1690 + Mcqs in Operating System Page 17 McqOptions

801.	It is __________ to reread a page from the file system than to write it to swap space and then to reread it from there.
A.	useless
B.	less efficient
C.	more efficient
D.	none of the mentioned
Answer» D. none of the mentioned

Discussion

802.	In UNIX, two per process ________ are used by the kernel to track swap space use.
A.	process tables
B.	swap maps
C.	memory maps
D.	partition maps
Answer» C. memory maps

Discussion

803.	For swap space created in a separate disk partition where no file system or directory structure is placed, _____________ used to allocate and deallocate the blocks.
A.	special routines must be
B.	normal file system routines can be
C.	normal file system routines cannot be
D.	swap space storage manager is
Answer» E.

Discussion

804.	If the swap space is simply a large file, within the file system, ____________ used to create it, name it and allocate its space.
A.	special routines must be
B.	normal file system routines can be
C.	normal file system routines cannot be
D.	swap space storage manager is
Answer» C. normal file system routines cannot be

Discussion

805.	A single swap space ______ reside in two places.
A.	can
B.	cannot
C.	must not
D.	none of the mentioned
Answer» B. cannot

Discussion

806.	Using swap space significantly _________ system performance.
A.	increases
B.	decreases
C.	maintains
D.	does not affect
Answer» C. maintains

Discussion

807.	Virtual memory uses disk space as an extension of _________
A.	secondary storage
B.	main memory
C.	tertiary storage
D.	none of the mentioned
Answer» C. tertiary storage

Discussion

808.	An unrecoverable error is known as _________
A.	hard error
B.	tough error
C.	soft error
D.	none of the mentioned
Answer» B. tough error

Discussion

809.	The scheme used in the above question is known as _______ or ________
A.	sector sparing & forwarding
B.	forwarding & sector utilization
C.	backwarding & forwarding
D.	sector utilization & backwarding
Answer» B. forwarding & sector utilization

Discussion

810.	In SCSI disks used in high end PCs, the controller maintains a list of _________ on the disk. The disk is initialized during ________ formatting which sets aside spare sectors not visible to the operating system.
A.	destroyed blocks, high level formatting
B.	bad blocks, partitioning
C.	bad blocks, low level formatting
D.	destroyed blocks, partitioning
Answer» D. destroyed blocks, partitioning

Discussion

811.	Defective sectors on disks are often known as __________
A.	good blocks
B.	destroyed blocks
C.	bad blocks
D.	none of the mentioned
Answer» D. none of the mentioned

Discussion

812.	A disk that has a boot partition is called a _________
A.	start disk
B.	end disk
C.	boot disk
D.	All of the mentioned
Answer» D. All of the mentioned

Discussion

813.	For most computers, the bootstrap is stored in ________
A.	RAM
B.	ROM
C.	Cache
D.	Tertiary storage
Answer» C. Cache

Discussion

814.	The _______ program initializes all aspects of the system, from CPU registers to device controllers and the contents of main memory, and then starts the operating system.
A.	main
B.	bootloader
C.	bootstrap
D.	rom
Answer» D. rom

Discussion

815.	The two steps the operating system takes to use a disk to hold its files are _______ and ________
A.	partitioning & logical formatting
B.	swap space creation & caching
C.	caching & logical formatting
D.	logical formatting & swap space creation
Answer» B. swap space creation & caching

Discussion

816.	The header and trailer of a sector contain information used by the disk controller such as _________ and _________
A.	main section & disk identifier
B.	error correcting codes (ECC) & sector number
C.	sector number & main section
D.	disk identifier & sector number
Answer» C. sector number & main section

Discussion

817.	The data structure for a sector typically contains :
A.	header
B.	data area
C.	trailer
D.	all of the mentioned
Answer» E.

Discussion

818.	The process of dividing a disk into sectors that the disk controller can read and write, before a disk can store data is known as :
A.	partitioning
B.	swap space creation
C.	low-level formatting
D.	none of the mentioned
Answer» D. none of the mentioned

Discussion

819.	In the ______ algorithm, the disk arm goes as far as the final request in each direction, then reverses direction immediately without going to the end of the disk.
A.	LOOK
B.	SCAN
C.	C-SCAN
D.	C-LOOK
Answer» B. SCAN

Discussion

820.	In the _______ algorithm, the disk head moves from one end to the other , servicing requests along the way. When the head reaches the other end, it immediately returns to the beginning of the disk without servicing any requests on the return trip.
A.	LOOK
B.	SCAN
C.	C-SCAN
D.	C-LOOK
Answer» D. C-LOOK

Discussion

821.	In the ______ algorithm, the disk arm starts at one end of the disk and moves toward the other end, servicing requests till the other end of the disk. At the other end, the direction is reversed and servicing continues.
A.	LOOK
B.	SCAN
C.	C-SCAN
D.	C-LOOK
Answer» C. C-SCAN

Discussion

822.	SSTF algorithm, like SJF __________ of some requests.
A.	may cause starvation
B.	will cause starvation
C.	does not cause starvation
D.	causes aging
Answer» B. will cause starvation

Discussion

823.	On media that use constant linear velocity (CLV), the _____________ is uniform.
A.	density of bits on the disk
B.	density of bits per sector
C.	the density of bits per track
D.	none of the mentioned
Answer» D. none of the mentioned

Discussion

824.	Magnetic tape drives can write data at a speed ________ disk drives.
A.	much lesser than
B.	comparable to
C.	much faster than
D.	none of the mentioned
Answer» C. much faster than

Discussion

825.	Random access in magnetic tapes is _________ compared to magnetic disks.
A.	fast
B.	very fast
C.	slow
D.	very slow
Answer» E.

