What does this below rebus puzzle mean?

What is wrong in the below Picture?

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

A man has a barrel filled with oil that weighs 100 pounds, and then he puts something into it. Now the barrel weighs less than 100 pounds. What did he put in the barrel?

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

ST ND RD TH '?'

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

Who is He ?

Which letter of the alphabet has the most water?

Can you place three balls such that the equation shown in the picture holds true?

Consider this about a word: The first two letters signify a male, the first three letters signify a female, the first four letters signify a great, while the entire world signifies a great woman. What is the word?

Complete the given grid with valid words. You can only use the letters AAEEIIMMPPTT.

Hint: The grid reads the same across as down.