What this tests
Syllabus point 2.2 — Thermal properties and temperature, in Thermal physics. Difficulty hard (estimated from the question's demands, not a Cambridge rating).
Also set in
The same question, as Cambridge printed it in other papers.
Cambridge IGCSE Physics 0625 · 2.2 Thermal properties and temperature
June 2012 · Paper 13 · Question 18
One real Cambridge question from Thermal physics, with the official answer. Cambridge has printed this question 2 times.