I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

Four children having five rocks each were playing a game in which they had to throw the rock at a particular solid area in the water. Child 1- Succeeded in throwing three rocks at a solid area but one of the rocks sunk. Child 3 - His aim was so bad that all rocks got sunk. Child 4- He was awesome and none of the rocks got sunk. Child 2 - Was the winner but was struck by a rock in the head and died. Who killed Child 2?

If your uncle’s sister is not your aunt, what relation is she to you?

Can you find a number that lies one third of the distance between 1/3 and 2/3?

Can you circle exactly four of these numbers such that the total is twelve?

1 6 1
6 1 6
1 6 1
6 1 6

You have two buckets of 11 liters and 6 litres.
How can you measure exactly 8 litres?

Which tank will fill first?

What goes up but never comes down?

Can you count the number of seconds in a year?

Clue: You need to bother about calculation.

In a science lab, a petri dish hosts a healthy colony of yeast for an experiment. Now every minute, all the yeast cells divide into two. At noon, there was just a single cell of yeast and at 1:22, the Petri dish was half full. Can you calculate when the dish will be full of yeast?