Lesson 2 (computer harware and storage devices)

Question 1

is the most common and very popular input device which helps to input data to the computer. The layout of the blank is like that of traditional typewriter, although there are some additional keys provided for performing additional functions.

Answer 1

Keyboard

Question 2

blank is the most popular pointing device. It is a very famous cursor-control device having a small palm size box with a round ball at its base, which senses the movement of the blank and sends corresponding signals to the CPU when the mouse buttons are pressed.

Answer 2

Mouse

Question 3

is an input device, which works more like a photocopy machine. It is used when some information is available on paper and it is to be transferred to the hard disk of the computer for further manipulation.

Answer 3

Scanner

Question 4

is an input device which converts analog information into digital form. Digitizer can convert a signal from the television or camera into a series of numbers that could be stored in a computer. They can be used by the computer to create a picture of whatever the camera had been pointed at.

Answer 4

Digitizer

Question 5

is a device used for reading bar coded data (data in the form of light and dark lines). Bar coded data is generally used in labelling goods, numbering the books, etc. It may be a handheld scanner or may be embedded in a stationary scanner.

Answer 5

Barcode reader

Question 6

commonly called as Visual Display Unit (VDU), are the main output device of a computer. It forms images from tiny dots, called pixels that are arranged in a rectangular form. The sharpness of the image depends upon the number of pixels

Answer 6

Monitor

Question 7

The blank is made up of small picture elements called pixels. The smaller the pixels, the better the image clarity or resolution. It takes more than one illuminated pixel to form a whole character, such as the letter ‘e’ in the word help.

Answer 7

Cathode-Ray Tube (CRT) Monitor

Question 8

The blank refers to a class of video devices that have reduced volume, weight and power requirement in comparison to the CRT.

Answer 8

Flat-Panel Display Monitor

Question 9

is an output device, which is used to print information on paper.

Answer 9

Printer

Question 10

In the market, one of the most popular printers is blank. These printers are popular because of their ease of printing and economical price. Each character printed is in the form of pattern of dots and head consists of a Matrix of Pins of size (57, 79, 97 or 99) which come out to form a character which is why it is called blank

Answer 10

DOT MATRIX PRINTER

Question 11

These are non-impact page printers. They use laser lights to produce the dots needed to form the characters to be printed on a page.

Answer 11

LASER PRINTER

Question 12

blank are non-impact character printers based on a relatively new technology. They print characters by spraying small drops of ink onto paper. Inkjet printers produce high quality output with presentable features.

Answer 12

INKJET PRINTERS