Operating system functions – UGC NET Question

Statements A, B and D accurately describe key responsibilities of an operating system, whereas C is false. The operating system allocates and coordinates hardware resources, provides user interfaces and manages files in storage. These functions are present on desktops, laptops and mobile devices alike. Statement C wrongly restricts operating systems to mobiles, ignoring widely used desktop and server operating systems. Thus, the correct set is A, B and D only.

Option A:
Option A is correct because it collects all the true statements regarding OS roles and correctly excludes C. It shows that operating systems are central to controlling hardware, providing interaction and organising files across different computing platforms.

Option B:
Option B is incorrect because it lists A and D only, leaving out B. While resource and file management are crucial, the user interface is also a primary function of modern operating systems and should not be omitted.

Option C:
Option C is incorrect because it treats B, C and D as correct, thereby accepting C. Since C contradicts the existence of desktop OS like Windows, Linux and macOS, this option cannot be considered accurate.

Option D:
Option D is incorrect because it assumes all four statements are correct and so accepts C. Including a clearly false claim about where operating systems are used invalidates the entire combination.