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AQA Computer Science GCSE > Data Representation > Flashcards

Data Representation Flashcards

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1
Q

Q: What is the term for a single point in an image?

A

A: A pixel

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2
Q

Resolution is the number of what per inch?

A

pixels

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3
Q

What is the name for the method of compression where images are represented as groups of pixels (e.g. 3 red, 5 blue, 6 orange) rather than individual pixels (red,red,red,blue,blue,blue,blue,blue,orange,orange…)?

A

Lossless compression

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4
Q

Name an example of a file format that uses lossless compression

A

Png

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5
Q

Name an example of a file format that uses lossy compression

A

Jpg

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6
Q

What base is a hexadecimal number system?

A

16

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7
Q

How are alphanumeric symbols represented in binary?

A

They are transferred into a unique binary 7 digit number in the ASCII table where each symbol has a unique digit.

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8
Q

What does ASCII stand for?

A

American Standard Code for Information Interchange

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9
Q

How are colours represented?

A

Colours are usually shown in GUIs as a hexadecimal number 6 digits long representing the RGB ratio.

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10
Q

Why is analogue sound better than digital?

A

Analogue sound is represented as free flowing waves rather than being limited to the sample rate of digital, Digital sound is therefore a more limited version as the sound patterns’ frequency cannot exceed the sample rate of the speaker.

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11
Q

What is the Base system of binary?

A

Base 2

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12
Q

Which numbers are used in binary?

A

0 and 1

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13
Q

Binary is a base what system?

A

2

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14
Q

Which 2 numbers are used in Binary?

A

1 and 0

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15
Q

What is Binary?

A

A numerical system in which there are only 2 values for each digit 1 and 0.

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16
Q

Why can computers only operate using binary data?

A

Computers cannot easily read data from switches so they operate on whether a switch is in an on or off state and function differently depending on each.

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17
Q

What is 4 bits?

A

A nibble

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18
Q

What would happen if you added 2 8 bit numbers with a combined value of over 255?

A

The sum results in an overflow error causing the additional 256, which would require an additional bit to be stored, to be lost.

19
Q

What base is hexadecimal?

A

16

20
Q

How are we able to write the values 10 - 15?

A

As the letters A - F.

21
Q

Why is it useful to use hexadecimal numbers?

A

When storing large binary digits as 4 binary numbers are able to be converted into a single hexadecimal digit i.e. 1011 = B. This makes it far easier for developers and designers to read long strings of binary data.

22
Q

When is hexadecimal representation of data used?

A

When storing data on colours i.e. the common method is a 6 digit hexadecimal number representing the RGB values of a colour.

23
Q

What base is a hexadecimal number system?

A

16

24
Q

What base is a octal number system?

A

8

25
Q

How are alphanumeric symbols represented in binary?

A

They are transferred into a unique binary 7 digit number in the ASCII table where each symbol has a unique digit.

26
Q

What does ASCII stand for?

A

American Standard Code for Information Interchange

27
Q

How are colours represented?

A

Colours are usually shown in GUIs as a hexadecimal number 6 digits long representing the RGB ratio.

28
Q

What is the Base system of binary?

A

Base 2

29
Q

Which numbers are used in binary?

A

0 and 1

30
Q

Binary is a base what system?

A

2

31
Q

Which 2 numbers are used in Binary?

A

1 and 0

32
Q

What is Binary?

A

A numerical system in which there are only 2 values for each digit 1 and 0.

33
Q

Why can computers only operate using binary data?

A

Computers cannot easily read data from switches so they operate on whether a switch is in an on or off state and function differently depending on each.

34
Q

What is 4 bits?

A

A nibble

35
Q

What would happen if you added 2 8 bit numbers with a combined value of over 255?

A

The sum results in an overflow error causing the additional 256, which would require an additional bit to be stored, to be lost.

36
Q

What base is hexadecimal?

A

16

37
Q

How are we able to write the values 10 - 15 in hexadecimal?

A

As the letters A - F.

38
Q

Why is it useful to use hexadecimal numbers?

A

When storing large binary digits as 4 binary numbers are able to be converted into a single hexadecimal digit i.e. 1011 = B. This makes it far easier for developers and designers to read long strings of binary data.

39
Q

When is hexadecimal representation of data used?

A

When storing data on colours i.e. the common method is a 6 digit hexadecimal number representing the RGB values of a colour.

40
Q

What is the term for a single point in an image?

A

a pixel

41
Q

Resolution is the number of what per inch?

A

pixels

42
Q

What is the name for the method of compression where images are represented as groups of pixels (e.g. 3 red, 5 blue, 6 orange) rather than individual pixels (red,red,red,blue,blue,blue,blue,blue,orange,orange…)?

A

Lossless compression

43
Q

Name an example of a file format that uses lossless compression

A

Png

44
Q

Name an example of a file format that uses lossy compression

A

Jpg

AQA Computer Science GCSE (16 decks)

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