An aluminum lid is screwed very tightly onto a glass jar. When both the lid and the neck of the jar are placed under hot running water, the lid becomes much easier to unscrew.
Which statement explains why the lid can be removed more easily?
The glass jar contracts when heated.
The aluminum lid contracts when heated.
The glass jar expands more than the aluminum lid when heated.
The aluminum lid expands more than the glass jar when heated.
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.