File compression

A programmer wants to send a large program as an email attachment and wants compress it. Which of the following is correct.

• The file must be not be compressed because any form of compression will cause the program to become corrupted.

• The file must be compressed using lossy compression or the program will become corrupted.

• The file must be compressed using lossless compression or the program will become corrupted.

• It does not matter if the fille is compressed using lossy or lossless compression.

Which of the following statements is true about JPEG image files.

• This file type file can be compressed using lossy compression because some loss of image quality is acceptable when the image is uncompressed.

• This file type file can be compressed using lossless compression because some loss of image quality is acceptable when the image is uncompressed.

• This file type file must be compressed using lossy compression or the image will become corrupted.

• This file type file must be compressed using lossless compression or the image will become corrupted.

Which of the following statements is true about two JPEG image files compressed to 90% of the original (the colour depth, dimensions, resolution etc. are identical)

• An image of tree foliage will be a smaller file size than an image of a cloudless sky.

• There is no connection between what the image is of and the size of the compressed image.

• An image of tree foliage will be the same file size as an image of a cloudless sky.

• An image of tree foliage will be a larger file size than an image of a cloudless sky.

What is a definition of file compression?

• File compression is the process of encoding information using the same number of bits but a smaller file size.

• File compression is the process of encoding information using a smaller number of bits but keeping the file size the same.

• File compression is the process of encoding information using fewer bits so that the compressed file size is smaller.

Which of the following statements is true about MP3 compressed files.

• An audio file format commonly used to store music and voice data. MP3 files use lossy compression so the original quality is not fully preserved.

• An audio file format commonly used to store music and voice data. MP3 files use lossless compression so the original quality is fully preserved..

• An image file format commonly used to bitmap image data. MP3 files use lossy compression so the original quality is not fully preserved.

• An audio file format commonly used to store music and voice data. MP3 files use lossy compression so the original quality is fully preserved.

Which of the following statements is true about MPEG compressed files.

• This file format is commonly used to store video data. MPEG files use lossy compression and the audio/video compression levels can be set to allow a balance between file size (and therefore download time) and sound/image quality.

• This file format is commonly used to store video data. MPEG files use lossless compression and the audio/video compression levels can be set to allow a balance between file size (and therefore download time) and sound/image quality.

• This file format is commonly used to store audio data. MPEG files use lossy compression and the audio/video compression levels can be set to allow a balance between file size (and therefore download time) and sound/image quality.

Text files can can be compressed by:

• replacing repeated words with codes which use less memory units

• replacing currency data with integer numbers

• using ASCII format

• collecting repeated words into a data dictionary

The file compression algorithm of MP3 uses:

• perceptual music shaping

• lossless compression

• a bit rate roughly between 80 and 320 kilobits per second

• a velocity byte to indicate how loud to play the note

The .mid extension indicates:

• a protocol that uses a 8-bit asynchronous serial transmission.

• a file containing music, like MP3 or MP4.

• a file with a start bit, a status byte, a pitch byte, a stop bit.

• a big size file, due to the 16 MIDI channels which can operates on

Multimedia files (videos, photos, sounds, animations) can be stored as:

• MPEG-3

• MPEG-4

• TIF

• GIF