A sea diver is a real show-off. He showed everyone that he can hold his breath underwater for 15 minutes.

I went to the diver and told him that I can be underwater for double the time i.e 30 minutes.
He responded that he will give me 100$ if I would be able to do it. I won 100$.

What did I do?

Forwards I am heavy, backward I am not. What am I?

It's a protector.
It sits on a bridge.
One individual can see directly through it, while others wonder what it hides.

What is it?

Why Wine Glass Stem is so long?

Buy me, smell me or deliver me, I do not change.

Who am I?

What kind of tree can you carry in your hand?

You bought me for dinner but never eat me. What am I?

It's a 7-letter word.
If we remove 1 letter from it, it remains the same.
If we remove 2 letters from it, it remains the same.
If we remove 3 letters from it, it remains the same.
If we remove all the letters from it, still it remains the same.
What is it?

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

John is the son of Jacob.
So,
Jacob is the_____of John's father?