Input, Output, Storage

Question 1

Keyboard

Answer 1

• Input device
• Advantages : Standard keyboards are inexpensive.
• Disadvantages : typing skills, prolonged use can cause hand and wrist injuries known as CTS

Question 2

Mouse

Answer 2

• Pointing device
• Optical Mouse:
   uses light technology
   More expensive.

Wireless Cordless Mouse:
 Battery operated.
 Uses wireless technology such as Infrared light waves to transmit data.

Question 3

LCD monitors

Answer 3

• Device that displays text, graphics and videos.
• Use liquid crystal technology.
• Pixels are the smallest unit of a digital image.

Question 4

Resolution

Answer 4

800 pixels per horizontal inch X 600 pixels per vertical inch.

Question 5

Dot pitch

Answer 5

The distance between the pixels on the screen. The smaller the distance, the
clearer the picture.

Question 6

Refresh Rate

Answer 6

• Measured in Hertz (Hz).
  -Refers to the speed with which the monitor
  redraws an image on the screen.
  -Slow refresh rates causes the image to fade or flicker.

Question 7

Impact printer

Answer 7

• Produces a copy using mechanical parts that hit against and inked ribbon, which strikes the paper.

Question 8

Non-impact printer

Answer 8

• Does not physically hit the paper.

- E.g the inkjet printer and the laser printer.

Question 9

Things to consider when buying a printer

Answer 9

 Quality – the resolution is measured in dots per inch
 Speed – Measured in pages per minute (ppm).
 Memory
 Cost – Laser printers are slightly more expensive than inkjet printers.

Question 10

Memory sizes

Answer 10

bit, byte, kilobyte, megabyte, gigabyte, terabyte,

petabyte, Exabyte