Input Output Systems Questions

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1.

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 called interrupt trigger program

Correct Answer: B

None.

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2.

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 the mentioned

Correct Answer: B

None.Answer: a

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3.

What is an ISR?

A

Information Service Request

B

Interrupt Service Request

C

Interrupt Service Routine

D

Information Service Routine

Correct Answer: C

None.

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4.

What is an interrupt vector?

A

It is an address that is indexed to an interrupt handler

B

It is a unique device number that is indexed by an address

C

It is a unique identity given to an interrupt

D

None of the mentioned

Correct Answer: A

None.

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5.

DMA is used for __________

A

High speed devices

B

Low speed devices

C

Utilizing CPU cycles

D

All of the mentioned

Correct Answer: A

None.

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6.

In a memory mapped input/output __________

A

the CPU uses polling to watch the control bit constantly, looping to see if a 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

Correct Answer: B

None.

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7.

In a programmed input/output(PIO) __________

A

the CPU uses polling to watch the control bit constantly, looping to see if a 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

Correct Answer: A

None.

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8.

In an interrupt driven input/output __________

A

the CPU uses polling to watch the control bit constantly, looping to see if a 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

Correct Answer: C

None.

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9.

How does the Hardware trigger an interrupt?

A

Sending signals to CPU through a system bus

B

Executing a special program called interrupt program

C

Executing a special program called system program

D

Executing a special operation called system call

Correct Answer: A

None.

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10.

Which operation is performed by an interrupt handler?

A

Saving the current state of the system

B

Loading the interrupt handling code and executing it

C

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

D

All of the mentioned

Correct Answer: D

None.

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