MCQ IN COMPUTER SCIENCE & ENGINEERING

Detailed explanation-1: -Compression reduces the size of a file, often without appreciable loss of information. It can be either lossless or lossy. A smaller-sized compressed file can be restored to its larger form–in its entirety or with some data loss, depending on the compression type–by decompression.

Detailed explanation-2: -Compression methods like ZIP and RAR scan a file from top to bottom in order to recognize similar or repetitive patterns. Duplicates are replaced with a unique identifier much smaller than the original word, so the overall size of the file is reduced.

Detailed explanation-3: -Data compression is a reduction in the number of bits needed to represent data. Compressing data can save storage capacity, speed up file transfer and decrease costs for storage hardware and network bandwidth.

Detailed explanation-4: -Data compression is the process of encoding, restructuring or otherwise modifying data in order to reduce its size. Fundamentally, it involves re-encoding information using fewer bits than the original representation.

Detailed explanation-5: -Lossy compression reduces an image file size by permanently removing less critical information, particularly redundant data. Lossy compression can significantly reduce file size, but it can also reduce image quality to the point of distortion, especially if the image is overly compressed.