CSC 415 OPERATING SYSTEMS ALL UNITS | 632 QUESTIONS AND ANSWERS | 2026 UPDATE
| WITH COMPLETE SOLUTION
I/O subsystem is integrated into process manager, memory manager and file system.
Select one:
True
False - (ANSWER)False
Device drivers
Select one:
a. manage only the basic I/O hardware elements
b. manage only the newly emerging I/O devices that are unlike previous devices
c. All the other answers
d. present a uniform device- access interface to the I/O subsystem - (ANSWER)d. present a uniform
device- access interface to the I/O subsystem
An interrupt priority scheme can be used to ____.
Select one:
a. All the other answers
b.allow the most urgent work to be finished first
c.defer the handling of low-priority interrupt without masking off all interrupts
d.make it possible for high-priority interrupts to preempt the execution of a low priority interrupt -
(ANSWER)a. All the other answers
DMA controllers ____.
Select one:
a.are a nonstandard component in PCs of today
,CSC 415 OPERATING SYSTEMS ALL UNITS | 632 QUESTIONS AND ANSWERS | 2026 UPDATE
| WITH COMPLETE SOLUTION
b.can steal memory access cycles from the main CPU
c.do not utilize an additional, special purpose, processor
d.can access main memory at the same time as the main CPU - (ANSWER)b.can steal memory access
cycles from the main CPU
The ____ register of an I/O port can be written by the host to start a command or to change the mode of
a device.
Select one:
a. status
b. transfer
c. data-in
d. control - (ANSWER)d. control
____ I/O accesses a block device as a simple array of blocks.
Select one:
a. Raw
b. Cooked
c. Stream
d. Indirect - (ANSWER)a. Raw
A character-stream device ____.
Select one:
a. is a device such as a disk drive
b.transfers data in blocks of bytes
c.transfers data a byte at a time
,CSC 415 OPERATING SYSTEMS ALL UNITS | 632 QUESTIONS AND ANSWERS | 2026 UPDATE
| WITH COMPLETE SOLUTION
d. is similar to a random access device - (ANSWER)c.transfers data a byte at a time
Which of the following is true of a blocking system call?
Select one:
a.The application continues to execute its code when the call is issued.
b.Blocking application code is harder to understand than nonblocking application code
c.The call returns immediately without waiting for the I/O to complete.
d.The execution of the application is suspended when the call is issued. - (ANSWER)d.The execution of
the application is suspended when the call is issued.
Although caching and buffering are distinct functions, sometimes a region of memory can be used for
both purposes.
Select one:
True
False - (ANSWER)True
A sense key reports on the failure of a SCSI device by ____.
Select one:
a.giving detailed information about the exact cause of failure
b.stating the general category of failure
c.stating the general nature of the failure
d.maintaining internal pages of error-log information - (ANSWER)c.stating the general nature of the
failure
A(n) ____ is a buffer that holds output for a device that cannot accept interleaved data streams.
, CSC 415 OPERATING SYSTEMS ALL UNITS | 632 QUESTIONS AND ANSWERS | 2026 UPDATE
| WITH COMPLETE SOLUTION
Select one:
a. cache
b. spool
c. escape
d. block device - (ANSWER)b. spool
On a read operation, the device driver first checks if the data already available in the buffer cache.
Select one:
True
False - (ANSWER)False
In modern operating systems, dynamic loading and unloading allows
Select one:
a.adding new I/O devices without recompiling the kernel.
b.updating existing devices drivers without recompiling the kernel.
c.adding new I/O devices after the system has already been booted.
d. All the other choices - (ANSWER)d. All the other choices
In FAT used in MS-DOS,
Select one:
a. None of the other choices
b.a string preceding the colon that identifies the storage device.
c.the storage device is identified in the path name with no clear separation of the device portion.
| WITH COMPLETE SOLUTION
I/O subsystem is integrated into process manager, memory manager and file system.
Select one:
True
False - (ANSWER)False
Device drivers
Select one:
a. manage only the basic I/O hardware elements
b. manage only the newly emerging I/O devices that are unlike previous devices
c. All the other answers
d. present a uniform device- access interface to the I/O subsystem - (ANSWER)d. present a uniform
device- access interface to the I/O subsystem
An interrupt priority scheme can be used to ____.
Select one:
a. All the other answers
b.allow the most urgent work to be finished first
c.defer the handling of low-priority interrupt without masking off all interrupts
d.make it possible for high-priority interrupts to preempt the execution of a low priority interrupt -
(ANSWER)a. All the other answers
DMA controllers ____.
Select one:
a.are a nonstandard component in PCs of today
,CSC 415 OPERATING SYSTEMS ALL UNITS | 632 QUESTIONS AND ANSWERS | 2026 UPDATE
| WITH COMPLETE SOLUTION
b.can steal memory access cycles from the main CPU
c.do not utilize an additional, special purpose, processor
d.can access main memory at the same time as the main CPU - (ANSWER)b.can steal memory access
cycles from the main CPU
The ____ register of an I/O port can be written by the host to start a command or to change the mode of
a device.
Select one:
a. status
b. transfer
c. data-in
d. control - (ANSWER)d. control
____ I/O accesses a block device as a simple array of blocks.
Select one:
a. Raw
b. Cooked
c. Stream
d. Indirect - (ANSWER)a. Raw
A character-stream device ____.
Select one:
a. is a device such as a disk drive
b.transfers data in blocks of bytes
c.transfers data a byte at a time
,CSC 415 OPERATING SYSTEMS ALL UNITS | 632 QUESTIONS AND ANSWERS | 2026 UPDATE
| WITH COMPLETE SOLUTION
d. is similar to a random access device - (ANSWER)c.transfers data a byte at a time
Which of the following is true of a blocking system call?
Select one:
a.The application continues to execute its code when the call is issued.
b.Blocking application code is harder to understand than nonblocking application code
c.The call returns immediately without waiting for the I/O to complete.
d.The execution of the application is suspended when the call is issued. - (ANSWER)d.The execution of
the application is suspended when the call is issued.
Although caching and buffering are distinct functions, sometimes a region of memory can be used for
both purposes.
Select one:
True
False - (ANSWER)True
A sense key reports on the failure of a SCSI device by ____.
Select one:
a.giving detailed information about the exact cause of failure
b.stating the general category of failure
c.stating the general nature of the failure
d.maintaining internal pages of error-log information - (ANSWER)c.stating the general nature of the
failure
A(n) ____ is a buffer that holds output for a device that cannot accept interleaved data streams.
, CSC 415 OPERATING SYSTEMS ALL UNITS | 632 QUESTIONS AND ANSWERS | 2026 UPDATE
| WITH COMPLETE SOLUTION
Select one:
a. cache
b. spool
c. escape
d. block device - (ANSWER)b. spool
On a read operation, the device driver first checks if the data already available in the buffer cache.
Select one:
True
False - (ANSWER)False
In modern operating systems, dynamic loading and unloading allows
Select one:
a.adding new I/O devices without recompiling the kernel.
b.updating existing devices drivers without recompiling the kernel.
c.adding new I/O devices after the system has already been booted.
d. All the other choices - (ANSWER)d. All the other choices
In FAT used in MS-DOS,
Select one:
a. None of the other choices
b.a string preceding the colon that identifies the storage device.
c.the storage device is identified in the path name with no clear separation of the device portion.
