Input Output (IO) System

Multiple Choice questions & answers are available for a Computer Science students to clear GAT, NTS, ECAT exams, various technical interview, competitive examination, and other entrance exam. Input Output (IO) System is the important Topic for a computer science and technical students and one should practice these Mcqs to grasp good knowledge on the topic.

1.
The initial program that is run when the computer is powered up is called :

Boot program

Bootloader

Initializer

Bootstrap program

2.
How does the software trigger an interrupt ?

Sending signals to CPU through bus

Executing a special operation called system call

Executing a special program called system program

Executing a special program calle interrupt trigger program

3.
What is a trap/exception ?

Hardware generated interrupt caused by an error

Software generated interrupt caused by an error

User generated interrupt caused by an error

None of these

4.
What is an ISR ?

Information Service Request

Interrupt Service Request

Interrupt Service Routine

Information Service Routine

5.
An interrupt vector

Is an address that is indexed to an interrupt handler

Is a unique device number that is indexed by an address

Is a unique identity given to an interrupt

None of these

6.
DMA is used for :

High speed devices(disks and communications network)

Low speed devices

Saving CPU cycles

Both a and c

7.
In a memory mapped input/output :

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

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

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

The CPU runs a user written code and does accordingly

8.
In a programmed input/output(PIO) :

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

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

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

The CPU runs a user written code and does accordingly

9.
In an interrupt driven input/output :

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

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

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

The CPU runs a user written code and does accordingly

10.
In the layered approach of Operating Systems :

Bottom Layer(0) is the User interface

Highest Layer(N) is the User interface

Bottom Layer(0) is the hardware

Both b and c

11.
How does the Hardware trigger an interrupt ?

Sending signals to CPU through system bus

Executing a special program called interrupt program

Executing a special program called system program

Executing a special operation called system call

12.
Which operation is performed by an interrupt handler ?

Saving the current state of the system

Loading the interrupt handling code and executing it

Once done handling, bringing back the system to the original state it was before the interrupt occurred

All of these

13.
Why is the Software interrupt required by the processor?

Return from subroutine.

Obtain system services, which need execution of privileged instruction.

Test the interrupt system of the processor.

Implement co-routines.

14.
Match the following list1 with list2:a. DMA I/O ————————————– 1. High speed RAMb. Cache —————————————- 2. Diskc. Interrupt I/O ——————————— 3. Printerd. Condition code register ——————- 4. ALU

A – 2, b – 1, c – 3, d - 4

A – 4, b – 1, c – 3, d - 2

A – 2, b – 3, c – 1, d - 4

A – 3, b – 4, c – 2, d - 1

15.
Which of the following is an example of Spooled Device?

A graphic display device

A line printer used to print the output of a number of jobs

A terminal used to enter input data to a running program

A secondary storage device in a virtual memory system

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