BECE Science 2010 Paper

Concept:An object stays afloat when its density is not more than the density of water.Explanation:A less dense object ($\rho_{\text{object}} < \rho_{\text{water}}$) floats partly above the surface.An object with the same density ($\rho_{\text{object}} = \rho_{\text{water}}$) remains suspended in water without sinking, so it also floats in water.An object denser than water ($\rho_{\text{object}} > \rho_{\text{water}}$) sinks.Hence, statements I and III are correct.Answer:D. I and III only