A Level Computer Science OCR Practice Exam

What does an interrupt signal indicate in computer systems?

1. A completion of a task

2. A need for the OS to prioritize and address an issue

3. A request for additional memory

4. A warning of overheating hardware

The correct answer is: A need for the OS to prioritize and address an issue

An interrupt signal serves a critical role in managing how a computer's processor interacts with different tasks and hardware components. When an interrupt signal is received, it indicates that there is an event or condition that requires immediate attention from the operating system. This allows the OS to prioritize and address the issue, ensuring that time-sensitive processes are managed effectively. For instance, an interrupt could signal that an I/O device, like a keyboard or mouse, requires processing (for example, a key press event). By handling these interrupts promptly, the system can maintain a responsive user interface and effectively manage resources. This mechanism enhances multitasking capabilities and overall system efficiency, as it allows the processor to pause its current tasks and respond to higher-priority needs when they arise. The other options do not encapsulate the primary function of interrupt signals in the system. Completion of a task generally does not warrant an interrupt signal; rather, it may update the state of a process. A request for additional memory is typically managed through memory management mechanisms rather than via interrupts. Lastly, while overheating hardware is a serious concern, it would typically trigger a hardware failure response instead of a simple interrupt signal, as preventive actions would already be in place to manage thermal conditions.