Nigel wants to send a large text file electronically to Mashuda. Describe how the size of the text file can be reduced. This file will be transmitted to Mashuda as an email attachment. Mashuda then stores it on her computer. Explain how checksums can be used to verify that the file has not been corrupted during transmission or data storage.

2210_s16_qp_12

THEORY

2016

Paper 1, Variant 2

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Steffi has a number of files of different sizes that contain her work. Tick (3) to show whether each statement is true or false. Statement true (3) false (3) 47KB is larger than 10MB. 250bytes is smaller than 0.5MB. 50GB is larger than 100MB. 1TB is smaller than 4GB.

2210_s17_qp_11

THEORY

2017

Paper 1, Variant 1

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Michele wants to email a file to Elsa. The file is too large so it must be compressed. Name two types of compression that Michele could use. Compression type 1 Compression type 2 The file Michele is sending contains the source code for a large computer program. Identify which type of compression would be most suitable for Michele to use. Explain your choice. Compression type Explanation

2210_s18_qp_11

THEORY

2018

Paper 1, Variant 1

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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)

2210_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

2210_s18_qp_12

THEORY

2018

Paper 1, Variant 2

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The following text is stored as a text file: She sells sea shells on the seashore. The shells that she sells are sea shells I am sure. Explain how lossless compression would compress this file.

2210_s19_qp_11

THEORY

2019

Paper 1, Variant 1

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Data can be measured in bits. Give the name of the data storage measurement that is equal to 8 bits. State how many bits there are in a kibibyte (KiB). Give the name of the data storage measurement that is equal to 1024 gibibytes (GiB). A 16-bit colour image has a resolution of 512 pixels wide by 512 pixels high. Calculate the file size of the image in kibibytes (KiB). Show all your working. Answer KiB

2210_s24_qp_12

THEORY

2024

Paper 1, Variant 2

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MP3 file compression reduces the size of a music file by 90%. A music track is 80 MB in size. Calculate the file size after compression. How many MP3 files of the size calculated above could be stored on an 800 MB CD? Explain how MP3 files retain most of the original music quality. State the type of file compression used in MP3 files. Name another file compression format.

2210_w15_qp_13

THEORY

2015

Paper 1, Variant 3

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Identify whether the four statements about file compression are correct by writing TRUE or FALSE in the following table. Statement TRUE or FALSE MIDI files store the actual music notes in a compressed format JPEG files are examples of lossless file compression MP3 files are, on average, 90% smaller than the music files stored on a CD MP4 files are examples of lossy file compression

2210_w16_qp_12

THEORY

2016

Paper 1, Variant 2

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Optical storage media can be used to store data. Describe how the data is read from a Compact Disc (CD). Kamil wants to store a 16-bit colour image file. The image size is 1000 pixels. Calculate the size of the file. Give your answer in bytes. Show your working. Working Answer bytes Describe the differences between primary and secondary storage.

2210_w17_qp_13

THEORY

2017

Paper 1, Variant 3

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