A pure liquid is cooled steadily in a cold room. Its temperature falls, then stays constant for four minutes, then falls again. What is happening during the four minutes?
The liquid is freezing and energy is still being transferred away from it
The liquid is freezing and no energy is being transferred away from it
The liquid is still cooling but the thermometer cannot show the change
The liquid has stopped cooling because it is now at room temperature
40 exam-style questions on AQA GCSE Physics 3.2 Internal energy and energy transfers, covering 3.2.1 Internal energy, 3.2.2 Temperature changes in a system and specific heat capacity, and 3.2.3 Changes of state and specific latent heat. Each one has a worked solution and a mark scheme showing where the marks go.