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Questions and Answers
What is the main difference between a sheet-fed scanner and a handheld scanner?
What is the main difference between a sheet-fed scanner and a handheld scanner?
- A sheet-fed scanner is used in the publishing industry, while a handheld scanner is for personal use.
- A sheet-fed scanner uses a motorized belt, while a handheld scanner relies on the user to move it. (correct)
- A sheet-fed scanner is portable, while a handheld scanner is stationary.
- A sheet-fed scanner captures detailed images, while a handheld scanner does not provide good image quality.
How does a drum scanner work differently from a sheet-fed scanner?
How does a drum scanner work differently from a sheet-fed scanner?
- A drum scanner captures images mounted on a glass cylinder, while a sheet-fed scanner scans images on paper.
- A drum scanner uses a photo multiplier tube, while a sheet-fed scanner uses a sensor. (correct)
- A drum scanner uses color filters, while a sheet-fed scanner uses basic light technology.
- A drum scanner captures incredibly detailed images, while a sheet-fed scanner provides quick text capture.
What is the primary function of a microphone in a computer?
What is the primary function of a microphone in a computer?
- To record audio or video tutorials (correct)
- To control the movement of people and objects in games
- To scan documents
- To capture detailed images
Why are joysticks preferred for arcade-type computer games?
Why are joysticks preferred for arcade-type computer games?
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What distinguishes a digital camera from a computer scanner?
What distinguishes a digital camera from a computer scanner?
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Study Notes
Printers
- Dot Matrix Printers:
- Used for printing duplicate copies quickly and cheaply
- Limited to situations where carbon copies are needed and quality is not important
- Low printing quality
- Low purchase cost and running costs
- Can print fairly quickly
- Robust and can operate in harsh environments
- Can produce multiple copies using self-carbonating paper
- Ink Jet Printers:
- Popular choice for home and school use
- Ink cartridges can be expensive, leading to high running costs
- Relatively inexpensive
- Produce high-quality black and white or color printing
- Slow speed compared to laser printers
- Laser Printers:
- Commonly used for fast, high-quality printing
- Non-color laser printers are more expensive than ink-jet printers
- Color laser printers are more expensive but offer high-quality output
- Quiet and fast, producing high-quality printouts
- Low running costs due to long-lasting toner cartridges
Plotters
- Devices that draw pictures on paper based on computer commands
- Different from printers, as they draw lines using a pen
- Can produce continuous lines, unlike printers which simulate lines with dots
- Multicolour plotters use different colored pens to draw different colors
- Often used in science and engineering applications for drawing building plans, printer circuit boards, and machine parts
- Fast and accurate, but relatively expensive compared to printers
- Can produce large printouts, up to the size of a small room
Headphones
- Provide sound output from the computer
- Similar to speakers, but worn on the ears, allowing only one person to hear the output
- Headsets are a combination of speakers and microphone
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