Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

What number when divided in half becomes zero?

Find the last number in the series below:

voN luJ yaM raM ---

An office is divided into 8 cubicles. How many of the cubicles are painted if only 1/8 of the cubicles are painted?

They do not possess flesh or feathers or scales or bone
But still, they are blessed with fingers and thumbs of their own.

On a certain day, John celebrated his birthday. Two days later, his older twin brother Jacob celebrated his birthday.

Is this even possible? How can it be?

I have a mouth but I don't eat.
I have a bank but have no money.
I have a bed but i dont sleep.
I wave but have no hands.

Who Am I ?

Solve the puzzle by telling what does below picture means.

An evil man kidnapped someone and made them take one of two pills. One was harmless, but the other was poisonous. Whichever pill the victim took, the kidnapper took the other one. The victim took their pill with water and died. The kidnapper survived. How did the kidnapper get the harmless pill?

You are playing as white and given four rooks to checkmate the black king in four moves with the following rules 1. You can place one rook every move and ensure the black king should be in check position.2. After four moves the black king should be in the checkmate position.