Output Devices Flash Cards

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| By Thames

Thames

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| Questions: 12

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1. How is sound processed on a computer before reaching the speakers?

The sound card has no role in processing sound for the speakers.

The sound is directly sent to the speakers from the CPU.

When a sound is played on a computer, the CPU sends thedigital data to the Digital Sound Processor on the computer's sound card. Anon-board digital to analogue converter (DAC) then produces the analogue outputthat goes to the speakers.

A separate external sound processor is used to convert digital data to analogue for the speakers.

The correct answer explains the process of sending digital data to the sound card's Digital Sound Processor which then converts it to analogue output for the speakers.

Explanation

The correct answer explains the process of sending digital data to the sound card's Digital Sound Processor which then converts it to analogue output for the speakers.

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About This Quiz

Output Devices

2. How do speakers operate?

Speakers operate by converting sound waves directly into electric signals.

Speakers operate by emitting light waves that are converted to sound by the human ear.

Speakers operate by amplifying the natural vibrations of the air around them to create sound.

The electric signal from the computer powers anelectromagnet at the rear of the speaker. This electromagnet attracts and repels the cones in the speaker accordingto the electric signal from the computer. The cone generates different soundsby vibrating at different speeds, creating sound waves. This is the reverse process to a microphonewhere the sound waves vibrate the cone, which in turn generates an electricsignal (in fact speakers can be used as microphones).

Speakers operate by converting the electric signal from the computer into mechanical vibrations of the cone to generate sound waves.

Explanation

Speakers operate by converting the electric signal from the computer into mechanical vibrations of the cone to generate sound waves.

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3. What do impact printers use to create text and images?

They use heat to transfer ink onto the paper.

They use magnets to align tiny particles for printing.

They use lasers to create text on the page.

These use fine pins striking a ribbon to make dots, whichbuild up text and images. Letter qualityprinters use multiple strikes to build up text with overlapping dots. Howeverthey are very noisy and not very fast compared to modern printers. The paper is generally pulled through by means of holeseither side of the page, which can be torn off afterwards. They used to be the most popular printersbefore inkjet and laser printers, but are now generally used when multiple carboncopies are needed.

Impact printers use pins striking a ribbon to create text and images, unlike lasers, heat, or magnets.

Explanation

Impact printers use pins striking a ribbon to create text and images, unlike lasers, heat, or magnets.

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4. Why do printers need printer drivers?

Printers automatically download the necessary drivers upon connection to a computer.

Like any device, printers need drivers to interface with theoperating system. Every printer has its own driver, which must be installedbefore it can be used. This is because every printer operates slightlydifferently and uses different control commands. When a document is printedfrom an application like a word processor, the information is sent to theprinter driver, which converts the information to the correct format for thespecific printer being used.

Printers do not need printer drivers to function.

Printer drivers are only needed for wireless printers.

Printer drivers are essential for printers to communicate with the operating system and ensure that the correct format is used for printing.

Explanation

Printer drivers are essential for printers to communicate with the operating system and ensure that the correct format is used for printing.

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5. What is the definition of Plotters?

Plotters can producevery high-resolution drawings and are often used for very large diagrams, andmay be used for other large graphics such as posters and maps. With the advent of colour laser printers,plotters are not being used so much, but they still have an advantage in thatsome plotters are accurate to hundredths of a millimetre. Also some plottersare used on huge pieces of paper.

Plotters are only able to produce black and white images.

Plotters are unable to print on large pieces of paper.

Plotters are used primarily for printing text documents.

Plotters are specialized printers that excel at creating detailed, high-resolution graphics, such as diagrams, posters, and maps. They are particularly known for their accuracy and ability to work with large paper sizes.

Explanation

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6. How do plotters operate?

Plotters operate by scanning the document to be printed and converting it into digital format before printing.

The computer sends the information to be printed to the printer, which then sends it to the plotter for printing.

The computer sends the information to be printed to theplotter. Plotters are essentially pensattached to motors. A plotter will usually have more than one (coloured) pen,and some have as many as eight pens. Theplotter will then work in one of two ways:1. The pens may only be able to move across thepaper in which case the paper is fed through a fraction at a time and the penseither lifted up or held down.2. The paper may be still and the pens movearound the paper in all directions controlled by the motors. These are called flatbed plotters.

Plotters print by using inkjet technology similar to modern printers.

Plotters operate by receiving information from the computer and using pens attached to motors to print on paper. They do not use inkjet technology or scan documents to convert them into digital format.

Explanation

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7. What type of languages are used for plotter devices?

