Data Representation

Question 1

Denary (Decimal)

Answer 1

The base-10 number system, using digits 0 to 9.

Question 2

Binary

Answer 2

The base-2 number system, using only 0s and 1s. Used internally by all modern computers.

Question 3

Hexadecimal (Hex)

Answer 3

The base-16 number system, using digits 0–9 and letters A–F. Useful for compact binary representation.

Question 4

Binary Shift

Answer 4

Moving bits to the left or right to multiply or divide by powers of 2.

Question 5

Overflow

Answer 5

Occurs when a calculation produces a result too large for the allocated number of bits.

Question 6

Underflow

Answer 6

Occurs when a calculation produces a result too small to be represented
accurately.

Question 7

Character Set

Answer 7

A list of characters that can be recognised by a computer and the binary codes used to represent them.

Question 8

ASCII (American Standard Code for Information Interchange)

Answer 8

A 7-bit character set used to represent text in computers and devices.

Question 9

Unicode

Answer 9

A character encoding standard that can represent characters from most of the world’s writing systems.

Question 10

Pixel

Answer 10

The smallest controllable element of a picture on a screen.

Question 11

Image Resolution

Answer 11

The number of pixels in an image, typically width × height.

Question 12

Colour Depth

Answer 12

The number of bits used to represent the colour of a single pixel.

Question 13

Metadata

Answer 13

Data that describes other data, e.g. file type, resolution, and colour depth in animage file.

Question 14

Sample Rate

Answer 14

The number of samples taken per second during sound recording, measured in Hertz (Hz).

Question 15

Bit Rate

Answer 15

The number of bits used per second of audio, calculated by sample rate × bit depth.

Question 16

Sound Sampling

Answer 16

The process of measuring the amplitude of a sound wave at regular intervals.