Logic riddles with simple answers

There is a big Indian and a little Indian. The little Indian is the big Indians son but the big Indian is not the little Indians father. What is the big Indian?

What is red but it smells like a blue paint?

What has many keys but can't open any doors?

Think of a number. Double it. Add ten. Half it. Take away the number you started with. What is your number?

What does the following represent? N N N N N N N A A A A A A A C C C C C C C

I am a vehicle. I spell the same when you read me forwards as well as backwards. What Am I?

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

I know a number which is spelled in an alphabetical order. Do you?

Our dinner guests cry that we are evil, when they notice their place in the meal. But its no big deal why; we are just one big happy tribe! And we get really fed up with people! Who, What or Are we?

What word in the English language does the following: the first two letters signify a male, the first three letters signify a female, the first four letters signify a great man, the first six letters signify a drug, while the entire world signifies a great woman. What is the word?