What's the only room from which no one can enter or leave

If an earthquake is 1 point higher on the Richter Scale than another earthquake which is actually 10 times stronger, how much stronger would an earthquake be if it was just half a point higher on the Richter scale?

What does this mathematical rebus means ?

I am not alive, but I grow; I don't have lungs, but I need air; I don't have a mouth, but water kills me. What am I?

What is both possible and impossible at the same time?

What three numbers, none of which is zero, give the same result whether they’re added or multiplied?

How many minutes are there in Feb 2017?

Note: The shortest answer is the correct answer.

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?

Find three whole, positive numbers that have the same answer when multiplied together as when added together.

I cannot talk, but I always reply when spoken to. What am I?