Digital Data

Question 1

How many bytes are in a kilobyte

Answer 1

1024 bytes

Question 2

What is information

Answer 2

When data has been processed and given meaning

Question 3

What are the data types

Answer 3

Numeric, date/time, character/string

Question 4

What is a pixel

Answer 4

The smallest Unit of a digital image that can be displayed and edited

Question 5

Image resolution

Answer 5

The qualify of an image

The greater the resolution, the greater the file size

Question 6

Bitmap graphics

Answer 6

Store details about every individual pixel of the image

Size can be large

It can be compressed

Question 7

Vector -based graphics

Answer 7

Store information about the components that make up an image

Components are based on mathematical objects

Question 8

Streaming

Answer 8

Allows a video to be viewed ou a website without a time delay.

Question 9

Buffer

Answer 9

Part of the memory used to store a downloaded part of a video before watching it

Question 10

Sample rate

Answer 10

Number of audio sound samples captured per second to represent the sounds digitally

Question 11

Bit depth

Answer 11

The number of bits used for each sound sample

Question 12

Bit rate

Answer 12

The quantity of data measured in bits that is processedin a givenamount of time

Question 13

What are frequency samples measured in

Answer 13

Hertz (Hz)

Question 14

Data portability

Answer 14

The ability to transfer data from one computer to another without having to re-enter the data

Question 15

JPEG

Answer 15

Joint photographic experts group

Supports compression of images

Question 16

TIFF

Answer 16

Tagged image file format

Store bitmapped graphics

Question 17

PNG

Answer 17

Portable network graphics

Allow data compression of bitmapped graphics

Question 18

PICT

Answer 18

Standard file format for apple graphics

Question 19

GIF

Answer 19

Graphics interchange format

Supports bitmapped image file format

Animated GIFs combine a series of GIF images and display them one after the other

Question 20

Txt

Answer 20

A plain text document that contains no text formatting

Question 21

CSV

Answer 21

Comma-separated value

Text format file used by database and spread sheet applications

Question 22

RTF

Answer 22

Rich text format

Used for text-based documents eg -word processing

Question 23

MP3

Answer 23

File format for compressing a sound

Question 24

MP4

Answer 24

Compresses both sound + video

Question 25

MIDI

Answer 25

Musical instrument digital interface

Allows sound samples to be interchanges between different digital musical instruments

Question 26

MPEG

Answer 26

Motion pictures experts group

A set of standards for compressing digital videos

Question 27

AVI

Answer 27

Audio video interleaved

Multimedia file format

Question 28

WAV

Answer 28

Windows audio waveform

Stores audio bit stream on PCs

Question 29

WMA

Answer 29

Windows media audio

Audio data compression file format

Question 30

Data compression

Answer 30

Used to reduce file size while maintaining the qualifyof the data contained in the file

Question 31

Lossy compression

Answer 31

Reduces the tile size by removing some data. This can result in a small reduction in the qualify of an image

Example- JPEG

Question 32

Lossless compression

Answer 32

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

Example- winzip