Which Number is the odd one out?

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

There are 20 people in an empty, square room. Each person has full sight of the entire room and everyone in it without turning his head or body, or moving in any way (other than the eyes). Where can you place an apple so that all but one person can see it?

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?

Can you decipher these quotes by Albert Einstein?
Blf xzm mvevi hloev z kilyovn lm gsv ovevo lm dsrxs rg dzh xivzgvw.

After a heavy Thanksgiving meal, the night watchman went to work. In the morning, he told his boss he had dreamed that a saboteur planted a bomb in the factory and that he felt it was a warning. The boss promptly fired him. Worker confused, Why boss fire him?

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

The picture shows the dice results in each couple of throws. If they are actually following a pattern, can you find out the missing one?

If,
9 * 8 * 7 = 65
8 * 7 * 6 = 50
7 * 6 * 5 = 37

Find
6 * 5 * 4 = ?

Before Mount Everest was discovered, what was the highest mountain in the world?

You can see three almost identical images below. Can you spot the odd one out from them?