Answers....

1) Input Device any computer hardware devices that used in feeding commands or data inorder to process the computer depending on what the users input.The software or program of keyboard and mouse is usually built in from the operating system, however other input devices such as scanner (bio-matrix,bar code reader photo scanner etc.) web cammera has an own software/program this is together wth the hardware during purchasing usually in CD.

2)
 


*there is no differences in terms of key arrangement but the desktop keyboard is separated from the system unit while the mobile keyboard is built in.


3) Types of Mouse

  Mechanical mouse: Houses a hard rubber ball that rolls as the mouse is moved. Sensors inside the mouse body detect the movement and translate it into information that the computer interprets.

  Optical mouse: Uses an LED sensor to detect tabletop movement and then sends off that information to the computer for merry munching.

  Infrared (IR) or radio frequency cordless mouse: With both these types, the mouse relays a signal to a base station wired to the computer's mouse port. The cordless mouse requires power, which comes in the form of batteries.

  A mouse with many buttons: The extra buttons can be programmed to do specific things, such as navigate the Web or turn pages when you’re reading a document. The typical button-ified mouse has about five buttons.

  Trackball mouse: Like an upside-down mouse. Rather than roll the mouse around, you use your thumb or index finger to roll a ball on top of the mouse. The whole contraption stays stationary, so it doesn’t need a lot of room, and its cord never gets tangled.

  Stylus mouse: Another mouse mutation enjoyed by the artistic type is the stylus mouse, which looks like a pen and draws on a special pad.

  Cordless 3-D mouse: This kind of mouse can be pointed at the computer screen like a TV remote.

4)

Three Types of Touch Screen 

·                         Touch-screen technology falls into three categories: resistive, capacitive and surface wave. Each technology has strengths suited for specific applications.

1.      Resistive

·                       Resistive-type screens lack the clarity of other touch screens but they tend to be very durable and can be used in a variety of environments. Resistive-type screens are the most common in use today.

2.      Capacitive

·                       Capacitive screens are resistant to outside elements, making them very durable, and they still maintain a high clarity. Unlike resistive and surface wave screens, which can be used with stylus, capacitive panels must be touched with a finger.

3.      Surface Wave

·                       Surface wave touch panels are the more advanced of the three types, offering the highest clarity. But they are more easily damaged by outside elements.