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Computer Science GCSE > 1.2 Memory And Storage > Flashcards

1.2 Memory And Storage Flashcards

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1
Q

Bit

A

1 or 0

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2
Q

Nibble

A

4 bits

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3
Q

Byte

A

8bits

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4
Q

Kilobyte

A

1024 bytes (1000)

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5
Q

Megabyte

A

1024 kilobytes (1000 )

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6
Q

Gigabyte

A

1024 megabytes

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7
Q

Terabyte

A

1024 gigabytes

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8
Q

Petabyte

A

1024 terabytes

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9
Q

Why binary

A

Easier to represent only 2 states using electrical components

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10
Q

Overflow errors occur

A

When the number you are presenting is larger than 255 and you need an additional bit

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11
Q

Left shift is

A

Multiplication

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12
Q

Right shift is

A

Division

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13
Q

Hex

A

0123456789 ABCDEF

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14
Q

Character set

A

A set of characters each with a binary value assigned

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15
Q

ASCII is 7 bits how many characters?

A

127

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16
Q

Extended ASCII is 8 bits how many characters

A

255

17
Q

Colour depth

A

Number of bits needed to store each pixel

18
Q

Meta data

A

Extra info about an image

19
Q

Greater the colour depth / resolution greater the…

A

File size

20
Q

Sound file size calculation

A

Number of samples per second x number of bits per sample x length of sample

21
Q

Sample rate

A

The number of samples taken per second (measured in Hertz)

22
Q

Compression

A

Compression reduces the size of a file so it takes up less space

23
Q

2 advantages of compression

A

Maximise amount you can store
Smaller files are quicker to transfer and download

24
Q

Lossy

A

Loses data

25
Q

Lossless

A

Doesn’t lose data

26
Q

Order of byte

A

Byte kilobyte megabyte gigabyte terabyte petabyte

27
Q

RAM

A

Random access memory

28
Q

ROM

A

Read only memory

29
Q

Primary storage

A

Storage needed for the computer to function

30
Q

ROM RAM what and what

A

Registers and cache

31
Q

RAM does what

A

Keep data currently in use so the CPU can access it quickly

32
Q

ROM has what

A

Uneditable info that starts bootstrap (instructions needed to boot computer system)

33
Q

Registers and cache are found

A

In the CPU

34
Q

Registers do what

A

Have specific data and instructions

35
Q

Cache do what

A

Store frequently used instructions

36
Q

Which one isn’t volatile

A

ROM

37
Q

What does volatile mean

A

Will disappear if power is lost

Computer Science GCSE (1 decks)

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