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Digital Technology > Unit 1 Digital Data > Flashcards

Unit 1 Digital Data Flashcards

1
Q

What is data?

A

Consists of raw facts and figures with no meaning attached

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2
Q

What is information?

A

Data that has been processed, or data with meaning.

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3
Q

What does an information system do?

A

Processes data and produces information

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4
Q

What is a bit

A

A value of 0 or 1

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5
Q

How many bits in a byte

A

8 bits

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6
Q

How many bits is a nibble

A

4 bits

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7
Q

How many bytes in a kilobyte

A

1024 bytes

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8
Q

How many kilobytes in a megabyte

A

1024 kilobytes

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9
Q

How many megabytes in a gigabyte

A

1024 megabytes

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10
Q

How many gigabytes in a terabyte

A

1024 gigabytes

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11
Q

What are integer numbers

A

Positive or negative whole numbers with no decimal of fractional values

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12
Q

What are real numbers

A

Positive or negative whole numbers with decimal or fractional values

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13
Q

What is pixel

A

Smallest unit of a digital image

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14
Q

What is image resolution

A

Quality of the image, the greater the number of pixels in an image the higher the resolution and sharpness of the image

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15
Q

What are bitmap graphics made up of

A

A grid of pixels

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16
Q

What is a bitmap graphics image

A

Very complex

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17
Q

What is a bitmap graphics file size

A

File size can be very large as they have to store every detail

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18
Q

Are bitmap graphics compressed?

A

Yes, bitmap images are compressed to reduce file size but this may result in a loss of quality

19
Q

What is pixelation?

A

Pixelation can occur when you zoom in to enlarge a bitmap image - this is why bitmap images are poor quality when enlarged too much

20
Q

What are vector based graphics?

A

Not made up of a grid of pixels and store information about the compression that make up an image. EG. Lines, curves and shapes

21
Q

What do vector based graphics not depend on

A

Resolution for quality

22
Q

What is streaming

A

A process that allows a video to be viewed right away in website or app

23
Q

What is a buffer

A

Buffer is an allocated part of memory that is used to store a downloaded part of video before it is watched

24
Q

What is an analogue signal

A

Continuous varrying signal that represents a physical quantity such as sound

25
Q

What is data compression

A

Data compression is coverting digital data to as small a size as possible while maintaining the quality of the data contained in the file

26
Q

What is lossy compression

A

Reduces file size by removing some of the data, for example JPEG

27
Q

What is lossless compression

A

Maintains quality of file so no data is lost

28
Q

What is BMP

A

Bit mapped

29
Q

What is JPEG

A

Joint photographic experts group

30
Q

What is Tiff

A

Tagged image file format

31
Q

What is png

A

Portable network graphics

32
Q

What is pict

A

Picture format

33
Q

What is gif

A

Graphics interchange format

34
Q

What is txt

A

Text

35
Q

What is csv

A

Comma separated values

36
Q

What is rtf

A

Rich text format

37
Q

What is pdf

A

Portable document format

38
Q

What is WAV

A

Windows wave form

39
Q

What is mp3

A

Mpeg3

40
Q

What is WMA

A

Windows media audio

41
Q

What is MIDI

A

Musical intrument digital interface

42
Q

What is mpeg

A

Moving picture experts group

43
Q

What is MP4

A

Mpeg4

44
Q

What is AVI

A

Audio video interleaved

Digital Technology (2 decks)

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