SLR 4 - Interrupts

What is the standard operation of an OS in terms of processing time?

• To allocate all processing time to one process

• To divide processing time between the processes that are running

• To prioritize only the most important tasks

• To run processes sequentially without interruption

Which factor is NOT considered when dividing processing time between tasks?

• The type of hardware used

• The importance of the task

• When the task was requested

• The length of the task

Why is the standard method of allocation unsuitable for certain processes?

• Because it requires manual intervention

• Because it only works for hardware tasks

• Because it does not allow processes to run immediately when needed

• Because it allocates too much time to each process

What is an interrupt in the context of an operating system?

• A way to permanently stop a process

• A method to allocate more processing time to a task

• A type of hardware failure

• A signal that requests immediate attention from the processor

Which of the following is NOT a reason for a processor to be interrupted?

• The processor has completed all tasks

• A software process needs a service to be provided

• A hardware failure has occurred

• A hardware device has signaled that it has data to process

What is an ISR?

• A type of hardware device

• A mini program designed to respond to an interrupt’s request

• A type of software process

• A method to allocate processing time

What happens when a key is pressed on the keyboard?

• The processor stops all other tasks

• The ISR polls the keyboard and stores the character in the keyboard buffer

• The keyboard sends a signal to the monitor

• The OS ignores the key press

What does the processor do if there are no interrupts?

• It waits for user input

• It repeats the fetch-decode-execute cycle

• It shuts down

• It runs a diagnostic check

What is the first step when an interrupt is received?

• The processor identifies the origin of the interrupt

• The processor completes the current fetch-decode-execute cycle

• The processor immediately runs the ISR

• The processor saves the current contents of the registers

What happens to lower-priority interrupts when an ISR is running?

• They are processed immediately

• They are put on hold

• They are ignored

• They are deleted