A long concrete highway is built with small gaps, known as expansion joints, between the concrete slabs.
Why are these gaps necessary?
The concrete slabs contract on hot days.
The concrete slabs expand on cold days.
The concrete slabs expand on hot days.
The concrete slabs contract on cold days.
528 exam-style questions on CIE IGCSE Physics 2.2 Thermal properties and temperature, covering 2.2.1 Thermal expansion of solids, liquids and gases, 2.2.2a Internal energy and temperature, 2.2.2b Specific heat capacity, 2.2.3a Melting, boiling, condensation and solidification, 2.2.3b Evaporation, and 2.2.3c Cooling by evaporation. Each one has a worked solution and a mark scheme showing where the marks go.