What brings you down but never up?

Give it food and it will live; give it water and it will die.

Find the 8 in the below-given Image.

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

What is red and smells like blue paint?

You are in a room with no metal objects except for two iron rods. Only one of them is a magnet.
How can you identify which one is a magnet?

Buy me, smell me or deliver me, I do not change.

Who am I?

Can you find any error in the following sentence?

A taxi was standing outside a fort at night. A man came out of the fort, opened the gate and hit the taxi driver killing him instantly. He took all the money out of the meter and started running till he was caught by a local sheriff.

Find three numbers such that When we multiply three numbers, we will get the prime numbers. The difference between the second and the first number is equal to the third and second.

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