Input Output Systems Questions

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41.

The kernel data structures include ____________

A

process table

B

open file table

C

close file table

D

all of the mentioned

Correct Answer: B

None.

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42.

Windows NT uses a __________ implementation for I/O.

A

message

B

draft

C

secondary memory

D

cache

Correct Answer: A

None.

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43.

A ________ is a full duplex connection between a device driver and a user level process.

A

Bus

B

I/O operation

C

Stream

D

Flow

Correct Answer: C

None.

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44.

I/O is a _________ in system performance.

A

major factor

B

minor factor

C

does not matter

D

none of the mentioned

Correct Answer: A

None.

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45.

If the number of cycles spent busy - waiting is not excessive, then ____________

A

interrupt driven I/O is more efficient than programmed I/O

B

programmed I/O is more efficient than interrupt driven I/O

C

both programmed and interrupt driven I/O are equally efficient

D

none of the mentioned

Correct Answer: B

None.

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46.

I/O hardware contains ____________

A

Bus

B

Controller

C

I/O port and its registers

D

All of the mentioned

Correct Answer: D

None.

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47.

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

Correct Answer: A

None.

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48.

The host sets _____ bit when a command is available for the controller to execute.

A

write

B

status

C

command-ready

D

control

Correct Answer: C

None.

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49.

When hardware is accessed by reading and writing to the specific memory locations, then it is called ____________

A

port-mapped I/O

B

controller-mapped I/O

C

bus-mapped I/O

D

none of the mentioned

Correct Answer: D

It is called memory-mapped I/O.

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50.

Device drivers are implemented to interface ____________

A

character devices

B

block devices

C

network devices

D

all of the mentioned

Correct Answer: D

None.

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