O-LevelComputer ScienceBoolean logic2210/12 · May/June 2016 · Q713 Marks
Complete the truth table for this logic circuit. [Diagram of logic circuit]
- (a)Complete the truth table for this logic circuit. [Diagram of logic circuit][4]
- (b)Draw a logic circuit corresponding to the following logic statement: X = 1 if ((A is 1 OR B is 1 ) AND ( A is 1 AND B is 1 ) ) OR (C is NOT 1)[5]
- (c)Re-draw the following logic circuit using NAND gates only. [Diagram of logic circuit] Logic circuit re-drawn:[4]
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Mark scheme
Marking points from the official mark scheme (May/June 2016). The mark or mark type is shown in brackets.
- [4] 7 (a) 4 marks for 8 correct X bits 3 marks for 6 correct X bits 2 marks for 4 correct X bits 1 mark for 2 correct X bits A B C X 0 0 0 0 0 0 1 1 0 1 0 0 0 1 1 1 1 0 0 0 1 0 1 1 1 1 0 1 1 1 1 0
- [5] (b) 1 mark for each correct gate with correct source of input [Diagram of logic circuit]
- [4] (c) Each dotted area is 1 mark [Diagram of logic circuit using NAND gates]
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