A-LevelComputer ScienceAbstract Data TypesMay/June 2025Paper 2 Q211 Marks
A programmer uses a number of Abstract Data Types (ADT) in the programs that she is developing. (a) A stack using memory locations 400 to 409 is used in one program. The diagram represents the current state of the stack. A variable TopOfStack pointer indicates the last value added to the stack. [Figure showing a stack with memory locations 400-409, values 'B', 'D', 'X', 'P' at 400-403, and TopOfStack pointing to 403 ('P')].
📋 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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