Test: Accessing I/O Devices


10 Questions MCQ Test Computer Architecture & Organisation (CAO) | Test: Accessing I/O Devices


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QUESTION: 1

In memory-mapped I/O ____________

Solution:

Answer: a
Explanation: Its the different modes of accessing the i/o devices.

QUESTION: 2

The usual BUS structure used to connect the I/O devices is

Solution:

Answer: c
Explanation: BUS is a collection of address,control and data lines used to connect the various devices of the computer.

QUESTION: 3

In intel’s IA-32 architecture there is a seperate 16 bit address space for the I/O devices? 

Solution:

Answer: b
Explanation: This type of accessing is called as I/O mapped devices.

QUESTION: 4

 The advantage of I/O mapped devices to memory mapped is

Solution:

Answer: c
Explanation: Since the I/O mapped devices have a seperate address space the address lines are limited by amount of the space allocated.

QUESTION: 5

The system is notified of a read or write operation by

Solution:

Answer: d
Explanation: It is necessary for the processor to send a signal intimating the request as either read or write.

QUESTION: 6

To overcome the lag in the operating speeds of the I/O device and the processor we use

Solution:

Answer: b
Explanattion: The processor operating is much faster than that of the I/O devices , so by using the status flags the processor need not wait till the I/O operation is done. It can continue with its work until the status flag is set.

QUESTION: 7

The method of accessing the I/O devices by repeatedly checking the status flags is

Solution:

Answer: a
Explanation: In this method the processor constantly checks the status flags , and when it finds that the flag is set it performs the appropriate operation.

QUESTION: 8

The method of synchronising the processor with the I/O device in which the device sends a signal when it is ready is

Solution:

Answer: c
Explanation: This is a method of accessing the I/O devices which gives the complete power to the devices, enabling them to intimate the processor when they’re ready for transfer.

QUESTION: 9

The method which offers higher speeds of I/O transfers is

Solution:

Answer: d
Explanation: In DMA the I/O devices are directly allowed to interact with the memory with out the intervention of the processor and the transfres take place in the form of blocks increasing the speed of operaion.

QUESTION: 10

The process where in the processor constantly checks the status flags is called as

Solution:

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