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

Who always enjoys poor health?

John is the son of Jacob.
So,
Jacob is the_____of John's father?

Mr Red Lives in the red house.
Mr Green Lives in the greenhouse.
Mr Yellow Lives in the yellow house.

Who lives in the Whitehouse?

I am a type of word that is spelt incorrectly or used differently, on purpose for humour. What am I?
Hint 1: You can find me in a joke.
Hint 2: I am a play on words.

Can you name an animal whose killing cannot be performed without spilling your own blood?

Prove that twice of ten is the same as twice of eleven.

How can you tell a raw egg from a hard-boiled egg?

What kind of tree can you carry in your hand?

You are on a Boat in the mid of a river. You have two cigarettes with you. One of these two you have to light, how will you light the cigarette?