Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

Why do we preferably have round manhole covers and not square ones?

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

I have feet, but no legs. Which animal Am I?

Which three-digit number, made of consecutive digits, like 567, is 2 less than a cube and 2 more than a square?

The Judge knows that Alamgir was killed by his girlfriend Jasline, but the judge is unsure whether to punish her. Why?

If eleven plus two equals one, what does nine plus five equal?

There are a number of books on a shelf. If one book is the 4th from the left and 6th from the right, how many books are on the shelf?

A train full of passengers goes through a tunnel. When the train comes out from the other end, there is no single person on the train.

How did it happen?

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?