Physics 2013 JAMB Past Questions - Question 15: What volume of alcohol will have same mass as 4.2m-³ of petrol?

Correct Answer

C

Explanation

To determine the volume of alcohol that has the same mass as 4.2 m³ of petrol, we need to know the density of both substances. The density of petrol can vary depending on its composition, but for the sake of this example, let's assume it has a density of 750 kg/m³.

To find the mass of 4.2 m³ of petrol, we can multiply the volume by the density:

Mass of petrol = Volume of petrol × Density of petrol
              = 4.2 m³ × 750 kg/m³
              = 3150 kg

Now, let's assume the density of alcohol is 789 kg/m³. To find the volume of alcohol that has the same mass as 3150 kg, we can divide the mass by the density:

Volume of alcohol = Mass of alcohol / Density of alcohol
                = 3150 kg / 789 kg/m³
                ≈ 3.99 m³

Therefore, approximately 3.99 m³ of alcohol will have the same mass as 4.2 m³ of petrol.