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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 1 of 6

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Q1.
The initial program that is run when the computer is powered up is called :

a.

boot program

b.

bootloader

c.

initializer

d.

bootstrap program

Discuss
Answer: (d).bootstrap program
Q2.
How does the software trigger an interrupt ?

a.

Sending signals to CPU through bus

b.

Executing a special operation called system call

c.

Executing a special program called system program

d.

Executing a special program calle interrupt trigger program

Discuss
Answer: (b).Executing a special operation called system call
Q3.
What is a trap/exception ?

a.

hardware generated interrupt caused by an error

b.

software generated interrupt caused by an error

c.

user generated interrupt caused by an error

d.

None of these

Discuss
Answer: (b).software generated interrupt caused by an error
Q4.
What is an ISR ?

a.

Information Service Request

b.

Interrupt Service Request

c.

Interrupt Service Routine

d.

Information Service Routine

Discuss
Answer: (c).Interrupt Service Routine
Q5.
An interrupt vector

a.

is an address that is indexed to an interrupt handler

b.

is a unique device number that is indexed by an address

c.

is a unique identity given to an interrupt

d.

None of these

Discuss
Answer: (a).is an address that is indexed to an interrupt handler
Q6.
DMA is used for :

a.

High speed devices(disks and communications network)

b.

Low speed devices

c.

Saving CPU cycles

d.

Both a and c

Discuss
Answer: (d).Both a and c
Q7.
In a memory mapped input/output :

a.

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

b.

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

c.

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

d.

the CPU runs a user written code and does accordingly

Discuss
Answer: (b).the CPU writes one data byte to the data register and sets a bit in control register to show that a byte is available
Q8.
In a programmed input/output(PIO) :

a.

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

b.

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

c.

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

d.

the CPU runs a user written code and does accordingly

Discuss
Answer: (a).the CPU uses polling to watch the control bit constantly, looping to see if device is ready
Q9.
In an interrupt driven input/output :

a.

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

b.

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

c.

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

d.

the CPU runs a user written code and does accordingly

Discuss
Answer: (c).the CPU receives an interrupt when the device is ready for the next byte
Q10.
In the layered approach of Operating Systems :

a.

Bottom Layer(0) is the User interface

b.

Highest Layer(N) is the User interface

c.

Bottom Layer(0) is the hardware

d.

Both b and c

Discuss
Answer: (d).Both b and c
Page 1 of 6

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