What is the word or phrase?

Solve the equation by replacing the alphabet with numbers.

MOM + MOM + NO = BOOK=

Who is that with a neck and no head, two arms and no hands? What is it?

A bomb exploded in a room full of married couples and no one died. How?

You have a roll of cloth 1km long. You have a machine which cuts this roll into pieces of 10-meter-long cloth.

How long would it take for the machine to cut the roll if each cut took 4 secs?

I know a country, If you remove the last alphabet of its name, it will become a part of your body. Do you name it?

Can you figure out the logic I used to decide the order of the following words:
gun, shoe, spree, door, hive, kicks, heaven, gate, line, den

Can you make four (4) nines (9) equal 100?

Intelligence Agency need to break the vault but the problem is that they are not able to break the vault.

On the vault, a text is written as:

31 11 33 33 43 45
21 25
31 24 11 31 51 41

To Break the code Intelligence Agency brings a mathematician named Joseph.
Minutes later he deciphers the code.

Whats the code?

You find yourself in a strange place guarded by two guards.One of the guard always say truth while other always lies.You don't know the identity of the two.You can ask only one question to go out from there. What should you ask?