An electricity worker installs a metal power transmission line tightly between two poles on a very hot summer day.
When winter arrives, the weather becomes extremely cold. What could happen to the transmission line and why?
It sags and drops lower because it expands
It sags and drops lower because it contracts
It snaps (breaks) because it expands
It snaps (breaks) because it contracts
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.