Discussion

826.	Consider a disk queue with requests for I/O to blocks on cylinders : 98 183 37 122 14 124 65 67 Considering SSTF (shortest seek time first) scheduling, the total number of head movements is, if the disk head is initially at 53 :
A.	224
B.	236
C.	240
D.	245
Answer» C. 240

Discussion

827.	Consider a disk queue with requests for I/O to blocks on cylinders : 98 183 37 122 14 124 65 67 Considering FCFS (first cum first served) scheduling, the total number of head movements is, if the disk head is initially at 53 :
A.	600
B.	620
C.	630
D.	640
Answer» E.

Discussion

828.	If a process needs I/O to or from a disk, and if the drive or controller is busy then :
A.	the request will be placed in the queue of pending requests for that drive
B.	the request will not be processed and will be ignored completely
C.	the request will be not be placed
D.	none of the mentioned
Answer» B. the request will not be processed and will be ignored completely

Discussion

829.	Whenever a process needs I/O to or from a disk it issues a ______________
A.	system call to the CPU
B.	system call to the operating system
C.	a special procedure
D.	all of the mentioned
Answer» C. a special procedure

Discussion

830.	The disk bandwidth is :
A.	the total number of bytes transferred
B.	total time between the first request for service and the completion on the last transfer
C.	the total number of bytes transferred divided by the total time between the first request for service and the completion on the last transfer
D.	none of the mentioned
Answer» D. none of the mentioned

Discussion

831.	______ controller sends the command placed into it, via messages to the _____ controller.
A.	host, host
B.	disk, disk
C.	host, disk
D.	disk, host
Answer» D. disk, host

Discussion

832.	The host controller is :
A.	controller built at the end of each disk
B.	controller at the computer end of the bus
C.	controller at the computer end of the bus
D.	none of the mentioned
Answer» C. controller at the computer end of the bus

Discussion

833.	A floppy disk is designed to rotate ___________ as compared to a hard disk drive.
A.	faster
B.	slower
C.	at the same speed
D.	none of the mentioned
Answer» C. at the same speed

Discussion

834.	When the head damages the magnetic surface, it is known as _________
A.	disk crash
B.	head crash
C.	magnetic damage
D.	all of the mentioned
Answer» C. magnetic damage

Discussion

835.	The time taken for the desired sector to rotate to the disk head is called :
A.	positioning time
B.	random access time
C.	seek time
D.	rotational latency
Answer» E.

Discussion

836.	The time taken to move the disk arm to the desired cylinder is called the :
A.	positioning time
B.	random access time
C.	seek time
D.	rotational latency
Answer» D. rotational latency

Discussion

837.	The set of tracks that are at one arm position make up a ___________
A.	magnetic disks
B.	electrical disks
C.	assemblies
D.	cylinders
Answer» E.

Discussion

838.	The heads of the magnetic disk are attached to a _____ that moves all the heads as a unit.
A.	spindle
B.	disk arm
C.	track
D.	none of the mentioned
Answer» C. track

Discussion

839.	In _______ information is recorded magnetically on platters.
A.	magnetic disks
B.	electrical disks
C.	assemblies
D.	cylinders
Answer» B. electrical disks

Discussion

840.	A process is moved to wait queue when I/O request is made with
A.	non-blocking I/O
B.	blocking I/O
C.	asynchronous I/O
D.	synchronous I/O
Answer» C. asynchronous I/O

Discussion

841.	Which one of the following connects high-speed high-bandwidth device to memory subsystem and CPU.
A.	Expansion bus
B.	PCI bus
C.	SCSI bus
D.	None of the mentioned
Answer» B. PCI bus

Discussion

842.	Which buffer holds the output for a device?
A.	spool
B.	output
C.	status
D.	magic
Answer» B. output

Discussion

843.	The device-status table contains
A.	each I/O device type
B.	each I/O device address
C.	each I/O device state
D.	all of the mentioned
Answer» E.

Discussion

844.	Which hardware triggers some operation after certain programmed count?
A.	programmable interval timer
B.	interrupt timer
C.	programmable timer
D.	none of the mentioned
Answer» B. interrupt timer

Discussion

845.	Device drivers are implemented to interface
A.	character devices
B.	block devices
C.	network devices
D.	All of the mentioned
Answer» E.

