A piston traps a fixed mass of gas inside a cylinder. Initially, the piston is near the right (open) end of the cylinder, trapping the gas in a large volume.
The piston is then pushed inwards towards the closed end of the cylinder. The temperature of the gas remains constant.
How are the density and the pressure of the gas affected by moving the piston?
Density increases; pressure increases
Density increases; pressure decreases
Density decreases; pressure increases
Density decreases; pressure remains unchanged
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.