Name a key which is hardest to turn.

What goes up but never comes down?

Can you identify the direction in which this bus is moving; left or right?

Hint: The bus is moving on the roads of London.

Is the statement valid that it does not matter how much older a sibling is, eventually the younger one will be half as old as the older one?

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

The captain of a ship was telling this interesting story: "We travelled the sea far and wide. At one time, two of my sailors were standing on opposite sides of the ship. One was looking west and the other one east. And at the same time, they could see each other clearly." How can that be possible?

Akbar called Birbal and asked him to draw a line on the floor. He asked Birbal to make that line smaller without erasing it. Birbal smiled and did it before Akbar could blink his eyes.

How did he managed to do it?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

Can you find the missing piece of the Porsche?

A patient was diagnosed with some ailment. He was given five different tablets to take at night at an interval of 15 minutes.

How long will it take the patient to consume all the five tablets?