Data Rep

Question 1

Binary

Answer 1

A base 2 number system that uses the digits only 0 and 1

Question 2

Bit

Answer 2

A single binary digit, a 0 or a 1

Question 3

Why Binary

Answer 3

Computers consist of transistors which can have 2 states on or off. Binary represents these two states 0 for off and 1 for on

Question 4

Hexadecimal

Answer 4

A base 16 number system that uses the digits 0-9 and the letters A-F to represent the digits 10-15

Question 5

ASCII

Answer 5

The American Standard Code for Information Interchange is an agreed standard for recording characters as pre-specified binary numbers

Question 6

Character set

Answer 6

A character set is used to describe the possible characters that can be represented in a computer system like ASCII and Unicode

Question 7

Standard ASCII

Answer 7

ASCII that uses 7 bits to represent 128 characters

Question 8

Extended ASCII

Answer 8

ASCII that uses 8 bits to represent 256 characters

Question 9

Unicode

Answer 9

A character set developed for every language in the world using two bytes to store 2^16 possible characters but can be extend to 3 or 4 bytes making it possible to store 2^24 possible characters or 2^32 possible character respectively

Question 10

Pixel

Answer 10

Small dots that make up a bitmap image

Question 11

Resolution

Answer 11

The number of pixels per square inch measured in dpi

Question 12

Colour Depth

Answer 12

The number of bits available for colours in an image

Question 13

Metadata

Answer 13

Data about the properties of data

Question 14

Sample

Answer 14

A digitally recorded fragment of sound that is taken from an existing track or environment

Question 15

Sample rate

Answer 15

The number of audio samples taken per second

Question 16

Sample size

Answer 16

The number of bits available for an audio sample

Question 17

Bit rate

Answer 17

Number of bits processed per second

Question 18

Compression

Answer 18

Process of making a file smaller

Question 19

Lossy compression

Answer 19

Permanently removing parts of the data to make a file smaller usually used for audio, image and video files

Question 20

Lossless compression

Answer 20

A form of compression that makes the file smaller without losing data

Question 21

Operator

Answer 21

A special symbol that carries out a function

Question 22

Operand

Answer 22

Second part of the opcode that is manipulated by the CPU according to the operator

Question 23

Check Digit

Answer 23

An extra value at the end of data to confirm that data has been scanned correctly