What is one of the benefits of compressing files and data before sending them over the internet?

It increases the security of the data

It enhances the quality of the data

It increases the cost of data transmission

How does compression affect data allowances?

It makes data allowances go further

It uses up data allowances more quickly

It has no effect on data allowances

What may become possible with data when files are compressed?

It may be possible to stream data

It may be possible to delete data

It may be possible to corrupt data

It may be possible to encrypt data

What is one of the benefits of reducing video, sound, and image file sizes?

Data cannot be sent as fast as it is played

How does compression affect streaming content?

Streaming content is possible as data can be sent as fast as it is played

Streaming content is not possible

Streaming content requires more data

What is the impact of compression on image heavy websites?

They require additional plugins

They are not affected by compression

What is a characteristic of lossy compression?

It permanently loses some data.

It enhances the quality of data.

It increases the size of the original data.

What is a characteristic of lossy compression techniques?

They reduce the file size but lose some of the data permanently.

They increase the file size while maintaining data integrity.

They reduce the file size without losing any data.

They enhance the quality of the original data.

What happens to the uncompressed data after using lossy compression?

It is not the same as the original.

It remains exactly the same as the original.

It is enhanced with better quality than the original.

It is lost and cannot be recovered.

How is the file recreated after lossy compression?

By using algorithms to "guess" the missing content.

By using the original data without any changes.

By asking the user to input the missing data.

By randomly generating the missing content.

What happens to the file size when an image undergoes lossy compression?

The file size remains the same.

The file size becomes unpredictable.

What is a common way of reducing an image file size when using a lossy format?

Grouping similar colours together

Increasing the resolution of the image

Adding more different colours to the image

What is the result of grouping similar colours together in a lossy image format?

It reduces the number of different colours used in the image

It makes the image higher quality

What are "digital artefacts" or "compression artefacts" known to cause in images?

Images to appear granulated or produce unusual colour blocks

What is an important consideration when using lossy compression for audio files?

Balancing quality and file size

Ensuring the file cannot be copied

Making the file compatible with all devices

Is lossy compression suitable for compressing computer programs?

No, because it can introduce errors that affect the program's functionality.

Yes, because it reduces the file size significantly.

Yes, because it enhances the performance of the program.

No, because it makes the program run faster.

What does lossless compression do?

Reduces file size without losing data.

Increases file size without losing data.

Reduces file size by losing some data.

Increases file size by adding more data.

What is the characteristic of a file that has been compressed using lossless compression techniques?

The uncompressed file is the same as the original.

The uncompressed file is different from the original.

The file loses some of the original data.

The file is compressed without using any algorithms.

Which of the following are methods of lossless compression?

Run Length Encoding and Huffman encoding

Data Compression Quiz

Authored by J Spensley

Computers

7th Grade

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39 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the purpose of compression in data handling?

To increase the size of data

To make data transmission more secure

To reduce the size of data

To enhance the quality of data

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is a characteristic of lossy compression?

It allows the original data to be perfectly reconstructed from the compressed data

It reduces file size by permanently eliminating certain information

It is primarily used for text and data files

It increases the size of the data to improve quality

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is a difference between lossy and lossless compression techniques?

Lossy compression can be used for executable files, while lossless cannot

Lossless compression reduces file size without losing any data, while lossy compression does not guarantee this

Lossy compression is never used in multimedia files, while lossless is commonly used

Lossless compression is a newer technology compared to lossy compression

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is a method of lossless data compression?

MPEG

JPEG

Run Length Encoding

MP3

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Huffman coding is used for:

Lossy compression of images

Lossless compression of data

Encrypting data for secure transmission

Expanding data size for better quality

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the resolution of a typical HD TV?

1280 x 720 pixels

1920 x 1080 pixels

2560 x 1440 pixels

3840 x 2160 pixels

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How many pixels are there per frame in a typical HD TV resolution?

1,073,741,824 pixels

2,073,600 pixels

3,145,728 pixels

8,294,400 pixels

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Data Compression Quiz

What is the purpose of compression in data handling?

Which of the following is a characteristic of lossy compression?

What is a difference between lossy and lossless compression techniques?

Which of the following is a method of lossless data compression?

Huffman coding is used for:

What is the resolution of a typical HD TV?

How many pixels are there per frame in a typical HD TV resolution?

What is the colour depth used per pixel in a typical HD TV?

How many bits are there in each frame of a typical HD TV?

How many bits per second are typically used for images in films recorded at 24-30 frames per second?

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