the memory is referred to as
A.	physical address
B.	logical address
C.	neither physical nor logical
D.	none of the mentioned
Answer» A. physical address

365.	Swapping requires a
A.	motherboard
B.	keyboard
C.	monitor
D.	backing store
Answer» D. backing store

366.	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

367.	The consists of all processes whose memory images are in the backing store or in memory and are ready to run.
A.	wait queue
B.	ready queue
C.	cpu
D.	secondary storage
Answer» B. ready queue

368.	The time in a swap out of a running process and swap in of a new process into the memory is very high.
A.	context – switch
B.	waiting
C.	execution
D.	all of the mentioned
Answer» A. context – switch

362.	The run time mapping from virtual to physical addresses is done by a hardware device called the
A.	virtual to physical mapper
B.	memory management unit
C.	memory mapping unit
D.	none of the mentioned
Answer» B. memory management unit

363.	The size of a process is limited to the size of
A.	physical memory
B.	external storage
C.	secondary storage
D.	none of the mentioned
Answer» A. physical memory

364.	If execution time binding is being used, then a process be swapped to a different memory space.
A.	has to be
B.	can never
C.	must
D.	may
Answer» D. may

369.	Swapping be done when a process has pending I/O, or has to execute I/O operations only into operating system buffers.
A.	must
B.	can
C.	must never
D.	maybe
Answer» C. must never

370.	Swap space is allocated
A.	as a chunk of disk
B.	separate from a file system
C.	into a file system
D.	all of the mentioned
Answer» A. as a chunk of disk

371.	CPU fetches the instruction from memory according to the value of
A.	program counter
B.	status register
C.	instruction register
D.	program status word
Answer» A. program counter

372.	A memory buffer used to accommodate a speed differential is called
A.	stack pointer
B.	cache
C.	accumulator
D.	disk buffer
Answer» B. cache

373.	Which one of the following is the address generated by CPU?
A.	physical address
B.	absolute address
C.	logical address
D.	none of the mentioned
Answer» C. logical address

374.	Run time mapping from virtual to physical address is done by
A.	memory management unit
B.	cpu
C.	pci
D.	none of the mentioned
Answer» A. memory management unit

375.	Memory management technique in which system stores and retrieves data from secondary storage for use in main memory is called?
A.	fragmentation
B.	paging
C.	mapping
D.	none of the mentioned
Answer» B. paging

650+ Operating System (OS) Solved MCQs

Binding of instructions and data to memory addresses can be done at

If the process can be moved during its execution from one memory segment to another, then binding must be

What is Dynamic loading?

What is the advantage of dynamic loading?

The idea of overlays is to

The must design and program the overlay structure.

The swaps processes in and out of the memory.

If binding is done at assembly or load time, then the process be moved to different locations after being swapped out and in again.

In a system that does not support swapping

The address generated by the CPU is referred to as

The address loaded into the memory address register of the memory is referred to as

The run time mapping from virtual to physical addresses is done by a hardware device called the

The size of a process is limited to the size of

If execution time binding is being used, then a process be swapped to a different memory space.

Swapping requires a

The backing store is generally a

The consists of all processes whose memory images are in the backing store or in memory and are ready to run.

The time in a swap out of a running process and swap in of a new process into the memory is very high.

Swapping be done when a process has pending I/O, or has to execute I/O operations only into operating system buffers.

Swap space is allocated

CPU fetches the instruction from memory according to the value of

A memory buffer used to accommodate a speed differential is called

Which one of the following is the address generated by CPU?

Run time mapping from virtual to physical address is done by

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

The address of a page table in memory is pointed by

Program always deals with

The page table contains

What is compaction?

Operating System maintains the page table for

The main memory accommodates

What is the operating system?

In contiguous memory allocation

The relocation register helps in

The operating system and the other processes are protected from being modified by an already running process because

Transient operating system code is code that

Using transient code, the size of the operating system during program execution.

In fixed size partition, the degree of multiprogramming is bounded by

The first fit, best fit and worst fit are strategies to select a

In internal fragmentation, memory is internal to a partition and

A solution to the problem of external fragmentation is

Another solution to the problem of external fragmentation problem is to

If relocation is static and is done at assembly or load time, compaction

The disadvantage of moving all process to one end of memory and all holes to the other direction, producing one large hole of available memory is

External fragmentation will not occur when?

Sometimes the overhead of keeping track of a hole might be

When the memory allocated to a process is slightly larger than the process, then

Physical memory is broken into fixed-sized blocks called

Logical memory is broken into blocks of the same size called

Every address generated by the CPU is divided into two parts. They are

376.	The address of a page table in memory is pointed by
A.	stack pointer
B.	page table base register
C.	page register
D.	program counter
Answer» B. page table base register

377.	Program always deals with
A.	logical address
B.	absolute address
C.	physical address
D.	relative address
Answer» A. logical address

378.	The page table contains
A.	base address of each page in physical memory
B.	page offset
C.	page size
D.	none of the mentioned
Answer» A. base address of each page in physical memory

379.	What is compaction?
A.	a technique for overcoming internal fragmentation
B.	a paging technique
C.	a technique for overcoming external fragmentation
D.	a technique for overcoming fatal error
Answer» C. a technique for overcoming external fragmentation

380.	Operating System maintains the page table for
A.	each process
B.	each thread
C.	each instruction
D.	each address
Answer» A. each process

381.	The main memory accommodates
A.	operating system
B.	cpu
C.	user processes
D.	all of the mentioned
Answer» A. operating system

382.	What is the operating system?
A.	in the low memory
B.	in the high memory
C.	either low or high memory (depending on the location of interrupt vector)
D.	none of the mentioned
Answer» C. either low or high memory (depending on the location of interrupt vector)

383.	In contiguous memory allocation
A.	each process is contained in a single contiguous section of memory
B.	all processes are contained in a single contiguous section of memory
C.	the memory space is contiguous
D.	none of the mentioned
Answer» A. each process is contained in a single contiguous section of memory

384.	The relocation register helps in
A.	providing more address space to processes
B.	a different address space to processes
C.	to protect the address spaces of processes
D.	none of the mentioned
Answer» C. to protect the address spaces of processes

385.	The operating system and the other processes are protected from being modified by an already running process because
A.	they are in different memory spaces
B.	they are in different logical addresses
C.	they have a protection algorithm
D.	every address generated by the cpu is being checked against the relocation and limit registers
Answer» D. every address generated by the cpu is being checked against the relocation and limit registers