The outside walls of a building are made thicker. The thermal conductivity of the walls is unchanged. What happens to the rate of cooling of the building?
it increases, because energy is transferred through a greater mass of wall
it increases, because the outside surface of the wall now has a larger area
it stays the same, because the thermal conductivity of the wall is the same
it decreases, because energy is transferred through the wall more slowly
40 exam-style questions on AQA GCSE Physics 1.2 Conservation and dissipation of energy, covering 1.2.1 Energy transfers in a system and 1.2.2 Efficiency. Each one has a worked solution and a mark scheme showing where the marks go.