1690 + Mcqs in Operating System Page 27 McqOptions

1301.	Priority inversion is solved by use of _____________
A.	priority inheritance protocol
B.	two phase lock protocol
C.	time protocol
D.	all of the mentioned
Answer» B. two phase lock protocol

Discussion

1302.	The most effective technique to keep dispatch latency low is to :
A.	provide non preemptive kernels
B.	provide preemptive kernels
C.	make it user programmed
D.	run less number of processes at a time
Answer» C. make it user programmed

Discussion

1303.	The amount of time required for the scheduling dispatcher to stop one process and start another is known as ______________
A.	event latency
B.	interrupt latency
C.	dispatch latency
D.	context switch
Answer» D. context switch

Discussion

1304.	Real time systems need to __________ the interrupt latency.
A.	minimize
B.	maximize
C.	not bother about
D.	none of the mentioned
Answer» B. maximize

Discussion

1305.	Interrupt latency refers to the period of time :
A.	from the occurrence of an event to the arrival of an interrupt
B.	from the occurrence of an event to the servicing of an interrupt
C.	from arrival of an interrupt to the start of the interrupt service routine
D.	none of the mentioned
Answer» D. none of the mentioned

Discussion

1306.	Event latency is :
A.	the amount of time an event takes to occur from when the system started
B.	the amount of time from the event occurrence till the system stops
C.	the amount of time from event occurrence till the event crashes
D.	the amount of time that elapses from when an event occurs to when it is serviced.
Answer» E.

Discussion

1307.	Real time systems must have :
A.	preemptive kernels
B.	non preemptive kernels
C.	preemptive kernels or non preemptive kernels
D.	neither preemptive nor non preemptive kernels
Answer» B. non preemptive kernels

Discussion

1308.	Preemptive, priority based scheduling guarantees :
A.	hard real time functionality
B.	soft real time functionality
C.	protection of memory
D.	none of the mentioned
Answer» C. protection of memory

Discussion

1309.	The disadvantage of real addressing mode is :
A.	there is a lot of cost involved
B.	time consumption overhead
C.	absence of memory protection between processes
D.	restricted access to memory locations by processes
Answer» D. restricted access to memory locations by processes

Discussion

1310.	VxWorks is centered around
A.	wind microkernel
B.	linux kernel
C.	unix kernel
D.	None of the mentioned
Answer» B. linux kernel

Discussion

1311.	Which one of the following is a real time operating system?
A.	RTLinux
B.	VxWorks
C.	Windows CE
D.	All of the mentioned
Answer» E.

Discussion

1312.	Time required to synchronous switch from the context of one thread to the context of another thread is called
A.	threads fly-back time
B.	jitter
C.	context switch time
D.	none of the mentioned
Answer» D. none of the mentioned

Discussion

1313.	Time duration required for scheduling dispatcher to stop one process and start another is known as
A.	process latency
B.	dispatch latency
C.	execution latency
D.	interrupt latency
Answer» C. execution latency

Discussion

1314.	The problem of priority inversion can be solved by
A.	priority inheritance protocol
B.	priority inversion protocol
C.	both priority inheritance and inversion protocol
D.	none of the mentioned
Answer» B. priority inversion protocol

Discussion

1315.	In which scheduling certain amount of CPU time is allocated to each process?
A.	earliest deadline first scheduling
B.	proportional share scheduling
C.	equal share scheduling
D.	none of the mentioned
Answer» C. equal share scheduling

Discussion

1316.	In rate monotonic scheduling
A.	shorter duration job has higher priority
B.	longer duration job has higher priority
C.	priority does not depend on the duration of the job
D.	none of the mentioned
Answer» B. longer duration job has higher priority

Discussion

1317.	Hard real time operating system has ___ jitter than a soft real time operating system.
A.	less
B.	more
C.	equal
D.	none of the mentioned
Answer» B. more

Discussion

1318.	In real time operating system
A.	all processes have the same priority
B.	a task must be serviced by its deadline period
C.	process scheduling can be done only once
D.	kernel is not required
Answer» C. process scheduling can be done only once

Discussion

1319.	If the number of cycles spent busy – waiting is not excessive, then :
A.	interrupt driven I/O is more efficient than programmed I/O
B.	programmed I/O is more efficient than interrupt driven I/O
C.	both programmed and interrupt driven I/O are equally efficient
D.	none of the mentioned
Answer» C. both programmed and interrupt driven I/O are equally efficient

