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Welcome to the IO Systems MCQs Page

Dive deep into the fascinating world of IO Systems with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of IO Systems, a crucial aspect of Operating System. In this section, you will encounter a diverse range of MCQs that cover various aspects of IO Systems, from the basic principles to advanced topics. Each question is thoughtfully crafted to challenge your knowledge and deepen your understanding of this critical subcategory within Operating System.

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Check out the MCQs below to embark on an enriching journey through IO Systems. Test your knowledge, expand your horizons, and solidify your grasp on this vital area of Operating System.

Note: Each MCQ comes with multiple answer choices. Select the most appropriate option and test your understanding of IO Systems. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

IO Systems MCQs | Page 3 of 6

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Q21.
A ________ is a collection of electronics that can operate a port, a bus, or a device.

a.

controller

b.

driver

c.

host

d.

bus

Discuss
Answer: (a).controller
Q22.
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

Discuss
Answer: (b).data in, data out
Q23.
The ______ register is read by the host to get input.

a.

flow in

b.

flow out

c.

data in

d.

data out

Discuss
Answer: (c).data in
Q24.
The ______ register is written by the host to send output.

a.

status

b.

control

c.

data in

d.

data out

Discuss
Answer: (d).data out
Q25.
The hardware mechanism that allows a device to notify the CPU is called _______

a.

polling

b.

interrupt

c.

driver

d.

controlling

Discuss
Answer: (b).interrupt
Q26.
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

Discuss
Answer: (a).interrupt request line
Q27.
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

Discuss
Answer: (c).interrupt handler
Q28.
In general the two interrupt request lines are :

a.

maskable & nonmaskable interrupts

b.

blocked & nonmaskable interrupts

c.

maskable & blocked interrupts

d.

none of the mentioned

Discuss
Answer: (a).maskable & nonmaskable interrupts
Q29.
The _________ are reserved for events such as unrecoverable memory errors.

a.

nonmaskable interrupts

b.

blocked interrupts

c.

maskable interrupts

d.

none of the mentioned

Discuss
Answer: (a).nonmaskable interrupts
Q30.
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

Discuss
Answer: (b).nonmaskable interrupts
Page 3 of 6

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