It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

Queen Elizabeth organised a royal party.

To Avoid uninvited guest royal family set a password.
Jack (an uninvited person) plan to enter the party. He stand nearby the door.

First guest comes, the security person said 'twelve' and guest replied with six.
Second guest comes , the security person said 'six' and guest replied with 'three'.

Jack thought is enough and he walked to the entry point. The security person said 'eight' , Jack replied smilingly 'four'.
He was immediately thrown out of the party. why ?

Which statement is true out of the following?
One statement here is false.
Two statements here are false.
Three statements here are false.

This is a simple one. You just have to count the number of Fs in the given sentence.

Finished Files are the result of years of scientific study combined with the experience of years.

How many did you count?

1 rabbit saw 9 elephants while going to the river. Every elephant saw 3 monkeys going toward the river. Each monkey had 1 parrot in each hand. How many animals are going towards the river?

In a rainy season, one day 3 huge ladies walked under a normal-sized umbrella.
The umbrella is not huge enough to accommodate all 3 ladies yet not a single lady got wet. Why?

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

I know a ten-letter word in the English language which can be typed using only the top rows of the computer keyboard.

When is the top of a mountain similar to a savings account?

A man in a car saw a Golden Door, Silver Door and a Bronze Door. What door did he open first?