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ICSE Class 7 Physics Question 4 of 18

Physical Quantities and Measurement — Question 7

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Question

Question 7

The mass of an iron ball is 312 g. The density of iron is 7.8 g cm-3. Find the volume of the ball.

Answer

Mass = 312 g
Density = 7.8 g cm-3
Volume = ?

Density=MassVolume7.8=312VolumeVolume=3127.8=40cm3\text{Density} = \dfrac{\text{Mass}}{\text{Volume}} \\[1em] \text{7.8} = \dfrac{\text{312}}{\text{Volume}} \\[1em] \text{Volume} = \dfrac{\text{312}}{\text{7.8}} = 40 \text{cm}^{3}

So, volume of the ball is 40 cm3.