An electricity technician installs a cable tightly between two utility poles during a very hot summer day.
The weather changes and becomes extremely cold in winter.
Which row in the table correctly describes what could happen to the cable and the reason why?
| What could happen | Why | |
|---|---|---|
| A | It sags further | It expands |
| B | It sags further | It contracts |
| C | It snaps | It expands |
| D | It snaps | It contracts |
Row A
Row B
Row C
Row D
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.