Only manual commands are needed to operate a plotter device

Raster languages are used for plotter devices

Plotter devices use programming languages like Java and Python

Because plotters are vector devices, drawing images bymoving a pen in certain directions and not drawing each pixel individually,they must be commanded differently. Hewlett-Packard's HPGL is the most commonlyused language to direct a plotter. Also, a file format called Computer GraphicsMetafile (CGM) was developed for holding computer image information, such asthose printed by plotters.
These standards have mostly been superseded now,with the development of large, high-quality inkjet printers.

Plotters are vector devices that require specific languages to command them for drawing images. HPGL and CGM are commonly used for this purpose, contrary to the other options provided.

Explanation

Plotters are vector devices that require specific languages to command them for drawing images. HPGL and CGM are commonly used for this purpose, contrary to the other options provided.

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8. How does a VDU (Video Display Unit) work in relation to video cards?

The computer sends the image data directly to the monitor for display.

The digital information about what is to be displayed issent from the computer to the video card, where the DAC (Digital to AnalogueConverter) on the video card looks up the three voltage levels needed for thethree primary colours used to create the colour of a single pixel.

The video card directly displays the information without any conversion process.

The video card uses a digital to digital converter to interpret the image data.

The correct answer explains the process of how the video card receives digital information and converts it into analogue signals for display on the monitor.

Explanation

The correct answer explains the process of how the video card receives digital information and converts it into analogue signals for display on the monitor.

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9. What is the main advantage of a TFT active matrix screen over a LCD screen?

A more advanced type of screen than LCD is theTFT active matrix screen which gives higher resolution and more contrast andhas a wider viewing angle. Each pixel onthe screen is controlled by its own transistor. TFT screens are mainly used for laptop/notepad computers

TFT screens have lower resolution than LCD screens.

TFT screens have narrower viewing angles than LCD screens.

TFT screens are primarily used for desktop computers.

TFT screens offer higher resolution, better contrast, and wider viewing angles compared to LCD screens, making them suitable for use in laptop/notepad computers.

Explanation

TFT screens offer higher resolution, better contrast, and wider viewing angles compared to LCD screens, making them suitable for use in laptop/notepad computers.

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10. What is the definition of gas plasma displays?

Gas plasma displays are a type of holographic technology used for creating 3D images.

Gas plasma displays utilize liquid crystals to produce visual output.

Gas plasma displays involve using compressed air to display images on the screen.

Gas plasma displays may be one of the displaymethods of the future as it can be used for displays as thin as LCD screens(less than 5cm thick), is viewable from a wide area (unlike LCDs), can be usedfor very large screens and can be produced relatively cheaply. Very briefly, a current is applied to a cellwhich contains neon and xenon gases which then throw off different strengthultraviolet light waves (depending on the current) which cause phosphors toglow, as in a SVGA monitor

Gas plasma displays are unique display methods that offer advantages such as thinness, wide viewability, cost-effectiveness, and suitability for large screens by utilizing neon and xenon gases to create ultraviolet light waves that cause phosphors to glow.

Explanation

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11. What are some key components of Virtual Reality systems?

Virtual Reality systems only rely on standard monitors and do not utilize any specialized display devices.

Virtual Reality environments are still largely indevelopment. They require expensive hardware and software to create a realisticlooking environment. Currently, the main output devices of VR systems arespeakers/headphones and 3D displays, usually in the form of a headset.

Virtual Reality systems are widely available and do not require any specific hardware or software.

Virtual Reality environments are fully developed and do not need any updates or improvements.

Virtual Reality environments are still evolving and require specialized hardware and software for a realistic experience. The main output devices of VR systems are speakers/headphones and 3D displays, typically in the form of a headset.

Explanation

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12. How does the LCD Shutter Glasses method work?

The LCD Shutter Glasses method uses polarized lenses to create a 3D effect.

The LCD Shutter Glasses method involves projecting images directly onto the user's retinas.

The LCD Shutter Glasses method relies on smell receptors to create the illusion of depth.

In the LCD shutter method, the viewer watches astandard screen, which is showing a rapidly alternating image. The LCD glasseshave to be linked to the screen and synchronised. By alternating left and rightimages on the screen and alternating the LCD shutters the view from one eye isalternately occluded so that only the right eye sees the right image and onlythe left eye sees the left image. In this way, the brain can judge depth and a3D image created

The correct answer explains the process of how LCD Shutter Glasses work to create a 3D image by alternating images seen by each eye. The incorrect answers provide alternative methods or unrelated concepts that do not align with the actual functioning of LCD Shutter Glasses.

Explanation

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