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CIE · IGCSE · Physics

Radiation of thermal energy
Practice Questions

20 CIE IGCSE Physics questions on Radiation of thermal energy, each with instant feedback and a full examiner-style mark scheme.

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Try 2 sample questions on Radiation of thermal energy

Question 1 · 1 mark · Difficulty 1/3

Which of the following correctly describes thermal radiation?

  1. Energy transfer that requires a medium of particles
  2. Energy transfer by electromagnetic waves that can travel through a vacuum
  3. Energy transfer by the movement of heated particles in a fluid
  4. Energy transfer through direct contact between particles
Show answer & explanation
✓ Answer: BEnergy transfer by electromagnetic waves that can travel through a vacuum
Award 1 mark for identifying that thermal radiation is energy transfer by electromagnetic waves that can travel through a vacuum. A is incorrect — this describes conduction or convection, which require particles. C is incorrect — this describes convection. D is incorrect — this describes conduction.
Question 2 · 1 mark · Difficulty 1/3

The Earth receives thermal radiation from the Sun. The average distance from the Sun to the Earth is 1.5 × 10⁸ km. How does this thermal radiation travel from the Sun to the Earth?

  1. By conduction through space
  2. By convection through space
  3. By electromagnetic waves through space
  4. By particles of heated gas from the Sun
Show answer & explanation
✓ Answer: CBy electromagnetic waves through space
Award 1 mark for identifying that thermal radiation travels as electromagnetic waves through the vacuum of space. A is incorrect — conduction requires a medium of particles. B is incorrect — convection requires a fluid medium. D is incorrect — while the Sun does emit particles (solar wind), thermal radiation is electromagnetic waves.
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CIE IGCSE Physics: Radiation of thermal energy FAQ

How many CIE IGCSE Physics questions on Radiation of thermal energy are there on Kramizo?
Kramizo currently has 20 exam-board-aligned practice questions on Radiation of thermal energy 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 Radiation of thermal energy 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 Radiation of thermal energy 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 Radiation of thermal energy typically tested on CIE IGCSE Physics papers?
Radiation of thermal energy 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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