Operating System Mcqs

Page No. 88

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 is?


a224

✖


b236

✓


c245

✖


d240

✖


View Answer 236

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 is?


a600

✖


b620

✖


c630

✖


d640

✓


View Answer 640

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


athe request will be placed in the queue of pending requests for that drive

✓


bthe request will not be processed and will be ignored completely

✖


cthe request will be not be placed

✖


dnone of the mentioned

✖



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


asystem call to the CPU

✖


bsystem call to the operating system

✓


ca special procedure

✖


dall of the mentioned

✖



An unrecoverable error is known as _________


ahard error

✓


btough error

✖


csoft error

✖


dnone of the mentioned

✖


View Answer hard error

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


asector sparing & forwarding

✓


bforwarding & sector utilization

✖


cbackwarding & forwarding

✖


dsector utilization & backwarding

✖



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.


adestroyed blocks, high level formatting

✖


bbad blocks, partitioning

✖


cbad blocks, low level formatting

✓


ddestroyed blocks, partitioning

✖



Defective sectors on disks are often known as __________


agood blocks

✖


bdestroyed blocks

✖


cbad blocks

✓


dnone of the mentioned

✖


View Answer bad blocks

A disk that has a boot partition is called a _________


astart disk

✖


bend disk

✖


cboot disk

✓


dall of the mentioned

✖


View Answer boot disk

For most computers, the bootstrap is stored in ________


aRAM

✖


bROM

✓


cCache

✖


dTertiary storage

✖


View Answer ROM

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