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Question 26 of 75 · Organization, CPU, I/O Devices
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TCS Exam

Which of these input devices is widely used in tests such as aptitude tests?

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Answer: Option B — Optical mark recognition

Detailed Solution

Optical Mark Recognition (OMR) reads filled bubbles on answer sheets, which is why it is used for aptitude and competitive tests.

MICR reads cheque characters, and bar-code readers read product codes.

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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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