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Question 73 of 75 · Organization, CPU, I/O Devices
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NIMCET 2024

Which of the following interfaces performs the transfer of data between the memory and the I/O peripheral without involving the CPU?

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Answer: Option A — DMA

Detailed Solution

In Direct Memory Access (DMA), a DMA controller moves blocks of data directly between memory and the I/O device; the CPU only starts the transfer and is free meanwhile.

A serial interface sends bits one at a time through the CPU's control, DDA is a line-drawing algorithm in graphics, and 'branch interface' is not a data-transfer interface.

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Organization, CPU, I/O Devices — Preparation

This question tests your understanding of Organization, CPU, I/O Devices, a key topic in the Computer Awareness section. The detailed solution above uses a step-by-step approach to show the reasoning, and where available, a shortcut that helps you solve similar questions in under 90 seconds during the actual exam.

This topic covers how a computer is organised internally and how it communicates with the outside world. The central processing unit (CPU) has three main parts: the arithmetic logic unit (ALU), which performs calculations and comparisons; the control unit (CU), which directs operations; and registers, which hold data temporarily. The topic also covers the system bus (data, address and control buses), the motherboard, and clock speed. Input and output (I/O) devices are the other main part. Input devices include the keyboard, mouse, scanner, microphone, OCR, OMR, MICR and barcode readers. Output devices include monitors, printers (impact and non-impact), plotters and speakers. Exam questions often ask you to classify a device as input, output or both (such as a touchscreen), or to identify which device is used for a particular purpose, such as MICR for bank cheques. Practise the CPU and I/O device questions below. Each answer includes an explanation.

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