A-LevelComputer ScienceDigital LogicOct/Nov 2024Paper 1 Q14 Marks
Complete the truth table for the logic expression: X = (A XOR B) NAND (A AND (B XOR C)) [Figure 1.1: Truth table with columns A, B, C, Working space, X, and rows of binary values for A, B, C.] Draw the logic circuit for the logic expression: W = P NAND ((Q OR NOT R) XOR (P XOR Q)) [Figure 1.2: Empty space for drawing a logic circuit.]
📋 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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