AS & A Level Computer Science (9618) — October–November 2023, Paper 33

12 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.

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Question 1 · 5 marks · Floating-point numbers, representation and manipulation

Write the normalised floating-point representation of +65.25 in this system. Show your working. Complete the Mantissa (12-bit) and Exponent (4-bit) bit boxes.

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Question 2 · 6 marks · Communication and internet technologies - protocols

Draw one line to connect each protocol to its most appropriate use.

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Question 3 · 4 marks · User-defined data types - non-composite (enumerated, pointer)

Describe what is meant by enumerated and pointer data types.

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Question 4 · 6 marks · File processing - file organisation and access

Describe sequential and random methods of file organisation.

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Question 5 · 4 marks · Processor architecture - Flynn's classification (SISD, MIMD)

Describe the features of SISD and MIMD computer architectures.

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Question 6 · 6 marks · Boolean algebra and logic circuits - truth tables

This diagram represents a logic circuit. Complete the truth table for the given logic circuit.

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Question 7 · 5 marks · System software - purposes of an operating system (user interface)

A student buys a new computer. State one benefit to the student of a user interface and give an example.

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Question 8 · 8 marks · File processing and exception handling - random file handling

Complete the file handling pseudocode. DECLARE Customer : TAccount DECLARE Location : INTEGER DECLARE AccountFile : STRING ................................................ ←…

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Question 9 · 9 marks · Data structures - Reverse Polish Notation

Write the infix expression for this Reverse Polish Notation (RPN) expression: 5 2 – 5 4 + 9 /

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Question 10 · 10 marks · Abstract data types (ADTs) - stack implementation

Write the pseudocode for the required declarations.

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Question 11 · 8 marks · Declarative (logic) programming

Anthony is a student who would like to study history and geography. Write additional clauses to represent this information. 22 ................................................ 23…

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Question 12 · 4 marks · Artificial intelligence (AI) - artificial neural networks

Artificial neural networks have played a significant role in the development of machine learning. Explain what is meant by the term artificial neural network.

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