John and Jacob are twin brothers. One of them is a liar whereas the other one is a truth-teller.

I called their home number and one of them picked up.
I asked. 'Does John lie?' The person replied with a yes.

Whom did I talk with, John or Jacob?

How can you throw a ball as hard as you can and have it come back to you even if it doesn't hit anything there is nothing attached to it and no one else catches or throws it.

What part of the chicken has the most feathers?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

I am a normal creature, but I have five hands. I can even have more but even then I will be considered normal.

Who am I?

I’m tall when I’m young, and I’m short when I’m old. What am I?

The picture shows the dice results in each couple of throws. If they are actually following a pattern, can you find out the missing one?

Can you count the number of squares in the figure below?

They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?

Below is the sum of symbols in each row and column in the figure. Analyzing the figure, can you find out the value of the symbols?