Who always enjoys poor health?

If you say my name, I will no longer exist. What am I?

I am a five-letter word under you,
Remove the first letter and I am above you,
Remove the second as well and I am around you.

Who am I?

You are in a room that has three switches and a closed door. The switches control three light bulbs on the other side of the door. Once you open the door, you may never touch the switches again. How can you definitively tell which switch is connected to each of the light bulbs?

John went to buy some expensive, foreign chocolates. He only had Rs 100 with him. When he reached the shop, he got out and know that on those chocolates, there was a 15% import duty and 5% VAT.

How much worth chocolate should he buy so that he can accommodate it in Rs 100?

Make eight squares by moving only two matchsticks.
Note- Square can be of different sizes.

You have two buckets - one holds exactly 5 gallons and the other 3 gallons. How can you measure 4 gallons of water into the 5 gallon bucket?

(Assume you have an unlimited supply of water and that there are no measurement markings of any kind on the buckets.)

You board a train. The train will have to enter a tunnel soon. You are claustrophobic. Which place is the best for you to sit?

A Doctor always sneezes before the rain. Doctor sneezes, Will it rain?

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?