1.3. Data storage and compression
A subsection of Computer Science, 0478, through 1. Data representation
Listing 10 of 46 questions
A wildlife photographer stores their digital images on a computer. Complete the table by defining each term about images. Image term Definition pixel resolution One of the images has a resolution of 1000 × 1000 and a colour depth of 2 bytes. Calculate the file size of the image. Give your answer in bytes. Show your working. Working space File size bytes The photographer decides to purchase a solid‑state storage device to back up their images. Complete the description of solid‑state storage. Use the terms from the list. Some of the terms in the list will not be used. You should only use a term once. binary denary electrons grid neutrons non‑volatile RAM star transistors virtual volatile Solid‑state storage is This means that the data is not lost when the power is turned off. Solid‑state storage is made of that are laid out in a . Gates are used to control the flow of the through the transistors. This changes the data in the transistors from 1 to 0, or from 0 to 1. The photographer compresses an image file before it is emailed. Give one reason why a file is compressed.
0478_m23_qp_12
THEORY
2023
Paper 1, Variant 2
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Different units of data can be used to represent the size of a file, as it changes in size. Fill in the missing units of data, using the list given: • byte • gigabyte (GB) • megabyte (MB) • nibble The units of data increase in size from smallest to largest. Smallest bit ……………………………………………… ……………………………………………… kilobyte (kB) ……………………………………………… ……………………………………………… Largest terabyte (TB)
0478_s18_qp_12
THEORY
2018
Paper 1, Variant 2
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Nancy has captured images of her holiday with her camera. The captured images are stored as digital photo files on her camera. Explain how the captured images are converted to digital photo files. Nancy wants to email the photos to Nadia. Many of the photos are very large files, so Nancy needs to reduce their file size as much as possible. Identify which type of compression would be most suitable for Nancy to use. Explain your choice. Compression type Explanation
0478_s18_qp_12
THEORY
2018
Paper 1, Variant 2
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Questions Discovered
46