Name a key which is hardest to turn.

What has a ring but no finger?

A boy was locked in a room by some robbers. All that is in the room is a piano, a calendar, and a bed. The room is locked from the outside. What does he eat, drink, and how does he escape and get out?

Can you tell a 3D object that has just two surfaces?

2, 3, 5, 9, 17, _ What is the next number in the sequence?

In the following picture, E is going to slide the object down and as per the terrain and the physics, the round object is going to travel all the way till the end. Now, can you analyze who all people will die when it happens?

I throw two dice simultaneously.

What is the probability of getting a sum as 9 of the two numbers shown?

Look at me. I can bring a smile to your face, A tear to your eye, Or even a thought to your mind. But, I can't be seen. What am I?

There's one "sport" in which neither the spectators nor the participants know the score or the leader until the contest ends.

What is it?

What goes up but never comes down?