Question 1

What is the primary reason for using data compression in computer systems?

Accepted Answer

To reduce the amount of storage space needed for files.

Answer

To improve the security of data transmission.

Answer

To increase the speed of data processing.

Answer

To enhance the quality of audio and video.

Question 2

Which of the following is a drawback of using lossy compression?

Accepted Answer

It removes some original data, leading to a loss in quality.

Answer

It takes more time to compress files.

Answer

It increases the overall file size.

Answer

It makes data impossible to encrypt.

Question 3

Why is compression important for efficient data transmission over the internet?

Accepted Answer

It reduces the bandwidth required, speeding up data transfer.

Answer

It doubles the size of data packets, making transmission robust.

Answer

It allows multiple users to access the data simultaneously.

Answer

It increases data encryption, enhancing security.

Question 4

What is a key advantage of using lossless compression over lossy compression?

Accepted Answer

It preserves the original data without any quality loss.

Answer

It significantly reduces the file size more than lossy compression.

Answer

It accelerates the processing speed of the file.

Answer

It enhances the visual quality of images and videos.

Question 5

How does compression affect the storage capacity of a device?

Accepted Answer

Compression allows more files to be stored in the same amount of space.

Answer

Compression eliminates the need for data backups.

Answer

Compression increases the physical capacity of storage devices.

Answer

Compression divides the storage space equally among files.

Question 6

Which type of compression is typically used for streaming audio and video content online?

Accepted Answer

Lossy compression, because it reduces file size at the cost of some quality.

Answer

No compression, because quality is prioritized over speed.

Answer

Lossless compression, because it maintains original quality.

Answer

Hybrid compression, combining features of both lossy and lossless.

Question 7

What is one of the main disadvantages of using data compression?

Accepted Answer

Decompression can require additional processing time.

Answer

Compressed files cannot be encrypted for security.

Answer

It increases the overall power consumption of devices.

Answer

Files become more susceptible to data corruption.

Question 8

In what scenario would lossless compression be preferred over lossy compression?

Accepted Answer

When exact data restoration is necessary, such as in text files or legal documents.

Answer

When streaming media content where quality loss is acceptable.

Answer

When file size is the only concern, regardless of data quality.

Answer

When sharing visual content on social media platforms.

Question 9

Why might someone choose to use lossy compression for image files?

Accepted Answer

It significantly reduces file size, making them easier to share and store.

Answer

It allows for higher resolution images compared to lossless compression.

Answer

It provides enhanced image detail and sharpness.

Answer

It is the only way to ensure images can be used with all software.

Question 10

What is a key benefit of using compression for data backups?

Accepted Answer

It reduces the storage space required, allowing more backups to be saved.

Answer

It improves the speed at which data can be accessed and modified.

Answer

It eliminates the need for data encryption during storage.

Answer

It automatically organizes files into categories for easier retrieval.

Question 11

Why is data compression important in computer science?

Accepted Answer

It reduces the amount of storage space needed for files.

Answer

It makes files incompatible with different systems.

Answer

It slows down data transfer rates.

Answer

It increases the file size for easier downloading.

Question 12

What is one common method of data compression?

Accepted Answer

Lossless compression, which reduces file size without losing any data.

Answer

Simple compression, which keeps data unchanged but alters its access speed.

Answer

Redundancy compression, which duplicates data for safety.

Answer

Lossy compression, which magnifies data for better clarity.

Question 13

Which of the following is a disadvantage of lossy compression?

Accepted Answer

It permanently removes some data, which may affect quality.

Answer

It makes data unusable if decompressed.

Answer

It requires more computing power than lossless compression.

Answer

It increases the size of the file.

Question 14

How does file compression benefit data transfer over the internet?

Accepted Answer

By reducing file size, it speeds up data transfer.

Answer

By encrypting the data, it makes transfers secure.

Answer

By increasing file size, it enhances data accuracy.

Answer

By duplicating data, it ensures data redundancy.

Question 15

In what scenario might lossless compression be preferred over lossy compression?

Accepted Answer

When the original data must be perfectly reconstructed.

Answer

When compressing data for faster emails.

Answer

When working with video files for streaming.

Answer

When dealing with non-critical data archiving.

Question 16

What is a potential trade-off when using file compression?

Accepted Answer

Increased processing time due to compressing and decompressing data.

Answer

Improved data security without any downsides.

Answer

Files become completely lossless with no exceptions.

Answer

Unlimited storage capacity becomes available.

Question 17

Which of the following is an example of a lossless compression algorithm?

Accepted Answer

PNG, commonly used for image files with exact pixel preservation.

Answer

MP3, used for compressing audio with data loss.

Answer

MP4, a format for compressing video with decreased quality.

Answer

JPEG, which compresses images by removing some data.

Question 18

What is a common application of lossy compression?

Accepted Answer

Reducing the size of multimedia files like audio and video.

Answer

Maintaining exact data in text file formats.

Answer

Enhancing the security of encrypted files.

Answer

Increasing the accuracy of scientific computations.

Question 19

Why might data compression be necessary for mobile devices?

Accepted Answer

To save limited storage space and improve data transfer rates.

Answer

To ensure all apps are encrypted securely by default.

Answer

To enhance the device's graphical processing power.

Answer

To increase the battery life without charging.

Question 20

What happens to image quality when lossy compression is applied?

Accepted Answer

The quality is reduced because some data is discarded.

Answer

The quality remains unchanged with no data loss.

Answer

The quality decreases only when no compression is applied.

Answer

The quality improves as more pixels are added.

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