On a cold morning, a cyclist pumps up a bicycle tyre. Later in the afternoon, the temperature rises and the air pressure in the tyre increases. There are no air leaks and the volume of the tyre remains constant.
Why does the pressure increase?
The air molecules in the tyre move faster.
The air molecules in the tyre expand in size.
The number of air molecules in the tyre increases.
The air molecules in the tyre move more slowly.
126 exam-style questions on CIE IGCSE Physics 2.1.3a The absolute scale of temperature. Each one has a worked solution and a mark scheme showing where the marks go.