What is the percentage of nitrogen in urea on weight

Choose the correct water image of the given figure (X) from amongst the four alternatives.  

Which of the following combination is correct?

Which one of the following boxes is kept just above the box F?

Which person among the following likes Badminton?

Four of the following five are alike in a certain way based on the above arrangement. Find which one does not belongs to the group?

How many persons participate before D?

How many chocolates are there in the box with Snickers?

How many people live above the floor on which N lives?

Who lives on the ninth floor ?

Who among the following person goes immediately before I?