Question

Which of the following statements is/are correct?

i. The OS manages all the resources of a computer.

ii. The OS provides an interface to the user.

iii. The program execution order is decided by the OS when multiple application programs need to be run.

• A. Only ii
• B. Only i and ii
• C. Only ii and iii
• D. All of the above (i, ii and iii)

Answer 1

Answer:

D. All of the above (i, ii and iii)

All three statements correctly describe fundamental functions of an Operating System (OS):

• i. The OS manages all the resources of a computer.

  • Correct. This is a primary role of the OS. Resources include the CPU (processor time), memory (RAM), I/O devices (disk drives, printers), and files. The OS allocates and protects these resources.

• ii. The OS provides an interface to the user.

  • Correct. The OS allows users to interact with the computer. This interface can be a Graphical User Interface (GUI) (like Windows or macOS) or a Command Line Interface (CLI) (like Linux shell).

• iii. The program execution order is decided by the OS when multiple application programs need to be run.

  • Correct. This function is known as process scheduling. When you run multiple applications simultaneously (multitasking), the OS uses scheduling algorithms to determine which program gets access to the CPU and for how long, managing the execution order to ensure fair and efficient use of the processor.