The average sizes of some pathogens are shown. [Figure 39.1] One type of air filter has been shown to be effective at preventing any pathogens of 1 µm or larger from entering the air system of a room. Based on their size and mode of transmission, which diseases would the air filter prevent from entering the air system of a room?
✓ Correct Answer
The correct answer is D: HIV infection (not prevented), TB (prevented), malaria (not prevented), cholera (not prevented)
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
🎯 Mark Scheme Breakdown
Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.
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