Data Representation
Binary, denary, hexadecimal, character sets, images, sound and data compression.
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Explore Computer Science
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Processor and Architecture
CPU components, registers, buses, the fetch-decode-execute cycle and performance.
Memory and Storage
RAM, ROM, cache, virtual memory and secondary storage technologies.
Programming Fundamentals
Variables, data types, operators, selection, iteration and modular programming.
Algorithms and Pseudocode
Design solutions with clear steps, trace tables, flowcharts and pseudocode.
Searching and Sorting
Explore linear search, binary search, bubble sort and algorithm efficiency.
Databases and SQL
Tables, records, fields, primary keys, relationships and introductory SQL queries.
Stacks, Queues and Trees
Understand common abstract data types, operations and typical use cases.
Computer Networks
LANs, WANs, network topologies, protocols, IP addresses and packet switching.
Cybersecurity
Threats, malware, phishing, encryption, authentication and security measures.
Software Engineering
Analysis, design, implementation, testing, maintenance and development approaches.
Operating Systems
Process management, memory management, file systems and device management.
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Learn by doing
Programming quick start
A simple example of sequence, selection and iteration — three fundamental programming constructs.
Example: Find the largest number
DECLARE a : INTEGER
DECLARE b : INTEGER
OUTPUT "Enter two numbers"
INPUT a
INPUT b
IF a > b THEN
OUTPUT a
ELSE
OUTPUT b
ENDIF
This pseudocode inputs two numbers, compares them and outputs the larger one. If they are equal, the example outputs the second number, which is also the same value.
Three core constructs
- Sequence: instructions execute in order.
- Selection: a condition determines which path runs.
- Iteration: instructions repeat while a loop condition or count requires it.
Exam tip: trace the algorithm line by line. Update variable values carefully and record each output in order.
Test your understanding
Computer Science MCQ Lab
Try these introductory questions and read the explanations after every answer. They are practice questions, not official Pearson examination questions.
QUESTION 1 OF 12