Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?

How many points are there on the globe where, by walking one mile south, then one mile east and then one mile north, you would reach the place where you started?

You throw me out when you want to use me and you take me in when you don't want to use me.

Who Am I?

If an electric train is travelling south, then which way is the smoke going?

Two in a corner, one in a room, zero in a house, but one in a shelter. What is it?

Spot what is wrong here in below Picture?

John is asked to stand behind Jacob and Jacob is asked to stand behind John. Both of them feel confused about it and don't know what to do?

But it is quite possible, do you know how?

You are confined in a room and given two metal rods. Out of these two rods, one is magnet and the other is the iron rod. They look starkly similar. You don't have any other metal object in the room.

How will you decide which one of those is magnet?

The following sentence is false. The preceding sentence is true.
Are these two sentences true or false?

In a school, there are four subjects. Seventy percent of students study English, seventy five percent of students study Science, eighty five percent of students study Mathematics and eighty percent of students study Spanish.

Can you calculate the percentage of students that study all four subjects?