Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

Why is it against the law for a man living in Delhi to be buried in Mumbai?

The person who makes it has no need for it; the person who buys it has no use for it. The person who uses it can neither see nor feel it. What is it?

I got a bee but no honey.
got an eye but am still blind.
got a sea but no water.
got a tea but no coffee.
got a why but no answer.

What Am I?

If an electric train is travelling south, then which way is the smoke going?

What 8 letter word can have a letter taken away and it still makes a word. Take another letter away and it still makes a word. Keep on doing that until you have one letter left. What is the word?

Rearrange the letters in "new door" to make one word.

How can one talk without saying a single word?

Which fur should we be getting from the Lion?

If it took eight men ten hours to build a wall, how long would it take four men to build it?