aiou Course: Basics of ICT (1431) autunm 2014 solve assiment 1

Q.1       Define the term computer. Also describe different types as well as applications of the computer?
ans

Q.2    a)      Discuss the purpose of Point & Draw devices.                                        (10)

            b)         What is the difference between memory and hard disk? Explain it in
detail
ans(a)Point & Draw Devices: 

A pointing & draw device is a hardware input device that allows the user to move the mouse pointer. Good examples of pointing devices are a computer mouse, trackball, light pens, touchpad, and even the keyboard. A pointing device is an external tool that is used to move objects around and also to select options from menus. 

Types Of Point & Draw Devices: 

These are the major point and draw devices of computer. 

Pen- The pen lets you draw on what is called a digitizing tablet that mirrors the surface area of the computer screen. The pen can be used as a standard mouse (without wires connected to it) or also as a free flowing drawing device. The pen is useful for drawing since drawing graphics with a mouse tends to be somewhat difficult. 

Mouse - The mouse is a hand held device that lets you point to and selected items on your screen. In a PC mouse there are mostly 2-3 buttons and on a Mac there is one. A ball under the mouse senses movement. To ensure smooth motion your should remove the ball and clean it regularly. 

Keyboard: One of the main input or point and draw device used on a computer, a PC's keyboard looks very similar to the keyboards of electric typewriters, with some additional keys. Below is a graphic of the Saitek Gamers' keyboard with indicators pointing to each of the major portions of the keyboard. 

Cordless Mouse - The cordless mouse is a lot better than a normal mouse thus by reducing the clutter of the work space needed to move the mouse around. This mouse runs on a battery. When you move the mouse it sends an infrared beam to a sensor which interprets it causing it to move. 

Trackball - The trackball is an upside-down mouse that remains stationary on your desk. It is the same principle as the mouse except that the rollers are reversed and the ball is on top. This ball does not need as much attention as the normal mouse because the only thing that touches it is your hand as the normal mouse touches a surface. 

Touchpad - The touchpad has sensors that sense your touch. When they sense your touch they send a signal to the computer to move the mouse pointer to that location on the screen. 

Joystick- The joystick allows the user to move quickly in computer games. Light pen- The light pen system allows the user to touch the computer screen with a lighted pen to activate commands and make selections.

Light pen- The light pen system allows the user to touch the computer screen with a lighted pen to activate commands and make selections. 

Touch Screen- The touch screen lets the user touch the area to be activated by using the finger or hand.