A 1.3.4 Worksheet Answers
Task 1. 1–C, 2–E, 3–A (a device that rarely needs attention favours interrupts over constant checking), 4–B, 5–D. Note: the matches are the situations where each consideration is decisive. Accept a reasoned alternative for item 3 if the student argues event frequency from the "rare event" angle. Task 2. a) Smoke alarm: interrupts. The event is rare and unpredictable but must be responded to instantly, so polling...