Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

A thief enters a store and threatens the clerk, forcing her to open the safe. The clerk says, “The code for the safe is different every day, and if you hurt me you’ll never get the code.” But the thief manages to guess the code on his own. How did he do it?

If you were to put a coin into an empty bottle and then insert a cork into the neck, how could you remove the coin without taking out the cork or breaking the bottle?

You walk into a room where there are three primates held in their respective cages:
1) A lion who is eating the flesh of a goat.
2) An orangutan who is playing with blocks.
3) A donkey who is sitting idle.

Who is the most intelligent primate in the room?

An artist while painting a scenic beauty, decides to paint three layers of blue colour on the sky.

Which layer will go on the first?

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

Out of four images which one is the odd one out?

There is something which is always coming but never arrives?

Can you convert the number zero(0) into a positive number using just one mathematical operator ?

Rearrange the letters in "new door" to make one word.