What is the below Rebus indicate?

In the picture given below, can you find out which digit will take place of the question mark?

John is the son of Jacob.
So,
Jacob is the_____of John's father?

A fresher was sitting in an interview. The interviewer said, "This is the last question of your interview. Tell me the accurate position of the centre of this table where your resume is kept."

How can he answer this question? What will you have answered to such a question?

On a special event at the prison, 5 prisoners John, Jacob, Krist, Tang, and Dang given a chance to go to a sauna and can bring one thing with them.

Following are the things that the prisoners bring with them.
John: A soda
Jacob: Thermos
Krist: Book named "How to kill"
Tang: A Walkman
Dang: Harmonica

Since it is a Sauna, no one can see each other. After a while When the steam is switched, Tang was found dead and there was blood all around.
J Bond was called and he instantly come to know who can be the murderer. How?

Complete the series by replacing "?" with the correct number.

ST ND RD TH '?'

Doctor Alex and a bus driver John are both in love with the same woman named Olivia. The bus driver need to go for a long trip of 10 days, Before he left he gave Olivia 10 apples.

A plane crashed between the border of Mexico and America. Where do you bury the survivors?

Teacher ask the student

'Why are you standing on that chair in music class ?'.

what did student replied ?

You throw me out when you want to use me and you take me in when you don't want to use me.

Who Am I?