Question

What is heavier on the surface of the earth: $1m^3$ of cotton or $1m^3$ of iron?
(Given: ${\rho }_{iron}>{\rho }_{cotton}$, where $\rho$ denotes density)

• A. Cotton
• B. Iron
• C. Both will have equal weights
• D. Both will have equal masses

Answer 1

The correct option is B Iron

From definition of density,
$\text{Density}=\frac{\text{Mass}}{\text{Volume}}$
$⟹\text{Mass}=\text{Density}\times \text{Volume}$

It is given that volume of iron and cotton is the same $\left(1m^3\right)$. Also, density of iron is much more than cotton. Hence, mass of iron will be more than the density of cotton.