O-LevelComputer ScienceData Representation2210/12 · Oct/Nov 2017 · Q15 Marks

A robot arm in a factory is programmed to move products. The binary instructions to operate the robot arm are: Operation Binary Instruction UP 1 1 1 1 DOWN 0 0 0 1 LEFT 1 0 0 1 RIGHT 0 1 1 0 OPEN 1 1 0 0 CLOSE 0 0 1 1 The instructions are entered as hexadecimal values. An operator enters the values: 9 1 C 3 F Convert the values and write down the operation (e.g. RIGHT) carried out by the robot arm.

Convert the values and write down the operation (e.g. RIGHT) carried out by the robot arm. 9 1 C 3 F[5]

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Mark scheme

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

[5] 1 mark per correct instruction: 9 – LEFT; 1 – DOWN; C – OPEN; 3 – CLOSE; F – UP

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Topic: Data Representation, O-Level Computer Science (syllabus 2210). Structured question, 5 marks.
Source: O-Level Computer Science, Oct/Nov 2017 Paper 1 Variant 2, question 1.

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