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O-LevelComputer ScienceBoolean logic2210/11 · May/June 2017 · Q104 Marks

Complete the truth table for the NOR gate. A B Output (X) 0 0 0 1 1 0 1 1

  1. (a)Complete the truth table for the NOR gate. A B Output (X) 0 0 0 1 1 0 1 1[1]
  2. (b)Write a logic statement that corresponds with the following logic circuit. [Figure depicting logic circuit with inputs A, B, C and output X] X =[3]

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Mark scheme

Marking points from the official mark scheme (May/June 2017). The mark or mark type is shown in brackets.

  1. [1] 1 mark for four correct outputs only A B Output 0 0 1 0 1 0 1 0 0 1 1 0
  2. [3] 1 mark for each correct section of the statement ∞ (A AND B) ∞ AND ∞ (C OR NOT B)

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About this question

Topic
Boolean logic, O-Level Computer Science (syllabus 2210). Structured question, 4 marks.
Source
O-Level Computer Science, May/June 2017 Paper 1 Variant 1, question 10.

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