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.
321 exam-style questions on CIE IGCSE Physics 2.1 Kinetic particle model of matter, covering 2.1.1 States of matter and changes of state, 2.1.2a Particle structure and motion in solids, liquids and gases, 2.1.2b Gas pressure and particle collisions, 2.1.2c Brownian motion, 2.1.3a The absolute scale of temperature, and 2.1.3b Pressure, volume and temperature of a gas. Each one has a worked solution and a mark scheme showing where the marks go.