Question

Arrange the following substances in the increasing order of hardness.
Sponge, brick, iron rod, diamond [1 mark]

Answer 1

$\bullet$ Materials that are not easy to compress are called hard substances.
$\bullet$ Depending on the ease of compressibility of an item or its ability to withstand the pressure applied, the order of hardness would be:
Sponge < Brick < Iron Rod < Diamond [1 mark]