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

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?

What Adam and Eve do not have but the rest of the people have?

I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

Find a 9-digit number, which you will gradually round off starting with units, then tenth, hundred etc., until you get to the last numeral, which you do not round off. The rounding alternates (up, down, up ...). After rounding off 8 times, the final number is 500000000. The original number is commensurable by 6 and 7, all the numbers from 1 to 9 are used, and after rounding four times the sum of the not-rounded numerals equals 24.

Why is the Hole below a Lock?

Find the value of "?" in the ball picture Riddle below:

I am a five-letter word under you,
Remove the first letter and I am above you,
Remove the second as well and I am around you.

Who am I?

Solve the puzzle by telling what does below picture means.