Which Number is the odd one out?

A) 7145
B) 2716
C) 5321
D) 4135

I have lakes with no water, mountains with no stone and cities with no buildings. What am I?

In which direction should the missing arrow point?

Find the missing number in the image below.

A guard is positioned at the one side of the bridge saying ‘A’. His task is to shoot all those who try to leave from ‘A’ to the other side and say ‘B’. He also need to welcome the person who comes from another side ‘B’ to his side ‘A’. The guard comes out of his post every 1 hour and looks down the bridge for any people trying to leave. You are at side ‘A’ and wish to go to another side ‘B’. you also know that it would take 1:45 hr to cross the bridge. How will you cross the bridge?

Thirty friends were on a hiking trip when they decided to enjoy the bonfire. They assembled for it and agreed to play a game. For that, they divided themselves into five teams with seven members each, forming five rows.

How did they manage to achieve this formation?

What number does the below three word/phrase identify and why?
1. Deck
2. Year
3. Singing in the Rain

If in a code language, DISTANCE is written as IDTUBECN and DOCUMENT is written as ODDVNTNE, the how will THURSDAY be coded as in the same language?

Solve the following series:
AZ, GT, MN, __, YB

The dirtier I get, the whiter I look. Who am I?