Discussion

846.	When hardware is accessed by reading and writing to the specific memory locations, then it is called
A.	port-mapped I/O
B.	controller-mapped I/O
C.	bus-mapped I/O
D.	none of the mentioned
Answer» E.

Discussion

847.	The host sets _____ bit when a command is available for the controller to execute.
A.	write
B.	status
C.	command-ready
D.	control
Answer» D. control

Discussion

848.	The data-in register of I/O port is
A.	Read by host to get input
B.	Read by controller to get input
C.	Written by host to send output
D.	Written by host to start a command
Answer» B. Read by controller to get input

Discussion

849.	I/O hardware contains
A.	Bus
B.	Controller
C.	I/O port and its registers
D.	All of the mentioned
Answer» E.

Discussion

850.	When a client has a cascading mount, _______ server(s) is/are involved in a path name traversal.
A.	at least one
B.	more than one
C.	more than two
D.	more than three
Answer» C. more than two

Discussion

Explore topic-wise MCQs in Technical Programming.

It is __________ to reread a page from the file system than to write it to swap space and then to reread it from there.

In UNIX, two per process ________ are used by the kernel to track swap space use.

For swap space created in a separate disk partition where no file system or directory structure is placed, _____________ used to allocate and deallocate the blocks.

If the swap space is simply a large file, within the file system, ____________ used to create it, name it and allocate its space.

A single swap space ______ reside in two places.

Using swap space significantly _________ system performance.

Virtual memory uses disk space as an extension of _________

An unrecoverable error is known as _________

The scheme used in the above question is known as _______ or ________

In SCSI disks used in high end PCs, the controller maintains a list of _________ on the disk. The disk is initialized during ________ formatting which sets aside spare sectors not visible to the operating system.

Defective sectors on disks are often known as __________

A disk that has a boot partition is called a _________

For most computers, the bootstrap is stored in ________

The _______ program initializes all aspects of the system, from CPU registers to device controllers and the contents of main memory, and then starts the operating system.

The two steps the operating system takes to use a disk to hold its files are _______ and ________

The header and trailer of a sector contain information used by the disk controller such as _________ and _________

The data structure for a sector typically contains :

The process of dividing a disk into sectors that the disk controller can read and write, before a disk can store data is known as :

In the ______ algorithm, the disk arm goes as far as the final request in each direction, then reverses direction immediately without going to the end of the disk.

In the _______ algorithm, the disk head moves from one end to the other , servicing requests along the way. When the head reaches the other end, it immediately returns to the beginning of the disk without servicing any requests on the return trip.

In the ______ algorithm, the disk arm starts at one end of the disk and moves toward the other end, servicing requests till the other end of the disk. At the other end, the direction is reversed and servicing continues.

SSTF algorithm, like SJF __________ of some requests.

On media that use constant linear velocity (CLV), the _____________ is uniform.

Magnetic tape drives can write data at a speed ________ disk drives.

Random access in magnetic tapes is _________ compared to magnetic disks.

Consider a disk queue with requests for I/O to blocks on cylinders : 98 183 37 122 14 124 65 67 Considering SSTF (shortest seek time first) scheduling, the total number of head movements is, if the disk head is initially at 53 :

Consider a disk queue with requests for I/O to blocks on cylinders : 98 183 37 122 14 124 65 67 Considering FCFS (first cum first served) scheduling, the total number of head movements is, if the disk head is initially at 53 :

If a process needs I/O to or from a disk, and if the drive or controller is busy then :

Whenever a process needs I/O to or from a disk it issues a ______________

The disk bandwidth is :

______ controller sends the command placed into it, via messages to the _____ controller.

The host controller is :

A floppy disk is designed to rotate ___________ as compared to a hard disk drive.

When the head damages the magnetic surface, it is known as _________

The time taken for the desired sector to rotate to the disk head is called :

The time taken to move the disk arm to the desired cylinder is called the :

The set of tracks that are at one arm position make up a ___________

The heads of the magnetic disk are attached to a _____ that moves all the heads as a unit.

In _______ information is recorded magnetically on platters.

A process is moved to wait queue when I/O request is made with

Which one of the following connects high-speed high-bandwidth device to memory subsystem and CPU.

Which buffer holds the output for a device?

The device-status table contains

Which hardware triggers some operation after certain programmed count?

Device drivers are implemented to interface

When hardware is accessed by reading and writing to the specific memory locations, then it is called

The host sets _____ bit when a command is available for the controller to execute.

The data-in register of I/O port is

I/O hardware contains

When a client has a cascading mount, _______ server(s) is/are involved in a path name traversal.

The scheme used in the above question is known as _ or __

In SCSI disks used in high end PCs, the controller maintains a list of _ on the disk. The disk is initialized during formatting which sets aside spare sectors not visible to the operating system.

The two steps the operating system takes to use a disk to hold its files are _ and __

The header and trailer of a sector contain information used by the disk controller such as _ and _

__ controller sends the command placed into it, via messages to the _ controller.