What has many keys but can’t open a single lock?

Solve this riddle by finding the odd one out from the rest.

What does does this rebus picture means ?

What is the below Rebus indicate?

Replace the question mark with the correct number, given the pair of numbers exhibits a similar relationship?

? : 3839 :: 11 : 1209

A sea diver is a real show-off. He showed everyone that he can hold his breath underwater for 15 minutes.

I went to the diver and told him that I can be underwater for double the time i.e 30 minutes.
He responded that he will give me 100$ if I would be able to do it. I won 100$.

What did I do?

What is the coolest letter in the alphabet?

Assume there are approximately 5,000,000,000 (5 billion) people on Earth. What would you estimate to be the result, if you multiply together the number of fingers on every person's left hand? (For the purposes of this exercise, thumbs count as fingers, for five fingers per hand.) If you cannot estimate the number then try to guess how long the number would be.

Teacher ask the student

'Why are you standing on that chair in music class ?'.

what did student replied ?

Which word is least like the others? Third, fourth, fifth, sixth, seventh, eighth, ninth?