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Hardware: central processing unit (CPU) architecture, components and their functions (ALU, CU, registers, buses, cache)
Practice Questions

20 CIE IGCSE Computer Science questions on Hardware: central processing unit (CPU) architecture, components and their functions (ALU, CU, registers, buses, cache), each with instant feedback and a full examiner-style mark scheme.

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Try 2 sample questions on Hardware: central processing unit (CPU) architecture, components and their functions (ALU, CU, registers, buses, cache)

Question 1 · 1 mark · Difficulty 1/3

Which component of the CPU is responsible for performing arithmetic and logical operations on data?

  1. Control Unit (CU)
  2. Program Counter (PC)
  3. Memory Address Register (MAR)
  4. Arithmetic Logic Unit (ALU)
Show answer & explanation
✓ Answer: D — Arithmetic Logic Unit (ALU)
The ALU performs all arithmetic operations (such as addition and subtraction) and logical operations (such as AND, OR, NOT) on data. The Control Unit directs the operation of the processor but does not perform calculations. The Program Counter holds the address of the next instruction, and the MAR holds the address of the memory location being accessed.
Question 2 · 1 mark · Difficulty 1/3

Which register holds the memory address of the data or instruction that the CPU currently needs to read from or write to in main memory?

  1. Memory Data Register (MDR)
  2. Current Instruction Register (CIR)
  3. Memory Address Register (MAR)
  4. Accumulator (ACC)
Show answer & explanation
✓ Answer: C — Memory Address Register (MAR)
The Memory Address Register (MAR) holds the address of the memory location that the CPU wants to access. The CIR holds the instruction currently being decoded/executed. The ACC holds the result of the most recent ALU operation. The MDR holds the actual data that has been read from or is about to be written to memory.
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CIE IGCSE Computer Science: Hardware: central processing unit (CPU) architecture, components and their functions (ALU, CU, registers, buses, cache) FAQ

How many CIE IGCSE Computer Science questions on Hardware: central processing unit (CPU) architecture, components and their functions (ALU, CU, registers, buses, cache) are there on Kramizo?
Kramizo currently has 20 exam-board-aligned practice questions on Hardware: central processing unit (CPU) architecture, components and their functions (ALU, CU, registers, buses, cache) for CIE IGCSE Computer Science, with new questions added every week. Each question gives you instant feedback and a full examiner-style mark scheme that tells you exactly what would earn marks on a real CIE paper. The questions span the full difficulty range — from straightforward recall (level 1) right up to multi-step reasoning and evaluation (level 3) — so the bank works for first-pass revision and final exam-week stress testing alike.
Is Kramizo free for CIE IGCSE students preparing for Computer Science?
Yes — completely free. Every student gets 45 questions a day on the free plan, with no card required and no trial countdown. That free quota works across every subject and every topic in our bank, so you can mix Hardware: central processing unit (CPU) architecture, components and their functions (ALU, CU, registers, buses, cache) practice with other Computer Science topics or even switch to a totally different CIE subject without paying anything. Kramizo's optional Pro plan removes the daily cap and adds detailed progress analytics, but the free tier is the real product — used by thousands of GCSE, IGCSE and CSEC students.
Are the Hardware: central processing unit (CPU) architecture, components and their functions (ALU, CU, registers, buses, cache) questions aligned to the official CIE IGCSE Computer Science syllabus?
Every question is written against the published CIE IGCSE Computer Science specification, including the exact command words (state, describe, explain, calculate, evaluate, etc.), mark allocations, and difficulty tier you'd see on a real CIE paper. Explanations are written in the style of official examiner mark schemes — they tell you what is being awarded marks and why distractors are wrong, not just whether you got it right. The bank is continually refined to match the latest syllabus updates from CIE.
How is Hardware: central processing unit (CPU) architecture, components and their functions (ALU, CU, registers, buses, cache) typically tested on CIE IGCSE Computer Science papers?
Hardware: central processing unit (CPU) architecture, components and their functions (ALU, CU, registers, buses, cache) appears across multiple question types on real CIE IGCSE Computer Science papers — most commonly as multiple-choice questions in the objective section, structured short-answer questions in the main paper, and occasionally as part of an extended response. Kramizo's practice bank reflects that mix: 4-option MCQs, true/false statements, fill-in-the-blank key terms, multi-select questions, and ordering questions. Working through the bank gives you exposure to every question style examiners actually use.

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