# AQA Paper 2 - Fundamentals of data representation

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What is a natural number?
Integers
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What is a rational number?
A float value
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What is an irrational number?
A number that cannot be represented by integers or fractions
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What is a real number?
Positive or negative integers, fractions or decimals
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What is an ordinal number?
Numbers that use letters to represent a place (1st etc)
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What is a number base?
The possible numbers/letters a character can be
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How big is a byte in bits?
8
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How big is one KibiByte?
2^10 B
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How big is one KiloByte?
10^3 B
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What is unsigned binary?
Binary without a sign bit at the start
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What is signed binary?
Binary with a sign bit at the start
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What is two's compliment?
Making the first bit negative in a binary number
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What is Unicode?
A system for encoding characters from different cultures
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What is a parity bit?
A bit that checks if the 7 bits before it are odd or even
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What is majority voting?
Where each bit is sent three times and the majority bit will be taken
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What is a checksum?
Where input is fed through an algorithm to get a quantifiable result to verify integrity
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What is a check digit?
A digit used to verify the correct scanning of a barcode
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What is the resolution of an image?
The pixels in an image
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What is the size of an image calculated by?
Resolution x Colour Depth
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What is the advantage of vector graphics?
Infinitely Scalable
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How do you calculate sound bit rate?
bit depth * sample rate
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How do you calculate the size of a sound file?
bit rate * length
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What is Run Length Encoding (RLE)?
Use of numbers next to letters to represent repeated characters
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## Other cards in this set

### Card 2

#### Front

What is a rational number?

A float value

### Card 3

#### Front

What is an irrational number?

### Card 4

#### Front

What is a real number?

### Card 5

#### Front

What is an ordinal number?