Eduqas GCSE Computer Science data representation and storage overview quiz quiz

41

53

29

45

2

4

8

16

EA

AE

E8

DA

When the two numbers being added together are exactly equal

Whenever a single column in the sum happens to add up to zero

When the result needs more bits than are available

Whenever any of the numbers being added are negative values

It divides the number by 4

It multiplies the number by 2

It has no effect on the value

It multiplies the number by 4

-128

+128

-127

+256

Add 1, then invert all the bits

Invert all the bits, then add 1

Invert all the bits only

Add 1 only

64

128

256

1024

ASCII was simply far too slow for modern computers to process quickly

ASCII used up far too much storage space for each individual character

ASCII could not represent the characters of other languages

ASCII was completely unable to store any numbers or digits at all

160000 bytes

2500 bytes

20000 bits

20000 bytes

sample rate times bit depth times seconds

sample rate times bit depth, with no duration included

width times height times the colour depth of the image

bit depth times seconds, leaving out the sample rate entirely

No data at all is lost and the original file is restored back exactly as it was

It only ever works on plain text files and never on any other type of file

Data is permanently removed and the original cannot be fully restored

It actually makes the files much larger rather than smaller in size

A holiday photo for a website

A streamed music track

A low-quality video preview

A program executable file

It replaces runs of the same value with the value and a count

It simply deletes every second pixel from the original image data

It converts all of the data into hexadecimal to save on storage space

It removes the fine detail that the human eye cannot easily see