What does this rebus riddle means ?

Which English verb becomes past tense just by rearranging the letters?

What goes up but never comes down?

Can you find the odd number in the following?

2716, 4135, 5321 and 7145

I am five letter word that is under you.
If you remove my 1st letter, then I am over you.
If you remove my 1st and 2nd letters then I am all around you.

Who am I?

What do you think with the below Picture ?

Complete the following series. It.s very logical:

1, 4, 5, 6, 7, 9, 11, __?

A man embarked on a questionnaire game. He kept asking the same question to whomever he found. The answer each time was different.

Can you guess what the question was?

When I get multiplied by any number, the sum of the figures in the product is always me. What am I?

One day, all the courtiers from Akbar's court were gathered in the assembly hall when one of them told the Emperor that all his valuables had been stolen by a thief the previous night.
This shocked the Emperor to his core as the place where that courter stayed was the most secured in the kingdom. The Emperor thought that it is not at all possible for an outsider to enter into the courtier's house and steal the valuables. Only another courtier could commit this crime. He quickly called Birbal to identify the thief.
Birbal thought for a while and successfully solved the mystery by identifying the thief in just one statement.
What did Birbal say?