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Thermal Physics
Practice Questions

10 CIE IGCSE Physics questions on Thermal Physics, each with instant feedback and a full examiner-style mark scheme.

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Try 2 sample questions on Thermal Physics

Question 1 · 1 mark · Difficulty 1/3

A fixed mass of gas is heated at constant pressure. Which row correctly describes the changes to the volume and the average speed of the molecules?

  1. A. Volume increases; average speed increases
  2. B. Volume increases; average speed decreases
  3. C. Volume decreases; average speed increases
  4. D. Volume decreases; average speed decreases
Show answer & explanation
✓ Answer: A — A. Volume increases; average speed increases
At constant pressure, heating a gas increases its temperature. By Charles's Law, volume is proportional to absolute temperature so volume increases. Since temperature is proportional to mean square speed, the average speed of molecules also increases.
Question 2 · 1 mark · Difficulty 1/3

Which of the following best describes the internal energy of an ideal gas?

  1. A. The sum of the kinetic energies of all the molecules only
  2. B. The sum of the potential energies of all the molecules only
  3. C. The sum of the kinetic and potential energies of all the molecules
  4. D. The average kinetic energy of a single molecule
Show answer & explanation
✓ Answer: A — A. The sum of the kinetic energies of all the molecules only
For an ideal gas, intermolecular forces are assumed to be negligible, so molecules have no potential energy due to intermolecular interactions. Therefore, the internal energy consists solely of the sum of the random kinetic energies of all the molecules.
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CIE IGCSE Physics: Thermal Physics FAQ

How many CIE IGCSE Physics questions on Thermal Physics are there on Kramizo?
Kramizo currently has 10 exam-board-aligned practice questions on Thermal Physics for CIE IGCSE Physics, 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 Physics?
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 Thermal Physics practice with other Physics 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 Thermal Physics questions aligned to the official CIE IGCSE Physics syllabus?
Every question is written against the published CIE IGCSE Physics 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 Thermal Physics typically tested on CIE IGCSE Physics papers?
Thermal Physics appears across multiple question types on real CIE IGCSE Physics 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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