Question

If small nails are spread on the floor, then how can you collect then quickly?

Answer 1

Nails are small, sleek and can spread quickly on the ground if they fall and it can become slightly difficult to pick them up.

To quickly collect the nails you can use a magnet as they are made of metal and magnet can pull them towards itself with its magnetic force

Answer 2

We know that iron is a magnetic material.

So, we can use magnet to separate it.

We just have to simply move the $\textbf{magnet}$ over the surface, this will attract all the iron and all iron will get collecred.