I am dry when I go inside, but wet when I am pulled outside.
The longer I am inside, the stronger I get
When I am completely out, I am wet and I literally sag
Who am I?

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

What is the Surname of Barbie Doll?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

During which month do people sleep the least?

He does not have any heart but still, He manages to live.
If you kill him, you will eventually die but yet you kill him.
He cannot run, who is He?

I am taken from a mine and shut up in a wooden case, from which I am never released, and yet I am used by almost every person. What am I?

When I get multiplied by any number, the sum of the figures in the product is always me. What am I?

I am a type of food that is often found in the fridge and can be white in colour. What I am?
Hint 1: I am a dairy product.
Hint 2: You can spread me on the bread.