If in a car race, the man who came two places in front of the last man finished one ahead of the man who came fifth, how many contestants were there?

I come in different shapes and sizes.
Parts of me are curved, other parts are straight.
You can put me anywhere you like,
but there is only one right place for me.
What am I?

Can you name any English verb that becomes its past tense by simply rearranging the alphabets ?

There was a kingdom in which the king had no heir to take over his thrown. Even the queen was dead and he himself was on the verge of dying. He thought about it and then summoned all of the teenagers. He gave one seed each to all of them and asked them to grow the plant. He announced that the one with the most beautiful plant will become the king/queen of the empire after the death of the king.

After a month, all of them were called. The king looked at all of the plants but announced the girl with an empty pot as the queen of the empire. Why?

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

Which tank will fill first?

Why Aeroplane windows are round?

There are nine dots in the picture that has been attached with this question. Can you join all the dots by drawing four straight lines without picking up your pen?

Find the Odd One Out?
84129
32418
47632
36119
67626
72927

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?