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?

You are on a Boat in the mid of a river. You have two cigarettes with you. One of these two you have to light, how will you light the cigarette?

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

What's the next in the series?

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

Can you name an animal whose killing cannot be performed without spilling your own blood?

It has horns but can’t beep. It is like to bleat but It is not a sheep. What is it?

What Adam and Eve do not have but the rest of the people have?

I’m tall when I’m young, and I’m short when I’m old. What am I?

Mr Red Lives in the red house.
Mr Green Lives in the greenhouse.
Mr Yellow Lives in the yellow house.

Who lives in the Whitehouse?

We have four gears with below features=> Both Gear A and D has 60 teeth=> Gear B has 40 teeth=> Gear C has 20 teeth=> Every two minutes, Gear B makes 25 full turns.What is the relative speed of Gear A and Gear B?