What does this rebus riddle means ?

I am 5 letters long.
My first two tell you who I am
My first 3 could be a medicine
My last three reversed could be a young boy.
My 4th, 3rd and 2nd in that order could be a fruit drink.
If you have me you may hang me round your neck
WHAT AM I ?

A maths symbol is hidden in the below Bar Graph. Can you decipher it?

It belongs to you, but other people use it more than you do. What is it?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see? What is it?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

What happened when the wheel was invented?

What jumps when it walks and sits when it stands?

I am a word of 12 alphabets.

* Alphabets 12, 4, 7, 2, 5 : Eastern beast of burden
* Alphabets 1, 8, 10, 9 are street made famous by Sinclair Lewis.
* Alphabets 11, 3, 6 are past.

On whole it means a person suffering from delusions of greatness.

What Is it ?

You have an empty wine bottle with a cork that has been secured at the top in a normal way. There is a metal ring inside the bottle that is suspended by a string.

How can you make the metal ring drop to the bottom if you are not allowed to touch anything - not the bottle, not the cork, not the thread and not the ring?