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Input Output Systems MCQs

		        
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1. 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 called interrupt trigger program

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Answer is : B

							  None.
							  
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2. 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 the mentioned

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Answer is : B

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3. What is an ISR?
Information Service Request
Interrupt Service Request
Interrupt Service Routine
Information Service Routine

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Answer is : C

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Given Answer:  C
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4. What is an interrupt vector?
It is an address that is indexed to an interrupt handler
It is a unique device number that is indexed by an address
It is a unique identity given to an interrupt
None of the mentioned

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Answer is : A

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5. DMA is used for __________
High speed devices
Low speed devices
Utilizing CPU cycles
All of the mentioned

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Answer is : A

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6. In a memory mapped input/output __________
the CPU uses polling to watch the control bit constantly, looping to see if a 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

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Answer is : B

							  None.
							  
Report QuestionQuestion:  In a memory mapped input/output __________
Given Answer:  B
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7. In a programmed input/output(PIO) __________
the CPU uses polling to watch the control bit constantly, looping to see if a 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

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Answer is : A

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Report QuestionQuestion:  In a programmed input/output(PIO) __________
Given Answer:  A
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8. In an interrupt driven input/output __________
the CPU uses polling to watch the control bit constantly, looping to see if a 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

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Answer is : C

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Report QuestionQuestion:  In an interrupt driven input/output __________
Given Answer:  C
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9. How does the Hardware trigger an interrupt?
Sending signals to CPU through a system bus
Executing a special program called interrupt program
Executing a special program called system program
Executing a special operation called system call

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Answer is : A

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10. 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 the mentioned

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Answer is : D

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Given Answer:  D
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