That sounds so strangee in english.

There's nothing wrong with the English here.

Consider this context: you and a friend are looking at a box with some things inside. Your friend knows what all the things are. One object in the box is much smaller than all the other things in the box, and you have no idea what it is. So you ask, "What is the very small thing?"

This should be "What is the smallest thing?"

Tiny?

"What thing is very small?" doesn't work?

i know...lol