An air-conditioning unit is installed in a room to keep the air cool. Where is the most effective position to install the air-conditioning unit to cool the entire room as efficiently as possible?
Near the floor.
Near the ceiling.
Under a desk in the corner.
Halfway up one of the walls.
73 exam-style questions on CIE IGCSE Physics 2.3.2 Convection. Each one has a worked solution and a mark scheme showing where the marks go.