Operating System Mcqs

Page No. 35

A block device transfers ____________


abytes one by one

✖


bblock of bytes as a unit

✓


cwith unpredictable response times

✖


dnone of the mentioned

✖



A character stream device transfers ____________


abytes one by one

✓


bblock of bytes as a unit

✖


cwith unpredictable response times

✖


dnone of the mentioned

✖


View Answer bytes one by one

For large data transfers, _________ is used.


adma

✓


bprogrammed I/O

✖


ccontroller register

✖


dnone of the mentioned

✖


View Answer dma

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 ________


aerrors

✖


bexceptions

✓


cinterrupt handlers

✖


dall of the mentioned

✖


View Answer exceptions

The interrupt vector contains ____________


athe interrupts

✖


bthe memory addresses of specialized interrupt handlers

✓


cthe identifiers of interrupts

✖


dthe device addresses

✖



The __________ is used by device controllers to request service.


anonmaskable interrupt

✖


bblocked interrupt

✖


cmaskable interrupt

✓


dnone of the mentioned

✖


View Answer maskable interrupt

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


anon-maskable interrupt

✖


bblocked interrupt

✖


cmaskable interrupt

✓


dnone of the mentioned

✖


View Answer maskable interrupt

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


ainterrupt driven I/O is more efficient than programmed I/O

✖


bprogrammed I/O is more efficient than interrupt driven I/O

✓


cboth programmed and interrupt driven I/O are equally efficient

✖


dnone of the mentioned

✖



I/O is a _________ in system performance.


amajor factor

✓


bminor factor

✖


cdoes not matter

✖


dnone of the mentioned

✖


View Answer major factor

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


aBus

✖


bI/O operation

✖


cStream

✓


dFlow

✖


View Answer Stream

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