Discussion

1320.	I/O is a _________ in system performance.
A.	major factor
B.	minor factor
C.	does not matter
D.	none of the mentioned
Answer» B. minor factor

Discussion

1321.	A ________ is a full duplex connection between a device driver and a user level process.
A.	Bus
B.	I/O operation
C.	Stream
D.	Flow
Answer» D. Flow

Discussion

1322.	Windows NT uses a __________ implementation for I/O
A.	message – passing
B.	draft – passing
C.	secondary memory
D.	cache
Answer» B. draft – passing

Discussion

1323.	The kernel data structures include :
A.	process table
B.	open file table
C.	close file table
D.	all of the mentioned
Answer» C. close file table

Discussion

1324.	The ________ keeps state information about the use of I/O components.
A.	CPU
B.	OS
C.	kernel
D.	shell
Answer» D. shell

Discussion

1325.	Spooling :
A.	holds a copy of the data
B.	is fast memory
C.	holds the only copy of the data
D.	holds output for a device
Answer» D. holds output for a device

Discussion

1326.	Caching :
A.	holds a copy of the data
B.	is fast memory
C.	holds the only copy of the data
D.	holds output for a device
Answer» B. is fast memory

Discussion

1327.	Caching is ________ spooling.
A.	same as
B.	not the same as
C.	All of the mentioned.
D.	none of the mentioned
Answer» C. All of the mentioned.

Discussion

1328.	Buffering is done to :
A.	cope with device speed mismatch
B.	cope with device transfer size mismatch
C.	maintain copy semantics
D.	all of the mentioned
Answer» E.

Discussion

1329.	An asynchronous call :
A.	returns immediately, without waiting for the I/O to complete
B.	does not return immediately and waits for the I/O to complete
C.	consumes a lot of time
D.	is too slow
Answer» B. does not return immediately and waits for the I/O to complete

Discussion

1330.	A non blocking system call _________________
A.	halts the execution of the application for an extended time
B.	does not halt the execution of the application
C.	does not block the interrupts
D.	none of the mentioned
Answer» C. does not block the interrupts

Discussion

1331.	In polling :
A.	busy – wait cycles wait for I/O from device
B.	interrupt handler receives interrupts
C.	interrupt-request line is triggered by I/O device
D.	all of the mentioned
Answer» B. interrupt handler receives interrupts

Discussion

1332.	A keyboard is an example of a device that is accessed through a __________ interface.
A.	block stream
B.	set of blocks
C.	character stream
D.	none of the mentioned
Answer» D. none of the mentioned

Discussion

1333.	A dedicated device is :
A.	opposite to a sharable device
B.	same as a sharable device
C.	can be used concurrently by several processes
D.	none of the mentioned
Answer» B. same as a sharable device

Discussion

1334.	A block device transfers :
A.	bytes one by one
B.	block of bytes as a unit
C.	with unpredictable response times
D.	none of the mentioned
Answer» C. with unpredictable response times

Discussion

1335.	A character stream device transfers :
A.	bytes one by one
B.	block of bytes as a unit
C.	with unpredictable response times
D.	none of the mentioned
Answer» B. block of bytes as a unit

Discussion

1336.	For large data transfers, _________ is used.
A.	dma
B.	programmed I/O
C.	controller register
D.	none of the mentioned
Answer» B. programmed I/O

Discussion

1337.	Division by zero, accessing a protected or non existent memory address, or attempting to execute a privileged instruction from user mode are all categorized as ________
A.	errors
B.	exceptions
C.	interrupt handlers
D.	all of the mentioned
Answer» C. interrupt handlers

Discussion

1338.	The interrupt vector contains :
A.	the interrupts
B.	the memory addresses of specialized interrupt handlers
C.	the identifiers of interrupts
D.	the device addresses
Answer» C. the identifiers of interrupts

Discussion

1339.	The __________ is used by device controllers to request service.
A.	nonmaskable interrupt
B.	blocked interrupt
C.	maskable interrupt
D.	none of the mentioned
Answer» D. none of the mentioned

Discussion

1340.	The ________ can be turned off by the CPU before the execution of critical instruction sequences that must not be interrupted.
A.	nonmaskable interrupt
B.	blocked interrupt
C.	maskable interrupt
D.	none of the mentioned
Answer» D. none of the mentioned

Discussion

1341.	The _________ are reserved for events such as unrecoverable memory errors.
A.	non maskable interrupts
B.	blocked interrupts
C.	maskable interrupts
D.	none of the mentioned
Answer» B. blocked interrupts

