I am a type of room you cannot enter or leave. Raised from the ground below, I could be poisonous or a delicious treat. What am I?

If 24H in a D => 24 hours in a day.
What does "64S on CB" stand for?

what's the probability of getting a king or a queen from a pack of 52 cards?

Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211

Twenty frogs are sitting on a log floating on the surface of a river. Two of them decide to jump off into the water.

How many frogs are there on the log at this moment?

John was so frustrated to be the suspect of being a sleeper terrorist that he shoot himself right between the eyes with a revolver in his toilet. The revolver and the bullets were accurate. Minutes later John walks out of the toilet unharmed.
How can this be possible?

Nine marbles are arranged in the image below. Can you slide two marbles to form a square?

There is something which is always coming but never arrives?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

Can you find out the next digit in the following series ?

0, 0, 1, 3, 2, 6, 3, 9, 4, 12, 5, ?