1What is relative density? Why does it have no unit?
2If the density of gold is 19 g/cm³, what is its relative density, and what does that number mean?
3Why are the density in g/cm³ and the relative density always the same number?
4State the rule for floating and sinking, and explain why heaviness is not the deciding factor.
5An iron box measuring 1 m by 0.5 m by 0.2 m has a mass of 20 kg. Find its density and say whether it floats.
6Iron sinks in water, but ships made of steel float. Explain.
7An egg sinks in pure water but floats in a solution of salt water. Give the reason.
8If an object has a relative density of 0.92, will it float or sink in water? Analyse with reasons.
9A wooden ball floats low in the water while a cork ball rides high. Explain the difference.
10Aluminium has a density of 2.7 g/cm³. Find its relative density and say what happens to an aluminium ball in water.