BECE Science 2018 Paper

Concept:Density is the mass of a substance per unit volume. The volume of water displaced by a completely immersed object is equal to the object’s volume.Explanation:The metal is totally immersed, so its volume is equal to the displaced water volume.Volume of the metal $= 5.0\ \mathrm{cm}^3$.Mass of the metal $= 35.0\ \mathrm{g}$.Density is given by:$$\text{Density} = \frac{\text{Mass}}{\text{Volume}}$$Substitute the values:$$\text{Density} = \frac{35.0\ \mathrm{g}}{5.0\ \mathrm{cm}^3} = 7.0\ \mathrm{g}\ \mathrm{cm}^{-3}$$Hence, the correct choice is A.Answer:$$7.0\ \mathrm{g}\ \mathrm{cm}^{-3}$$