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?

Suppose you are sitting in an interview and the interviewee asks you an aptitude question.

You have three buckets with a capacity of 4 litres, 8 litres and 10 litres and you have a large tank of water. Now you have to measure 3 litres of water precisely using those buckets. How will you do it?

Which is heavier: a ton of bricks or a ton of feathers?

Consider this: Arnold Schwarzenegger has a big one. Michael J. Fox has a small one. Prince doesn’t have one. The Pope has one but never uses it. Bill Clinton has one and uses it all the time. What is it?

Can you make numbers like 24, using numbers 3,3,7 & 7 with any arithmetic operator?

What does Alexander the Great and Winnie the Pooh have in common?

People put me on the table and cut me but do not eat me. What am I?

There is a place where if I stand up straight, I will still be considered sideways.

What's the next in the series?

H, Be, F, S, Mn, Kr, In, Gd, Tl, ?

I am under you when I am whole.
I shift above you if you remove the first letter.
I come all around you if you remove the second as well.

Can you tell me who I am?