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Q.

The data-in register of I/O port is ____________

A

Read by host to get input

B

Read by controller to get input

C

Written by host to send output

D

Written by host to start a command

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MCQ

1.

In general the two interrupt request lines are ____________

A

maskable and non maskable interrupts

B

blocked and non maskable interrupts

C

maskable and blocked interrupts

D

none of the mentioned

Discussion

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2.

DMA is used for __________

A

High speed devices

B

Low speed devices

C

Utilizing CPU cycles

D

All of the mentioned

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3.

A process is moved to wait queue when I/O request is made with ____________

A

non-blocking I/O

B

blocking I/O

C

asynchronous I/O

D

synchronous I/O

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4.

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

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5.

Which buffer holds the output for a device?

A

spool

B

output

C

status

D

magic

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