lossy and lossless compresion

Question 1

What is lossy compression?

Answer 1

A method of data compression that reduces file size by permanently eliminating some data.

Question 2

True or False: Lossless compression allows for the original data to be perfectly reconstructed from the compressed data.

Answer 2

True

Question 3

Fill in the blank: JPEG is an example of a ________ compression format.

Answer 3

lossy

Question 4

Which of the following is a characteristic of lossless compression? A) Data is permanently lost, B) Original data can be fully restored, C) Typically results in smaller file sizes than lossy.

Answer 4

B) Original data can be fully restored

Question 5

What is the primary advantage of lossy compression?

Answer 5

Significantly reduced file sizes.

Question 6

Name a common lossless compression format.

Answer 6

PNG

Question 7

True or False: Lossy compression is typically used for text files.

Answer 7

False

Question 8

What type of files is lossless compression commonly used for?

Answer 8

Text files and certain image formats.

Question 9

Fill in the blank: Lossy compression is often used for ________ and ________ files.

Answer 9

audio; video

Question 10

Which compression method is generally preferred for web images to save bandwidth?

Answer 10

Lossy compression

Question 11

What does the term ‘bitrate’ refer to in the context of audio compression?

Answer 11

The number of bits that are processed per unit of time.

Question 12

True or False: A higher bitrate in lossy compression typically results in better quality.

Answer 12

True

Question 13

What is the main disadvantage of lossy compression?

Answer 13

Loss of data quality and detail.

Question 14

Name a common application of lossless compression.

Answer 14

File archiving with formats like ZIP.

Question 15

Multiple Choice: Which of the following formats is NOT typically lossy? A) MP3 B) WAV C) JPEG

Answer 15

B) WAV

Question 16

What is a common use case for lossless audio compression?

Answer 16

Archiving music without quality loss.

Question 17

Fill in the blank: Lossy compression techniques can include ________ and ________.

Answer 17

psychoacoustic models; quantization

Question 18

True or False: All compression methods reduce file size.

Answer 18

True

Question 19

What is the primary goal of compression?

Answer 19

To reduce the amount of data required to represent information.

Question 20

Multiple Choice: Which of the following is a lossless compression algorithm? A) LZW B) MP3 C) AAC

Answer 20

A) LZW

Question 21

What is the key difference between lossy and lossless compression?

Answer 21

Lossy compression removes some data, while lossless compression retains all original data.

Question 22

Fill in the blank: A common method to achieve lossy compression in images is ________.

Answer 22

discrete cosine transform (DCT)

Question 23

True or False: Lossless compression is always more efficient than lossy compression.

Answer 23

False

Question 24

What is one potential downside of using lossy compression on audio files?

Answer 24

Reduced sound quality.

Question 25

What type of compression is most suitable for archival storage?

Answer 25

Lossless compression