Vocabulary practice section 1

1. Read the following definition about the keyboard find out the mistakes and correct them.

a) Alphanumeric keys: arranged in the same order as a type-writher

b) Function keys: cursor and other keys usually used within word processors to page up and down in a long document or to edit text (Insert or Delete keys)

c) Numeric keypad: used to issue commands or to produce alternative characters in key combinations for example, the Alt key.

d) Editing keys: used by various programs to instruct the PC to perform specific tasks, such as Save, Copy, Cut, Paste, etc.

2. Match these descriptions with the names of keys. Then find them on the keyboard.

arrow keys return caps lock shift tab escape space bar backspace alt

A long key at the bottom of the keyboard. Each time it is pressed, it produces a blank space. It moves the cursor to the beginning of a new line. It is also used to confirm commands. It stops a program without losing the information from the main memory. Sometimes its use depends on the applications.

4. It works in combination with other keys to produce special characters or specific actions.

5. It removes the character to the left of the cursor or any selected text.

6. It produces UPPER-CASE characters (or the upper-case character of the key).

7. It produces upper-case letters, but it does not affect numbers and symbols.

8. It moves the cursor horizontally to the right for a fixed number of spaces (in tabulations and data fields).

9. They are used to move the cursor, as an alternative to the mouse.

3. Identify the keys described below.

The keyboard consists of:

1.Keys on a computer or terminal keyboard which can be programmed so as to cause an operating system command interpreter or application program to perform certain actions.

2. Special keys on a computer keyboard that modify the normal action of another key when the two are pressed in combination.

3. The keyboard keys that move the pointer, or cursor, on screen. They include the up, down, left and right arrow, home, end, pageUp and pageDown keys.

4. Keys that allow an operator to enter numbers, a minus sign, and a decimal point into the control.

5. It is used to confirm commands; in a word processor, it creates a new paragraph.

6. It is used to remove the highlighted parts of text or the symbol after the cursor.

7. It is used to move the cursor one space forward.

8. It is used to cancel the current task.

9. It is used to copy the screenshot to clipboard.

4. Complete these FAQs from a word processing program with the right key names.

1. Question: How do I start a new line in my document? Answer: Just hit ……. 2. Question: How can I delete a letter or word that I’ve typed? Answer: Position the cursor after the letter or word and hit ……. once per letter.

3. Question: Do I have to use the mouse to navigate around my document?

Answer: No, you can also use the ……. keys.

4. Question: How can I type in UPPER CASE characters?

Answer: If you want to type one or two letters in upper case, then simply hold down ….. and type the letters at the same time. If you want to type a whole sentence in upper case, you should use … .

KEY INFORMATION SECTION 2

A mouse is a pointing hand-held device for use with a graphical user interface that lets you move a pointer (or cursor) and select items on the screenthus simplifying user's orientation on the display.It was nicknamed the mouse because the tail came out the end. It has a detection device (usually a ball) on the bottom that is rolled on a mousemat. When you move the mouse across a flat surface, the ball turns two rollers tracking the mouse's vertical and horizontal movements. As the device moves across the surface, the cursor moves across the screen. The rotating ball glides easily, giv­ing the user good control over the textual and graphical images.A mouse has one or more buttons to communicate with the PC. To select items or choose commands on the screen, the user presses a button on the mouse.A scroll wheel lets you move through your documents or web pages. The pointer looks like an I-bar, an arrow or a pointing hand.

The mechanical mouseis a simple, hard rubber ball mouse which has sensors that detect the movements of the mouse and translate them in moving the pointer on the screen.

The optomechanical mouse works on the same principle. The rollers have wheels on the end of them with evenly spaced holes. As the wheels spin, a light-sensitive optical device counts the

number of holes that pass by and converts them to an "X" and "Y" axis.
	An optical mouse has an optical laser sensor instead of a rubber ball and rollers underneath.The lasers detect the movement of the mouse and move the pointer accordingly. The mouse is connected to the computer in many forms and ports. They
are serial mouse, bus mouse, PS/2 mouse, cordless mouse and USB mouse. A cordless (wireless) mouse has no cable; it sends data via infrared signals or radio waves. Mouse actions: - to click, press and release the left button.

- to double-click, press and release the left button twice.

- to drag, hold down the button, move the pointer to a new place and then release the button.

- to right-click, press and release the right button; this action displays a list of commands.

In portable computers touch panelsortouchpadsare used instead of manipulators. Moving a finger along the surface of the touch pad is transformed into the cursor movement across the screen. A light penis a photosensitive penlike instrument with a light sensitive tip
	that is used to draw directly on a computer video screen or to select information on the screen by pressing a clip in the light pen or by pressing the light pen against the surface of the screen. The pen contains light sensors that identify which portion of the screen it is passed over. It can be used for drawing directly on the monitor screen

or for reading printed optical characters or barcodes.

A joystickis a pointing device composed of a vertical lever that moves in multiple directions to navigate a cursor or other graphical object on a computer screen precisely and at high speed. It is particularly good for playing fast action games.

Graphical plotting tables(graphics tablets) find application in draw­ing and inputting manuscript texts. You can draw, add notes and signs to electronic documents by means of a special pen. Microphone is a device used to input sound.

You can also interact with your computer by voice with a voice-recognition system that converts voice into text, so you can dictate text directly onto your word processor

or email program. It converts spoken words into information that the computer can recognize and process.You can also control your PC with voice commands; this means you can launch programs, open, save or print files. Some systems let you search the Web or chat using your voice instead of the keyboard.