Why are gaps left between the adjacent concrete slabs of a highway road?
to allow for expansion of the concrete on a hot day
to allow for contraction of the concrete on a hot day
to allow for expansion of the concrete on a cold day
to allow for contraction of the concrete on a cold day
96 exam-style questions on CIE IGCSE Physics 2.2.1 Thermal expansion of solids, liquids and gases. Each one has a worked solution and a mark scheme showing where the marks go.