Compression

Multiple Choice

What is compression?

• Increasing the quality of a file

• Encrypting data for security

• Reducing the number of bits in a file

• Increasing file resolution

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Why is compression used?

• To improve image resolution

• To reduce file size and transfer time

• To increase bandwidth

• To make files more secure

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What is the main purpose of compression?

• To reduce the file size

• To encrypt the file

• To increase the file size

• To change the file format

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What are the types of compression?

• Dynamic compression

• Complex compression

• Lossless

• Plossess

• Lossy

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What does Lossy Compression do to files?

• Increases the file size and keeps the same quality
• Eliminates no information at all
• Decreases the file size and keeps the same quality
• Eliminates unnecessary information in a file to reduce file size

Multiple Choice

What is Lossless Compression?

• No information is lost but file size is increased
• There is no loss of information at all after compression
• Files which have the exact same data after compression
• Compression involves an algorithm

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What is the main difference between lossy and lossless compression?

• Lossy compression is irreversible, lossless compression is reversible

• Lossy compression is only for images, lossless compression is for all types of data

• Lossy compression is faster, lossless compression is slower

• Lossy compression reduces file size, lossless compression does not

Multiple Choice

Which type of compression is suitable for documents and executable files?

• Both types of compression

• None of the above

• Lossless compression

• Lossy compression

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Lossy compression would be suitable for text files

• True

• False

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What type of compression does the ZIP format use?

• Lossy
• Lossless

Multiple Choice

What type of compression would you use to compress a video?

• Lossy
• Lossless

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What type of compression would you use to compress a text file?

• Lossy
• Lossless

Multiple Choice

When Lossy compression is used data is lost?

• True
• False

Multiple Choice

What is a common use of data compression?

• Storing pictures, songs, and movies

• Sending data over the internet

• Compressing web pages

• All of the above

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Compression that can compress data files without losing any of the information is called

• Lossy

• Lossless

Multiple Choice

Makes the file smaller by giving repeated patterns/colours a specific code

• Lossy Compression
• Lossless Compression

Multiple Choice

What is compression?

• To convert one file to another
• To reduce the size of data to save space
• To minimise the time taken for a file to be download
• To compress something by pressing it hard

Multiple Choice

Ava is trying to send a large video file to Eesha and Noah via email, but the file is too large. What should Ava do to make the file smaller so it can be sent?

• Slow down the data transfer

• Increase the size of the file

• Decrease the storage capacity of her device

• Compress the file to reduce its size

Multiple Choice

Leo, Lily, and Priya are working on a school project where they need to include images, sound, and video. Which type of compression should they use for these multimedia elements?

• Both types of compression

• Lossless compression

• Lossy compression

• No compression needed

Multiple Choice

Amelia is working on a project where she needs to compress some image files. She is considering using lossy compression. What could be the main drawback of Amelia using lossy compression for her project?

• It will increase the size of her image files

• It will reduce the quality of her images

• It is not suitable for any type of data she has

• It is less effective than the lossless compression method that Priya and Arthur are using

Multiple Choice

Lily is working on a project where she needs to store a large number of documents and executable files. She wants to ensure that no data is lost in the process. Which type of compression should she use?

• Lossy compression

• Lossless compression

• No compression needed

• Both types of compression

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William is working on a project where he needs to send a large video file over email. He decides to use lossy compression. What will be the effect of this on the file size?

• Greatly reduces the file size

• Slightly reduces the file size

• Increases the file size

• Does not affect the file size

Multiple Choice

Ishaan is working on a project where he needs to compress some data without losing any information. Rosie suggests using lossless compression. For which type of data would this method be most suitable?

• All types of data

• Images and video

• Sound and music

• Documents and executable files

Multiple Choice

Thomas is working on a project where he needs to store a large amount of data without losing any information. Which advantage of lossless compression would be most beneficial to him?

• It reduces the quality of the image or sound

• It greatly reduces the file size

• It can be used for all types of data

• It is less effective than lossy compression

Multiple Choice

Eesha is working on a project where she needs to compress some data. She is wondering what determines the type of compression that can be used for her data. Charlie suggests it's the file size, Matilda thinks it's the internet speed, and another friend suggests it's the type of storage device. Eesha, however, believes it's the type of data. Who is correct?

• Charlie - File size

• Matilda - Internet speed

• Friend - Type of storage device

• Eesha - Type of data

Multiple Choice

Arjun is uploading his vacation photos to a cloud storage. He decides to use lossy compression for his images. What could be the main reason for Arjun's decision?

• He wants to improve the quality of his photos

• He wants to increase the size of his photos

• He wants to reduce the quality of his photos

• He wants to reduce the file size and upload time