QUIZ:


1. Define input and differentiate among a program, command and user response.

2. Identify the keys and buttons commonly found on desktop computer keyboards and describe how keyboards for mobile devices differ from desktop computer keyboards.

3. Describe different mouse types and explain how to use a mouse.

4. Describe various types touch screens and explain how a touch- sensitive pad works.

                                                   ANSWERS:

1.Input is the term denoting either an entrance or changes which are inserted into a system and which activate/modify a process. It is an abstract concept, used in the modeling, system(s) design and system(s) exploitation.

A computer program (also a software program, or just a program) is a sequence of instructions written to perform a specified task for a computer.

Command is a directive to a computer program acting as an interpreter of some kind, in order to perform a specific task.
User Response-the act of responding; reply or reaction.

2.

A keyboard typically has characters engraved or printed on the keys and each press of a key typically corresponds to a single written symbol. However, to produce some symbols requires pressing and holding several keys simultaneously or in sequence. While most keyboard keys produce letters, numbers or signs (characters), other keys or simultaneous key presses can produce actions or computer commands. In normal usage, the keyboard is used to type text and numbers into a word processor, text editor or other program. In a modern computer, the interpretation of key presses is generally left to the software. A computer keyboard distinguishes each physical key from every other and reports all key presses to the controlling software. Keyboards are also used for computer gaming, either with regular keyboards or by using keyboards with special gaming features, which can expedite frequently used keystroke combinations. A keyboard is also used to give commands to the operating system of a computer, such as Windows' Control-Alt-Delete combination, which brings up a task window or shuts down the machine. It is the only way to enter commands on a command-line interface. 3.

•  Mechanical Mouse- requires a ball to move the cursor on the screen.
• Optomechanical or optical-mechanical mouse - is a combination of the optical and the mechanical technologies. It uses a ball but detects the mouse movement optically. It is now the most commonly used with PC.
• optical mouse- uses a laser; precisely an optical sensor to help detecting the mouse’s moving.
• wireless mouse- relies infrared, radio signals or Bluetooth to communicate with the computer.
• cordless mouse- uses the wireless communication technology (via infrared, radio or Bluetooth) to transmit data to the computer.ow to Use a mouse:
  Resistive touchscreens are the most widely used touch screens in mobile phones. They are cheap and resistant to water and dust, but they get easily scratched and cannot be used with sharp objects. You can use any object to touch it, for instance finger, stylus, etc. You need to apply a bit of pressure in order to press the touchscreen. They have a good lifespan of about 35 million clicks.

 how to Use a Mouse:

1. Connect the mouse. If you drag it around the arrow on the screen should move around with it. If not, you may have a technical problem. Sometimes the arrow will dart around in spurts, or will move too slowly. The former will require troubleshooting (probably downloading a driver) and the latter can be adjusted in your computer's settings. If this doesn't work, consider using a wrench to open your mouse and remove any broken objects.
2. Mice (more than one mouse) can be used by either hand. If you are left handed, you can just place the mouse on the other side of the keyboard, if it reaches. The mouse will work the same.
3. Hold the mouse correctly. For Windows or PC users, place your pointer finger on the left button, and your ring finger on the right button. If your mouse has a button or 'wheel' in the middle, your middle finger can operate this. For Mac users, the mouse usually has only one button. Use any of your three center fingers to press the button.
4. To click, press the button (usually the left one, when there are two) and promptly release it. It should be a firm, quick tap, and the mouse should be still when you do it.
5. To double click (for opening applications, documents or folders), you must click (the left button) twice in rapid succession. If you have physical trouble with the required speed, your computer can be adjusted to suit your needs.
6. To drag files, press and hold the (left) button, then move the mouse without letting the button go until the file is where you want it to be.
7. Use mouse gestures. When you feel more confident you may like to set up mouse gestures.

4. Different Types of touch screens:

• Resistive touchscreens are the most widely used touch screens in mobile phones. They are cheap and resistant to water and dust, but they get easily scratched and cannot be used with sharp objects.
• Capacitive touchscreens are basically of two types- one that can recognize multiple touches simultaneously and the other which cannot. These type of touchscreens are costlier than the resistive types. They are scratch, moisture and dust-proof.
• Infrared touchscreens are the most expensive of the all the three mentioned here. It doesn’t require physical force, just a gentle touch is enough. In addition to this it is not influenced by dust, moisture or scratches. Moreover it’s the most durable compared to the other ones. They are basically of two types: optical and heat-sensitive.

Touchpad- a pointing device consisting of a soft pad sensitized to finger movement or pressure and used especially on laptop computers as an alternative to a mouse.