Multimedia Quiz 3rd May

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| By Ishrat Hayat

Ishrat Hayat

Community Contributor

Quizzes Created: 2 | Total Attempts: 853

Questions: 10 | Attempts: 100 | Updated: Mar 20, 2023

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Questions and Answers

1.

If fps value is set high, it means speedy motion, why high value make speedy scientifically.
2.

If we set a very high compression rate value say 90%, what is disadvantage and why?
3.

The output values for the current string column only , of a given data abacaa using LZW are:_
4.

List the advantages of lossless compression and lossyy compression along name of techniques used and give any numerical using loss and compression rate to indicate performance of the respective codecs
5.

Lzw compression replaces string to code, with output code length is
- A.
  
  Equal to string itself
- B.
  
  Lesser than the string
- C.
  
  Greater than the string
Correct Answer
B. Lesser than the string

Explanation
LZW compression replaces a string with a code, which represents that string. The purpose of compression is to reduce the size of the data. In the case of LZW compression, the output code length is typically lesser than the original string length. This is because the compression algorithm replaces repetitive patterns with shorter codes, resulting in a more efficient representation of the data. Therefore, the output code length is expected to be lesser than the original string length.

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6.

Lossless compression is less used for which media type
- A.
  
  Sound
- B.
  
  Image
- C.
  
  Text
- D.
  
  Video
Correct Answer
D. Video

Explanation
Lossless compression is a method of reducing the size of files without losing any data. It is commonly used for media types such as images, sound, and text where preserving the original quality is important. However, lossless compression is less used for video files. This is because video files are typically large and require significant compression to reduce their size, which can result in a loss of quality. Therefore, lossy compression methods are often preferred for video files, as they allow for greater compression ratios while sacrificing some quality.

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7.

If compression rate of a codec A value is 5 in comprison to other codec B value of 2.5, A is most probably
- A.
  
  Lossless codecs
- B.
  
  Lossy codec
- C.
  
  None
- D.
  
  All false
Correct Answer
B. Lossy codec

Explanation
The given information states that the compression rate of codec A is 5 compared to codec B's compression rate of 2.5. This means that codec A is able to achieve a higher level of compression, indicating that it is most probably a lossy codec. Lossy codecs are known for achieving higher compression rates by discarding some data during the compression process, resulting in a loss of quality. Therefore, the answer "lossy codec" is correct in this context.

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8.

Algorithm with a file into smaller file using a table based lookup is ________

Correct Answer
LZW

Explanation
The correct answer is LZW. The LZW algorithm is a widely used compression algorithm that works by replacing repeated sequences of data with shorter codes. It uses a table-based lookup approach, where a dictionary is built and updated as the algorithm reads the input file. This dictionary allows the algorithm to efficiently encode and decode the data by referencing the codes for repeated sequences. Therefore, LZW fits the given description of an algorithm that divides a file into smaller files using a table-based lookup.

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4
9.

Commonly file format used in your daily compression for Unix operating system
- A.
  
  Zip
- B.
  
  Gzip
- C.
  
  Tiff
- D.
  
  Pdf
Correct Answer
B. Gzip

Explanation
Gzip is commonly used for file compression in Unix operating systems. It is a popular and widely supported file format that provides efficient compression and decompression of files. Gzip is often used to reduce the size of files, making them easier to store, transfer, and download. It is a command-line tool that is frequently used in Unix-based systems for compressing and decompressing files and directories.

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Multimedia Quiz 3rd May

If fps value is set high, it means speedy motion, why high value make speedy scientifically.

If we set a very high compression rate value say 90%, what is disadvantage and why?

The output values for the current string column only , of a given data abacaa using LZW are:_

List the advantages of lossless compression and lossyy compression along name of techniques used and give any numerical using loss and compression rate to indicate performance of the respective codecs

Lzw compression replaces string to code, with output code length is

Lossless compression is less used for which media type

If compression rate of a codec A value is 5 in comprison to other codec B value of 2.5, A is most probably

Algorithm with a file into smaller file using a table based lookup is ________

Commonly file format used in your daily compression for Unix operating system