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


dnone of the mentioned



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