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| Questão | Responda |
| When are touch screens used and why? | In public places because they don't require any other input devices and are easy and simple to use, limiting selection of items from the menu. |
| Give some advantages of speech recognition software | 1. Reduces likelihood of RSI 2. No keyboard & mouse saves space |
| Give some disadvantages of speech recognition software | 1. Not reliable because different words sound different depending on accent and voice 2. Words that sound the same but are spelt differently slow down the process e.g there and their. |
| OMR (Optical Mark Recognition) | senses the position of marks on data capture forms such as multiple choice exam papers or lottery entry sheets |
| OCR (Optical Character Recognition) | uses a scanner and specialist software to turn paper-based text into computer characters |
| Name as many input devices as you can | Keyboard, mouse, scanner, touch screen, webcam, joystick, digital camera |
| Name the 4 different types of scanner and how they work | Flat bed scanner - document is placed on flat glass plate Handheld scanner - cannot be lifted, used in shops Sheetfed scanner - scanner head is still and paper moved over it Drum scanner - gives very high definition images |
| What does EPOS do? | uses bar codes to enter product numbers at shop tills that are linked to stock databases |
| Give an advantage of a webcam to a business | Can see each other whilst in different places Saves everyone travelling to a meeting location, saving CO2 emissions |
| In what ways could you adapt an input device for someone with a disability? (8 marks) | 1. Pointer speed of mouse can be adjusted for easier positioning 2. Speed of mouse clicks can be adjusted 3. The buttons on the mouse can be set for left or right handed use 4. The numeric keypad can be set to move the pointer 5. A trackball could be used for a user with limited mobility 6. Single keystrokes can replace combined ones like Ctrl Alt Del 7. Concept keyboards could be used to simplify the interface by restricting input options 8. A foot mouse could be used instead of a traditional one |
| What factors would you think about when choosing an input device? (5 marks) | 1. Type of data 2.Volume of data 3. User preferences 4. Cost considerations 5. Where the device is going to be used |
| In what ways could text be input to a document? (4 marks) | 1. Manually with a keyboard & mouse 2. With a scanner using OCR 3. Read into a microphone with voice recognition software 4. Written on a graphics tablet with handwriting recognition software |
| What are the 4 main data types? | 1. Text 2.Still/moving images 3. Numbers 4. Sound |
| Name the 2 types of mouse and how they work | 1. Optical mouse, uses a light sensor to detect motion, no mouse mat needed. 2. Mechanical mouse, has a rolling ball and the computer senses its position on a flat surface, need a mouse mat. |
| Name 3 alternatives to a mouse and how they work | 1. Trackpad, often used with laptops the user moves their finger over a sensitive plate to control the cursor 2. Trackball, has a ball on the surface rolled with hands or palm, often used in confined spaces 3. Trackpoint, small button works like a joystick and sometimes seen on mobiles, PDA's and laptops |
| When are concept keyboards used and why? | 1. Restaurants because they have a plastic film over them to protect from drink spills, can press buttons without having to remember price 2. With people with disabilities or children because they're simple to use e.g. child responds to what colour something is by pressing a section of the keyboard |
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