A-LevelComputer ScienceHardware9618/12 · May/June 2023 · Q64 Marks

Draw the logic circuit for this logic expression: Z = (R XOR S) AND (NOT T NOR P)

(a)Draw the logic circuit for this logic expression: Z = (R XOR S) AND (NOT T NOR P)[2]
(b)Complete the truth table for this logic expression: Z = (NOT P OR Q) XOR (R NOR Q) P Q R Working space Z 0 0 0 0 0 1 0 1 0 0 1 1 1 0 0 1 0 1 1 1 0 1 1 1[2]

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Mark scheme

Marking points from the official mark scheme (May/June 2023). The mark or mark type is shown in brackets.

[2] 1 mark for correct XOR and AND gates, with correct inputs 1 mark for correct NOT and NOR gates with correct inputs [Diagram showing the logic circuit]
[2] 1 mark for first 4 rows 1 mark for last 4 rows P | Q | R | Working space | Z 0 | 0 | 0 | | 0 0 | 0 | 1 | | 1 0 | 1 | 0 | | 1 0 | 1 | 1 | | 1 1 | 0 | 0 | | 1 1 | 0 | 1 | | 0 1 | 1 | 0 | | 1 1 | 1 | 1 | | 1

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About this question

Topic

Hardware, A-Level Computer Science (syllabus 9618). Structured question, 4 marks.

Source

A-Level Computer Science, May/June 2023 Paper 1 Variant 2, question 6.

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