UGC NET Questions (Paper – 1)

Statements A, B, C, E and F together describe the main ideas behind compression and its trade-offs, while D is too absolute. Compression does reduce file size, lossless methods preserve every bit and lossy methods discard some information, often in ways that exploit human perception. Format choice depends on content and intended use, and excessive lossy compression can visibly or audibly degrade quality. The claim in D that compressed files always open faster ignores hardware, software and decompression overhead, so it must be excluded.

Option A:
Option A is incorrect because it omits F, which notes that very high lossy compression ratios can harm quality. Although A, B, C and E are true, leaving out F fails to capture an important consequence of aggressive lossy compression. The combination therefore does not contain all the correct statements.

Option B:
Option B is correct because it includes all five true statements A, B, C, E and F and excludes D. It recognises the roles of lossless and lossy methods, the importance of use-case-based format choice and the potential quality loss at extreme compression levels. By not accepting D, it avoids overstating performance benefits of compression.

Option C:
Option C is incorrect because it leaves out B, which defines lossless compression as allowing exact reconstruction. Without B, the set misses a key distinction between types of compression. An answer that omits such a central concept cannot be complete.

Option D:
Option D is incorrect because it omits A, which introduces the general idea that compression reduces file size by more efficient encoding. While B, C, E and F are true, excluding A removes the fundamental starting point for the topic. Therefore this combination is not the correct one.