Can you replace the question mark with the correct number in the below table sequence?

I had an infinite supply of water and 5 litres and 3 litres jars.

How would you measure exactly 4 litres in the least number of steps?

You are in a room with no metal objects except for two iron rods. Only one of them is a magnet.
How can you identify which one is a magnet?

You bought me for dinner but never eat me. What am I?

The measurement of time, That can't be found on a clock, But can be looked upon on a map.

Who is He ?

How many letters are in the alphabet?

Decode the below four famous ciphers:

8P of the SS
1M of the E
1S of the SS
60M in 1H

They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?

Find out a multi-digit number that if multiplied by the number 9 or any of its multiplications products (i.e. 18, 27, 36, 45,..) will result in the multiplication factor repeated (n) number of times.

There was once a college that offered a class on probability applied to the real world. The class was relatively easy, but there was a catch. There were no homework assignments or tests, but there was a final exam that would have only one question on it. When everyone received the test paper it was a blank sheet of paper with a solitary question on it: 'What is the risk?'.Most students were able to pass, but only one student received 100% for the class! Even stranger was that he only wrote down one word!
What did he write?