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CAPE Information Technology Unit 1 study materials
CAPE Information Technology Unit 1 study resources

CAPE Information Technology Unit 1: Unit 1 Module 1 - Information Technology Theory

CAPE Information Technology Unit 1 · Work through your exam, one topic at a time.

All guide sections

Unit 1 Module 1 - Information Technology Theory

This module tests the conceptual foundation of computing: how data becomes information, how a computer system is organised, how data is represented internally, and how devices communicate. Expect definitions, comparisons, number-system conversions and short explanations of why a component or topology is suitable.

Core distinctions and components

  • Data is raw symbols; information is data processed into meaning; knowledge applies information. A computer system takes input, processes it, produces output and stores results.
  • Hardware is physical; software is instructions. System software (operating system, utilities) manages the machine; application software performs user tasks.
  • The CPU contains the arithmetic logic unit, control unit and registers. RAM is volatile working memory; ROM is non-volatile and holds firmware such as the bootstrap loader. Secondary storage is non-volatile but slower.
  • A bit is one binary digit; a nibble is 4 bits; a byte is 8 bits. In this context 1 KiB = 1024 bytes, 1 MiB = 1024 KiB.
  • ASCII uses 7 bits for 128 characters (8-bit extensions add more); Unicode covers far larger character sets.
  • LAN covers a small area; WAN spans larger distances. Star, bus and ring are common topologies; guided media include twisted pair and fibre, unguided include radio and microwave.

Worked example

Convert binary 11010110 to denary and hexadecimal, showing place values. Denary: 128 + 64 + 16 + 4 + 2 = 214. Hex: split into nibbles 1101 and 0110; 1101 = D (13), 0110 = 6, so the result is D6. The reasoning matters: each hex digit maps to exactly four bits, so grouping from the right avoids conversion errors.

Traps that cost marks

  • Treating 1 KB as 1000 bytes when the question expects 1024.
  • Saying RAM is “permanent” or ROM is “the same as RAM”; state volatility and typical use.
  • Confusing bits with bytes in storage calculations.
  • Forgetting that hex uses A–F for 10–15.
  • Describing a star topology without noting that the central device is a single point of failure.
  • Giving a definition without the comparison the question asks for, such as data versus information.