UGC NET Questions (Paper – 1)

Statements A, B, D and E describe core OS functions and a specific OS type. Operating systems allocate CPU and memory, offer file management and provide authentication and access control. A single-user, single-task OS indeed restricts execution to one program at a time. Statement C is false because OSs coordinate I/O devices, and F is false since many graphical systems expose command-line interfaces. Thus A, B, D and E only are correct.

Option A:
Option A is incorrect because it omits E, ignoring the description of single-user, single-task operating systems. While A, B and D are true, this combination fails to include all correct statements given in the question.

Option B:
Option B is correct because it gathers process and memory management, file services, security mechanisms and a valid classification of an OS. It excludes C and F, which misrepresent the OS role in I/O and the possibility of command-line interfaces.

Option C:
Option C is incorrect because it leaves out B and does not mention file management as a key OS responsibility. Although A, D and E are true, omitting B makes the set incomplete.

Option D:
Option D is incorrect because it includes F, which wrongly claims that graphical systems cannot have command-line tools. Mixing true statements with this incorrect claim means the entire option cannot be accepted.