A block of metal has a mass of 30 kg and a volume equal to 4 litres. Its density is:

7.5 kg/L

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7 kg/L

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0.75 kg/L

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750 kg/L

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Solution

The correct option is A
7.5 kg/L

Density is defined as mass per unit volume.
It is expressed as,
$D e n s i t y = \frac{m a s s}{v o l u m e}$
Given,
The mass of the block = 30 kg
Volume of the block is = 4L
Using the formula for density,
$D e n s i t y = \frac{30 k g}{4 L} = 7.5 k g / L$
Hence, the density is 7.5kg/L
The correct answer is option (A).

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A block of metal has a mass of 30 kg and a volume equal to 4 litres. Its density is:

The correct option is A 7.5 kg/LDensity is defined as mass per unit volume.It is expressed as, Density=massvolumeGiven,The mass of the block = 30 kgVolume of the block is = 4LUsing the formula for density, Density=30kg4L=7.5kg/LHence, the density is 7.5kg/LThe correct answer is option (A).