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GR11 CAT Theory Nov > Input and Output > Flashcards

Input and Output Flashcards

1
Q

Define and provide examples of input devices

A

Devices that receive user inputs and send the data to a computer, e.g.:
- keyboard
- mouse
- microphone
- scanner

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2
Q

What is the purpose of sticky keys in accessibility features?

A

Helps users with motor function difficulties by allowing one keypress at a time for keyboard shortcuts.

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3
Q

Name one health issue caused by excessive use of input devices.

A

Repetitive strain injury (RSI).

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4
Q

What is response time,
and what is response time in monitors?

A

a measure of the time it takes a computer to react to a request to do something

The time taken for a pixel to change from one color to another.

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5
Q

Advantage of HDMI over VGA connectors?
(HDMI = High-Definition Multimedia Interface)
(VGA = Video Graphics Array)

A

HDMI supports both high-quality audio and video, while VGA only supports video.

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6
Q

Provide examples of output devices

A
  • Monitor
  • Printer
  • Speaker.
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7
Q

What are some ways to prevent health issues?

A
  • Use ergonomic keyboards
  • Use adjustable chairs.
  • Take regular breaks to prevent strain.
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8
Q

What is resolution and how is it measured?

A
  • the number of individual dots of colour contained on a display (pixels)
  • Measured in pixels (e.g., 1920 x 1080).
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9
Q

How is printer speed measured?

A

Pages per minute (ppm).

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10
Q

What are some specs to consider when buying digital cameras?

A
  • Lenses
  • Sensor size
  • Optical zoom
  • Digital Zoom
  • Resolution
  • ISO rating
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11
Q

What is DPI and how does it affect image quality?

A

Dots Per Inch
The greater the DPI, the greater the image quality
Higher DPI = Larger image file

(resolution)

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12
Q

What is Colour depth and how does it effect image quality?

A

Number of different colours that can be represented by a pixel

24 bit colour - high enough for practical purposes

High colour depth = larger image file

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13
Q

List some advantages of scanners

A

Advantages:
- Larger documents can be scanned into single digital file
- OCR software (optical character recognition) converts images into editable documents
- Barcodes, QR codes, number plates

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14
Q

List some disadvantages of scanners

A

Disadvantages:
- Quality of digital image depends largely on quality of the original copy
- Can take a lot of time

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15
Q

What is biometric input?
List advantages and disadvantages

A

Capturing unique biological features of a person

Advantages:
- Security
- Only authorised person gets access

Disadvantages:
- Expensive
- Needs Additional Hardware and software

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16
Q

What is RFID?

A

Radio Frequency Identification

  • RFID tags store data on the tag or card – detected wirelessly
17
Q

Provide examples of Data collection devices

A
  • Monitor patient’s temperature, heart rate, blood pressure
  • Weather buoys in oceans collect data on weather conditions
18
Q

List the 4 types of output

A

Visual Output
- soft copy (on a screen)
- hard copy (printed onto paper)

Sound Output
- speakers or headphones

Touch Output
- joysticks/controllers/mobile devices VIBRATE
- 3d printers create physical copies of objects

Other output
- not designed for humans
- eg electrical signals to control equipment

19
Q

What do display devices do?

List advantages and disadvantages

A
  • Display options that allow the user to make choices/interact with the program/OS
  • Displays the results of processing

Advantages:
- immediate feedback
- interaction between user and computer
- text can be enlarged for visually impaired users

Disdvantages:
- output is not permanent
- can lead to eyestrain
- expensive to replace
- work not private (visible to passers by)

20
Q

What is aspect ratio?
What is contrast ratio?

A
  • The width of the display screen in relation to the height (16:9)
  • The luminance of the brightest color in relation to the darkest color
21
Q

Advantages of Laser Printers

A
  • more reliable
  • easier to maintain
  • better for B&W printing
  • cheaper to run§
22
Q

Advantages of Inkjet printers

A
  • better for photo quality prints
23
Q

List advantages and disadvantages of Interactive whiteboards

A

Advantages
- Better interaction + participation
- Notes made on whiteboard can be saved and accessed
- Presenting content in multimedia format facilitates different learning styles

Disadvantages
- Needs dimly lit venue
- Small boards are difficult to read
- Suitable software not always available
- Not afforadable for many schools
- Teachers hesitant to use newer technology

24
Q

Plug and Play

A

OS automatically detects+configures a device

GR11 CAT Theory Nov (6 decks)

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