Worksheet library · A Level

A Level Computer Science Exam Questions by Topic

Practise A Level Computer Science one topic at a time with original OCR H446, AQA, WJEC and Eduqas-style questions. The 19 topic sets below contain 267 printable pages, with the mark scheme beside the questions so you can check the method before moving on.

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Component 1: Computer Systems (10)Component 2: Algorithms and Programming (9)

How to practise exam questions by topic

Choose the topic that cost marks in classwork or a past paper. Try the questions without notes so the first attempt shows what the student can actually recall.
Use the mark scheme to compare the method as well as the final answer. For written subjects, check that each credited point is stated clearly; for calculations, identify the first step that went wrong.
Revisit the same topic after a gap, then mix it into a full paper. Topic practice repairs one weakness at a time, while a timed paper checks whether the method can still be recognised among other questions.

See the method: Structure and Function of the Processor

A processor has a clock speed of 2.5 GHz, and each instruction takes an average of 5 clock cycles to complete. Calculate the number of instructions the processor can execute in one second.

Convert the clock speed to hertz: 2.5 GHz = 2.5 x 10^9 cycles per second.
Divide the cycles per second by the number of cycles needed per instruction: 2.5 x 10^9 / 5.
Calculate the result: 2.5 x 10^9 / 5 = 5 x 10^8.
Final answer: the processor can execute 5 x 10^8 (500 million) instructions per second.

1.1 Structure and Function of the Processor5p + answers · 90 marks · PDF

1.2 Types of Software and Development Methodologies4p + answers · 129 marks · PDF

1.3 Exchanging Data: Databases, Networks and Web Technologies5p + answers · 117 marks · PDF

1.4 Data Types, Data Structures and Boolean Algebra8p + answers · 138 marks · PDF

1.5 Legal, Moral, Cultural and Ethical Issues5p + answers · 112 marks · PDF

1.6 Computer Architecture, Assembly and the LMC5p + answers · 93 marks · PDF

1.7 Boolean Algebra, Logic Gates and Karnaugh Maps7p + answers · 85 marks · PDF

1.8 Databases, SQL and Normalisation6p + answers · 104 marks · PDF

2.7 Object-Oriented Programming7p + answers · 127 marks · PDF

2.8 Recursion and Advanced Algorithms8p + answers · 107 marks · PDF

2.1 Elements of Computational Thinking10p + answers · 133 marks · PDF

2.2 Problem Solving and Programming10p + answers · 144 marks · PDF