IGCSEComputer ScienceCambridge (CIE)Topic Questions1. Data RepresentationData Storage & Compression

Data Storage & Compression (Cambridge (CIE) IGCSE Computer Science)

Topic Questions

18 mins7 questions

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Data Storage & Compression

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1a1 mark

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

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.

  • Data is encrypted.

  • Duration of each video will be reduced.

  • Less storage space on the web server is required.

  • More bandwidth is required when viewing the videos.

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1b2 marks

Give two methods of compression that could be used to compress the videos.

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21 mark

Jack has an MP3 file stored on his computer.

Tick (✓) to show whether the MP3 file is a lossy compressed file or a lossless compressed file or not a compressed file.

Tick (✓)

Lossy compressed file

Lossless compressed file

Not a compressed file

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31 mark

A student has a sound file that is too large to be stored on their external secondary storage device. The student compresses the sound file to make the file size smaller.

The compression method used reduces the sample rate and the sample resolution of the sound file.

Identify which type of compression has been used to compress the sound file.

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41 mark

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

State what is meant by the term byte

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13 marks

An image is stored on a computer. The image is 16‑bit colour and is 100 pixels high and 150 pixels wide.

Calculate the file size of the image in bytes.

Show all your working.

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15 marks

The following data is stored as a text file:

red, green, yellow, green, purple, blue, red, purple, blue, yellow, grey, black, pink, red,

Explain how lossless compression would compress this file.

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2a2 marks

Explain the difference between a megabyte (MB) and a mebibyte (MiB).

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2b2 marks

Calculate how many kibibytes (KiB) there are in 3 gibibytes (GiB)?

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