Operating System Mcqs

Page No. 34

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


acontroller

✓


bdriver

✖


chost

✖


dbus

✖


View Answer controller

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.


aDevices

✖


bBuses

✖


cDevice drivers

✓


dI/O systems

✖


View Answer Device drivers

When device A has a cable that plugs into device B, and device B has a cable that plugs into device C and device C plugs into a port on the computer, this arrangement is called a _________


aport

✖


bdaisy chain

✓


cbus

✖


dcable

✖


View Answer daisy chain

A ____ a set of wires and a rigidly defined protocol that specifies a set of messages that can be sent on the wires.


aport

✖


bnode

✖


cbus

✓


dnone of the mentioned

✖


View Answer bus

If one or more devices use a common set of wires to communicate with the computer system, the connection is called ______


aCPU

✖


bMonitor

✖


cWirefull

✖


dBus

✓


View Answer Bus

An asynchronous call ____________


areturns immediately, without waiting for the I/O to complete

✓


bdoes not return immediately and waits for the I/O to complete

✖


cconsumes a lot of time

✖


dis too slow

✖



A non blocking system call _________________


ahalts the execution of the application for an extended time

✖


bdoes not halt the execution of the application

✓


cdoes not block the interrupts

✖


dnone of the mentioned

✖



In polling ____________


abusy – wait cycles wait for I/O from device

✓


binterrupt handler receives interrupts

✖


cinterrupt-request line is triggered by I/O device

✖


dall of the mentioned

✖



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


ablock stream

✖


bset of blocks

✖


ccharacter stream

✓


dnone of the mentioned

✖


View Answer character stream

What is a dedicated device?


aopposite to a sharable device

✓


bsame as a sharable device

✖


ccan be used concurrently by several processes

✖


dnone of the mentioned

✖



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