An office room is warmed using a heater to keep it comfortable during winter. Where should the heater be placed to warm all the air in the room as effectively as possible?
near the ceiling of the room
near the floor of the room
halfway up on one of the side walls
on the outside of the window
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.