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?

How can you write nineteen in a manner that if we take out one, it becomes twenty?

Identify Me

Hint1: I am a god
Hint 2: I am a planet
Hint 3: measurer of heat

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

When we see 2 but call 10?

I am first found in caves, now prolific online; I am a depiction, a drawing, a symbol, or sign. I will convey whichever mood you could wish; or for that matter, a fist, flask, or fish. What am I?

Using four sevens (7) and a one (1) create the number 100. Except for the five numerals, you can use the usual mathematical operations (+, -, x, :), root and brackets ()

What has one letter and starts with an E?

If you read clockwise, you can form a word by inserting three missing letters in the picture given below. Can you do it?

A king sentenced a man to the death sentence for some crime he had committed. Known for his kindness, the king told the culprit that he had a choice to die in a way he decides.

The culprit was clever and said something that saved him from death. What method do you think he must have chosen for his death?