If the weight of an object is w, its volume is v and if it is made of a material of density d, then their relation can be written as

$w = d + v$

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$v = d + w$

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$w = d \times v$

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$v = d \times w$

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Solution

The correct option is C
$w = d \times v$

The unchanging relation between the weight of an object (w), its volume (v) and density (d) of the material it is made of is given by,

$w = d \times v$

For example, if the density of iron is 7.8, then unchanging relation between the weight of an iron object (w) and its volume is (v) is given by,

$w = 7.8 \times v$

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