A-LevelBiologyCell structureOct/Nov 2022Paper 1 Q11 Mark
The diagram shows a stage micrometer, with divisions 0.10mm apart, viewed through an eyepiece containing a graticule. [Diagram] The area of the field of view of the microscope can be calculated using this formula. area = πr² A student calculated the area of the field of view of the microscope using the information provided and a value for π of 3.142. Which answer has been rounded correctly to an appropriate number of significant figures?
A0.04909 mm²
B5 × 10-² mm²
C4.909 × 104 µm²
D4.91 × 104 µm²
✓ Correct Answer
The correct answer is D: 4.91 × 104 µm²
📋 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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