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MCQ

Q.

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

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MCQ

1.

The _________ present a uniform device-access interface to the I/O subsystem, much as system calls provide a standard interface between the application and the operating system.

A

Devices

B

Buses

C

Device drivers

D

I/O systems

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2.

The ______ register is written by the host to send output.

A

status

B

control

C

data in

D

data out

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3.

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

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4.

I/O hardware contains ____________

A

Bus

B

Controller

C

I/O port and its registers

D

All of the mentioned

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5.

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

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