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digital tech > Digital Data > Flashcards

Digital Data Flashcards

1
Q

What is Data?

A

Unprocessed facts or figures that, on their own, have no meaning

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2
Q

What is information?

A

When data is entered into a computer system and is processed, it becomes information, or ‘data with meaning’

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3
Q

In what format does the computer store data?

A

Binary Format

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4
Q

1 nibble = ?

A

4 bits

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5
Q

1 byte = ?

A

8 bits

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6
Q

1 kilobyte= ?

A

1024 bytes

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7
Q

1 megabyte= ?

A

1024 kilobytes

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8
Q

1024 megabytes=?

A

1 Gigabyte

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9
Q

1024 Gigabytes=?

A

1 Terabyte

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10
Q

What is the Data type numeric

A

An integer number that can be positive or negative

An integer number that has no decimal or fractional parts

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11
Q

Explain the Data type Date/Time

A

Long date: displayed as Sunday, April 1, 2018.

Medium date: displayed as dd-mmm-yyyy, e.g. 1-Apr-2018.

Short date: displayed as dd/mm/yyyy, e.g. 01/04/2018.

Long time: displayed as HH:MM:SS, e.g. 13:26:34

Medium time: displayed as HH:MM PM/AM, e.g. 01:26 PM

Short time: displayed as HH:MM, e.g. 13:26

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12
Q

Explain the Data type Character/String

A

A character is a single letter or digit represented by the codes from the character set.

A string is textual data in the form of a sequence of characters.

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13
Q

What is a pixel?

A

A smallest unit of a digital image that can be displayed and edited on a computer screen

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14
Q

What is Image resolution

A

Represents the quality of an image
More pixels = higher quality

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15
Q

What is a Bitmap Image?

A

Made up of Pixels

Stores details about every pixel on the image

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16
Q

Advantage of Bitmap

A

Can be compressed which reduces file size

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17
Q

Disadvantage of Bitmap

A

Storing every pixel means that file size is large

18
Q

What is a vector image?

A

stores information about the components that make up a image

19
Q

What is Streaming?

A

Streaming allows a video to be viewed on a website without needed to download it

20
Q

What is Buffer?

A

When the user if watching a part of a video, a buffer is used to download the next part of the video

21
Q

What is sample rate?

A

Number of audio sample captured per second to represent the sounds digitally

22
Q

What is Bit depth?

A

The number of bits used for each sound sample

23
Q

What is Bit rate?

A

The quantity of data measured in bits that is processed in a given amount of time.

24
Q

Explain Analogue to Digital Conversion

A

An analogue signal is a continuous varying signal that represents a physical quantity.

An analogue to digital converter (ADC) will sample a signal at regular time intervals.

Samples are then converted to digital format.

The frequency at which samples are taken is known as the sample rate, measured in Hertz (Hz).

25
Q

What is Data Portability

A

Data portability is the ability to transfer data from one computer to another or from one software application to another without having to re-enter the data.

26
Q

Expand JPEG

A

Joint Photographic Expert Group

27
Q

Expand TIFF

A

Tagged Image File Format

28
Q

Expand PNG

A

Portable Network Graphics

29
Q

Expand GIF

A

Graphic Interchange Format

30
Q

Expand CSV

A

Comma -separated-value

31
Q

Expand RTF

A

Rich Text Format

32
Q

Expand MIDI

A

Musical Instrument Digital Interface

33
Q

Expand MPEG

A

Moving Picture Experts Group

34
Q

Expand AVI

A

Audio Video Interleaved

35
Q

Expand PDF

A

Portable Document Format

36
Q

Expand WAV

A

Waveform Audio File

37
Q

Expand WMA

A

Windows Media Audio

38
Q

Explain Data Compression

A

Data compression Used to convert digital data to as small a size as possible while still maintaining the quality of the data contained in the file; allows data to be sent over the internet with acceptable transmission speeds

39
Q

Explain Lossy Compression

A

Reduces the file size by removing some data, such as reducing the number of colours used in an image.

40
Q

Explain Lossless Compression

A

Maintains the quality of the file, therefore no data is lost.

digital tech (10 decks)

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