JAMB Physics 2010 Paper

Concept:Ice occupies more volume than the same mass of liquid water because of the anomalous expansion of water.Explanation:When ice melts, its mass does not change.Volume is related to mass and density by $V = \frac{m}{\rho}$.Since the density of liquid water is greater than the density of ice, $\rho_{\text{water}} > \rho_{\text{ice}}$.Therefore, for the same mass, the volume of water formed is less than the volume of the ice: $V_{\text{water}} < V_{\text{ice}}$.The container was initially filled to the brim with ice.After the ice completely melts, the resulting water occupies less space than the ice did.So the water level in the container drops.Answer:D. the level of water drops.