Operating System Mcqs

Page No. 8

In a programmed input/output(PIO) __________


athe CPU uses polling to watch the control bit constantly, looping to see if a device is ready

✓


bthe CPU writes one data byte to the data register and sets a bit in control register to show that a byte is available

✖


cthe CPU receives an interrupt when the device is ready for the next byte

✖


dthe CPU runs a user written code and does accordingly

✖



In a memory mapped input/output __________


athe CPU uses polling to watch the control bit constantly, looping to see if a device is ready

✖


bthe CPU writes one data byte to the data register and sets a bit in control register to show that a byte is available

✓


cthe CPU receives an interrupt when the device is ready for the next byte

✖


dthe CPU runs a user written code and does accordingly

✖



DMA is used for __________


aHigh speed devices(disks and communications network)

✓


bLow speed devices

✖


cUtilizing CPU cycles

✖


dAll of the mentioned

✖



What is an interrupt vector?


aIt is an address that is indexed to an interrupt handler

✓


bIt is a unique device number that is indexed by an address

✖


cIt is a unique identity given to an interrupt

✖


dNone of the mentioned

✖



What is an ISR?


aInformation Service Request

✖


bInterrupt Service Request

✖


cInterrupt Service Routine

✓


dInformation Service Routine

✖



What is a trap/exception?


ahardware generated interrupt caused by an error

✖


bsoftware generated interrupt caused by an error

✓


cuser generated interrupt caused by an error

✖


dnone of the mentioned

✖



How does the software trigger an interrupt?


aSending signals to CPU through bus

✖


bExecuting a special operation called system call

✓


cExecuting a special program called system program

✖


dExecuting a special program called interrupt trigger program

✖



The initial program that is run when the computer is powered up is called __________


aboot program

✖


bbootloader

✖


cinitializer

✖


dbootstrap program

✓


View Answer bootstrap program

Which one of the following can not be scheduled by the kernel?


akernel level thread

✖


buser level thread

✓


cprocess

✖


dnone of the mentioned

✖


View Answer user level thread

In multilevel feedback scheduling algorithm ____________


aa process can move to a different classified ready queue

✓


bclassification of ready queue is permanent

✖


cprocesses are not classified into groups

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dnone of the mentioned

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