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?

There is a brick of gold and a brick of iron in a boat (both 10-inch blocks), if they are both dropped into the water which will make the water level higher?

Why are all black people so quick ?

They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?

In the below-given picture of a pretty girl, there is something wrong. Can you find out what it is?

2 ladies and 2 girls need to cross a river in a boat big enough for 1 LADY or 2 girls. How do they do it?

After teaching his class all about Roman numerals (X = 10, IX=9 and so on) the teacher asked his class to draw a single continuous line and turn IX into 6. The teacher's only stipulation was that the pen could not be lifted from the paper until the line was complete.

Can you place six matchsticks in a manner that each of the matchsticks is in touch with the other five matchsticks?

A finger goes in me. You fiddle with me when you're bored. The best man always has me first. What am I?

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