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WAEC Physics 2010 Paper

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Question : 3

Total: 50

What is the density of a fuel of relative density 0.72? [Density of water = 1000kg m^-3]

72 kgm^-3
720 kgm^-3
7200 kgm^-3
72000 kgm^-3

Solution:

Concept:

Relative density is the ratio of the density of a substance to the density of water.

Explanation:

Given relative density of fuel

= 0.72

.

Density of water

= 1000 \, \mathrm{kg\,m^{-3}}

.

Density of fuel

= \text{relative density} \times \text{density of water}

.

Substitute the values:

0.72 \times 1000 = 720 \, \mathrm{kg\,m^{-3}}

.

Therefore, the density of the fuel is

720 \, \mathrm{kg\,m^{-3}}

.

Answer:

B.

720 \, \mathrm{kg\,m^{-3}}

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