IGCSE Information & Communication Technology Paper-1: Specimen Questions with Answers 40 - 40 of 45

Question number: 40

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Appeared in Year: 2009

MCQ▾

Question

Choose three items which are output devices?

Choices

Choice (4)Response

a.

CRT

b.

Buzzer

c.

Dot matrix printer

d.

All b. , a. and c. are correct

Answer

d.

Explanation

Dot matrix printer: It is a printer that creates each character from an array of dots that are usually formed by transferring ink by mechanical impact. It may be a serial printer, printing a character at a time, or a line printer. These are used in applications where noise is not an issue and copies have to make ex: Industrial environments etc.

The Dot Matrix printer

The Dot Matrix Printer

Buzzer: A buzzer is an audio signalling device, which may be mechanical, electromechanical, or piezoelectric (piezo for short). Typical uses of buzzers and beepers include alarm devices, timers, and confirmation of user input such as a mouse click or keystroke. Ex: Automatic cookers, microwave ovens etc.

Image of the Buzzer

Image of the Buzzer

CRT: CRT stands for cathode ray tube. It is the technology used in traditional computer monitors and televisions. The image on a CRT display is created by firing electrons from the back of the tube to phosphors located towards the front of the display. Once the electrons hit the phosphors, they light up and are projected on the screen. The color shown on the screen is produced by a blend of red, blue, and green light, often referred to as RGB.

Image of the CRT

Image of the CRT

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