A student determines the density of an irregularly shaped piece of volcanic rock. The rock is lowered into a measuring cylinder partly filled with water to measure its volume. Which other apparatus does the student need to calculate the density of the rock?
a balance
a thermometer
a metre rule
a stopwatch
169 exam-style questions on CIE IGCSE Physics Density, covering Density. Each one has a worked solution and a mark scheme showing where the marks go.