IGCSEComputer ScienceCIETopic Questions1. Data Representation1.3 Data Storage and Compression

Data Storage and Compression (CIE IGCSE Computer Science)

Topic Questions

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1
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A company has a website that is stored on a web server.

The website hosts videos that users can stream. The company uploads new videos to the website.

i)
The videos are compressed before they are uploaded to the website.

Tick (✓) one box to show which statement is a benefit of compressing the videos.

A Data is encrypted. box enclose space space space end enclose
B Duration of each video will be reduced. box enclose space space space end enclose
C Less storage space on the web server is required. box enclose space space space end enclose
D More bandwidth is required when viewing the videos. box enclose space space space end enclose
[1]
ii)
Give two methods of compression that could be used to compress the videos.

1 .................................................................
2 ..................................................................
[2]

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2
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A music company has a website that allows users to stream music. The music is stored in sound files.

The sound files are compressed using lossless compression.

i)
Describe how the sound files are compressed using lossless compression.
 [4]
ii)
State one reason why the music company would compress the sound files using lossless, rather than lossy, compression.
 [1]
iii)
Give one benefit, to the user, of the music company compressing the sound files.
[1]
iv)
Give one drawback of the music company using lossless, rather than lossy, compression for the sound files.
 [2]

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3
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Tina is creating a website for charity events. She uses HTML to create the website.

 

Tina uses a microphone to record a welcome message for her website.

i)
She wants to compress the recording to make sure that the file is as small as possible for the website.

 Identify which type of compression she should use and describe how this would compress the file for the website.

Type of compression .....................................................................

Description

[4]

ii)
Give two benefits of compressing the file for the website.

Benefit 1 ......................................................................................

Benefit 2 ......................................................................................

[2]

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4
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Computer memories are measured in terms of the number of bytes.

(i)
What is meant by the term byte?
[1]
(ii)
The number of bytes in a Gigabyte can be written as 2x

What is the value of x?
[1]

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