Discussion

1342.	In general the two interrupt request lines are :
A.	maskable & non maskable interrupts
B.	blocked & non maskable interrupts
C.	maskable & blocked interrupts
D.	none of the mentioned
Answer» B. blocked & non maskable interrupts

Discussion

1343.	The _________ determines the cause of the interrupt, performs the necessary processing and executes a return from the interrupt instruction to return the CPU to the execution state prior to the interrupt.
A.	interrupt request line
B.	device driver
C.	interrupt handler
D.	all of the mentioned
Answer» D. all of the mentioned

Discussion

1344.	The CPU hardware has a wire called __________ that the CPU senses after executing every instruction.
A.	interrupt request line
B.	interrupt bus
C.	interrupt receive line
D.	interrupt sense line
Answer» B. interrupt bus

Discussion

1345.	The hardware mechanism that allows a device to notify the CPU is called _______
A.	polling
B.	interrupt
C.	driver
D.	controlling
Answer» C. driver

Discussion

1346.	The ______ register is written by the host to send output.
A.	status
B.	control
C.	data in
D.	data out
Answer» E.

Discussion

1347.	The ______ register is read by the host to get input.
A.	flow in
B.	flow out
C.	data in
D.	data out
Answer» D. data out

Discussion

1348.	An I/O port typically consists of four registers status, control, ________ and ________ registers.
A.	system in, system out
B.	data in, data out
C.	flow in, flow out
D.	input, output
Answer» C. flow in, flow out

Discussion

1349.	A ________ is a collection of electronics that can operate a port, a bus, or a device.
A.	controller
B.	driver
C.	host
D.	bus
Answer» B. driver

Discussion

1350.	The _________ present a uniform device-access interface to the I/O subsystem, much as system calls provide a standard interface between the application and the operating system.
A.	Devices
B.	Buses
C.	Device drivers
D.	I/O systems
Answer» D. I/O systems

Discussion

Explore topic-wise MCQs in Technical Programming.

Priority inversion is solved by use of _____________

The most effective technique to keep dispatch latency low is to :

The amount of time required for the scheduling dispatcher to stop one process and start another is known as ______________

Real time systems need to __________ the interrupt latency.

Interrupt latency refers to the period of time :

Event latency is :

Real time systems must have :

Preemptive, priority based scheduling guarantees :

The disadvantage of real addressing mode is :

VxWorks is centered around

Which one of the following is a real time operating system?

Time required to synchronous switch from the context of one thread to the context of another thread is called

Time duration required for scheduling dispatcher to stop one process and start another is known as

The problem of priority inversion can be solved by

In which scheduling certain amount of CPU time is allocated to each process?

In rate monotonic scheduling

Hard real time operating system has ___ jitter than a soft real time operating system.

In real time operating system

If the number of cycles spent busy – waiting is not excessive, then :

I/O is a _________ in system performance.

A ________ is a full duplex connection between a device driver and a user level process.

Windows NT uses a __________ implementation for I/O

The kernel data structures include :

The ________ keeps state information about the use of I/O components.

Spooling :

Caching :

Caching is ________ spooling.

Buffering is done to :

An asynchronous call :

A non blocking system call _________________

In polling :

A keyboard is an example of a device that is accessed through a __________ interface.

A dedicated device is :

A block device transfers :

A character stream device transfers :

For large data transfers, _________ is used.

Division by zero, accessing a protected or non existent memory address, or attempting to execute a privileged instruction from user mode are all categorized as ________

The interrupt vector contains :

The __________ is used by device controllers to request service.

The ________ can be turned off by the CPU before the execution of critical instruction sequences that must not be interrupted.

The _________ are reserved for events such as unrecoverable memory errors.

In general the two interrupt request lines are :

The _________ determines the cause of the interrupt, performs the necessary processing and executes a return from the interrupt instruction to return the CPU to the execution state prior to the interrupt.

The CPU hardware has a wire called __________ that the CPU senses after executing every instruction.

The hardware mechanism that allows a device to notify the CPU is called _______

The ______ register is written by the host to send output.

The ______ register is read by the host to get input.

An I/O port typically consists of four registers status, control, ________ and ________ registers.

A ________ is a collection of electronics that can operate a port, a bus, or a device.

The _________ present a uniform device-access interface to the I/O subsystem, much as system calls provide a standard interface between the application and the operating system.

An I/O port typically consists of four registers status, control, and registers.