What country can make you shiver?

I am quite hot but become too cold if you remove the first two letters. What am I?

There are people and strange monkeys on this island, and you can not tell who is who (Edit: until you understand what they said - see below). They speak either only the truth or only lies.
Who are the following two guys?
A: B is a lying monkey. I am human.
B: A is telling the truth.

Which is Odd One Out and why?

4377

3954

9862

8454

9831

What can you hold in your right hand, but never in your left hand?

A man is trapped in a room. The room has only two possible exits doors. Through the first door there is a room constructed from magnifying glass. The blazing hot sun instantly fries anything or anyone that enters. Through the second door there is a fire-breathing dragon. How does the man escape?

Can you name any English verb that becomes its past tense by simply rearranging the alphabets ?

John asked Jack, "The time right now is 7 pm. Can you tell me what will be the time 23, 999, 995 hours later ?"

While Bella does not know the answer, do you ?

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

A tree doubled in height each year until it reached its maximum height over the course of ten years. How many years did it take for the tree to reach half its maximum height?