Two rooms have walls of the same area. The temperature difference across each wall is the same.
The wall of room X is thicker than the wall of room Y, but the material of wall X has a higher thermal conductivity.
Which conclusion can be made from this information?
The two differences both reduce energy transfer, so room X must cool more slowly.
The two differences both increase energy transfer, so room X must cool more quickly.
The two differences must cancel exactly, so both rooms must cool at the same rate.
The two differences have opposing effects, so the faster cooling room cannot be identified.
100 exam-style questions on Edexcel GCSE Physics 3.2 Dissipation and efficiency, covering 3.2.1 Dissipation of energy, 3.2.2 Reducing unwanted energy transfers, 3.2.3 Efficiency, and 3.2.4 Increasing efficiency. Each one has a worked solution and a mark scheme showing where the marks go.