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a level computing aqa > Data representation > Flashcards

Data representation Flashcards

1
Q

What are natural numbers?

A

A positive whole number used for counting

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2
Q

What is the notation for an infinite set of natural numbers

A

N

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3
Q

What are integer numbers

A

A positive or negative whole number, includes 0

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4
Q

What is the notation for integer numbers

A

Z

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5
Q

What are rational numbers

A

Any number which can be expressed as a ratio or fraction

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6
Q

What is the notation for a rational number

A

Q

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7
Q

What are real numbers

A

Any possible real world quantity, can be whole numbers and decimals. Does not include imaginary numbers such as infinity

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8
Q

What is the notation for real numbers

A

R

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9
Q

What are ordinal numbers

A

A number used to describe the numerical position of objects (e.g: he came second in a race, I took the fourth object from the top)

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10
Q

What is the notation for ordinal numbers

A

There is no notation for ordinal numbers

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11
Q

What number system is denary

A

Base 10

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12
Q

What does base 10 mean

A

There are 10 different values to choose from (0-9)

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13
Q

What number system is binary

A

Base 2

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14
Q

What does base 2 mean

A

There are only 2 values to choose from (0 and 1)

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15
Q

What base is hexadecimal

A

Base 16

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16
Q

What does base 16 mean

A

There are 16 values (0-F)

17
Q

How do you convert binary to hexadecimal

A

Split the binary into 4 bit segments. 1011 0011
Add the 4 bits. 1011 = 11, 0011 = 3
Convert denary to hexadecimal 11 = B, 3 = 3
1011 0011 = B3

18
Q

What can a single bit represent

A

Either 1 or 0

19
Q

What is a byte

A

8 bits

20
Q

What are the binary prefixes (base 2)

A

Kibi, 1024 bits
Mebi, 1,048,576 bits
Gibi, 1,073,741,824 bits
Tebi, 1,099,511,627,776 bits

21
Q

What are the decimal prefixes (base 10)

A

Kilo, 1000 bits
Mega, 1,000,000 bits
Giga, 1,000,000,000 bits
Tera, 1,000,000,000,000 bits

22
Q

What happens to the most significant bit in two’s compliment

A

Turns negative

23
Q

How do you turn a positive to a negative in twos compliment

A

Reverse the positive binary (e.g 01110101 turns into 10001011 or 117 to -117) (this works both ways)

a level computing aqa (3 decks)

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