Input Output (IO) System

Multiple Choice questions & answers are available for a Computer Science students to clear GAT, NTS, ECAT exams, various technical interview, competitive examination, and other entrance exam. Input Output (IO) System is the important Topic for a computer science and technical students and one should practice these Mcqs to grasp good knowledge on the topic.

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31.
The __________ is used by device controllers to request service.

Nonmaskable interrupt

Blocked interrupt

Maskable interrupt

None of the mentioned

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32.
The interrupt vector contains :

The interrupts

The memory addresses of specialized interrupt handlers

The identifiers of interrupts

The device addresses

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33.
Division by zero, accessing a protected or non existent memory address, or attempting to execute a privileged instruction from user mode are all categorized as ________

Errors

Exceptions

Interrupt handlers

All of the mentioned

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34.
For large data transfers, _________ is used.

Dma

Programmed I/O

Controller register

None of the mentioned

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35.
A character stream device transfers :

Bytes one by one

Block of bytes as a unit

With unpredictable response times

None of the mentioned

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36.
A block device transfers :

Bytes one by one

Block of bytes as a unit

With unpredictable response times

None of the mentioned

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37.
A dedicated device is :

Opposite to a sharable device

Same as a sharable device

Can be used concurrently by several processes

None of the mentioned

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38.
A keyboard is an example of a device that is accessed through a __________ interface.

Block stream

Set of blocks

Character stream

None of the mentioned

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39.
In polling :

Busy – wait cycles wait for I/O from device

Interrupt handler receives interrupts

Interrupt-request line is triggered by I/O device

All of the mentioned

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40.
A non blocking system call _________________

Halts the execution of the application for an extended time

Does not halt the execution of the application

Does not block the interrupts

None of the mentioned

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41.
An asynchronous call :

Returns immediately, without waiting for the I/O to complete

Does not return immediately and waits for the I/O to complete

Consumes a lot of time

Is too slow

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42.
Buffering is done to :

Cope with device speed mismatch

Cope with device transfer size mismatch

Maintain copy semantics

All of the mentioned

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43.
Caching is ________ spooling.

Same as

Not the same as

All of the mentioned

None of the mentioned

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44.
Caching :

Holds a copy of the data

Is fast memory

Holds the only copy of the data

Holds output for a device

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45.
Spooling :

Holds a copy of the data

Is fast memory

Holds the only copy of the data

Holds output for a device

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