Evaluating Compression Methods (4 marks)
Evaluate the impact of using lossy compression on a text file and a music file. Discuss the consequences for each file type.
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Pearson Edexcel (2020)
The Stored Program Concept. (2 marks)
Describe the von Neumann stored program concept.
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Identifying Data Compression Types (1 mark)
Identify whether the following statement is true or false: “Lossless compression methods can significantly reduce the file size without any loss of data quality.” (Indicate True or False for one mark)
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Comparing Compression Methods (2 marks)
Compare lossless and lossy compression in terms of their methodology.
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Calculate File Size in Mebibytes (2 marks)
Calculate the file size in mebibytes of a text document that contains 450,000 characters, assuming each character is stored in one byte.
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Gibibytes and Storage (3 marks)
A video file is 1.5 gibibytes in size. How many such files can be stored on a 16 gibibyte USB stick?
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Calculating Storage Needs (2 marks)
A database uses 2 bytes to store a single character. Write an expression to calculate the file size in bytes, then carry out the calculation, for a database entry that contains 3,000 characters.
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Bitmap Storage Requirements (4 marks)
A photograph is stored as a 24-bit bitmap image with a resolution of 1280 x 1024 pixels. Calculate the file size in kibibytes.
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Understanding Data Compression (2 mark)
Explain why data compression is needed in computer systems.
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