Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

A donkey is behind another donkey
I'm behind that second donkey
But there is a whole nation behind me

It is a murder you can describe in a word.

You measure my life in hours
I serve you by expiring
I vanish faster when I am thin
and slower when I am thick
The wind is my energy
What am I?

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 peacock is a bird that does not lay eggs. How do they get baby peacocks?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

By including only four matchsticks in below picture, you have to make "Four Triangles And Two Squares"

In the picture that is attached with this question, you can find a square which comprises of four little squares inside it. Consider this square to be made with matchsticks. You have to remove two matchsticks such that only two squares remain instead of five.How will you do it ?

There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?

What is the riddle which can be asked all day with a different correct answer each time.