Take away my first letter, then take away my second letter. Then take away the rest of my letters, yet I remain the same. What am I?

What is black when you buy it, red when you use it, and gray when you throw it away?

What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?

A lion and its tamer are standing inside a cage that measures 1 unit in radius. Both of them can effortlessly run at the speed of 1 unit maximum.

1) Suppose the lion is hungry, will he be able to eat up the tamer?
2) If yes, how long can the tamer survive?

I have a five and a three-gallon jar. Assuming there is an infinite supply of water, how can I measure one-gallon water?

Until it is measured, not known. Yet how you miss it when it has gone. What is it?

By including only four matchsticks in below picture, you have to make "Four Triangles And Two Squares"

The barber of Town shaves all men living in the town. No man living in the town is allowed to shave himself. The barber lives in that town. Who then shaves the barber of the town?

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

During an interview, the interviewer ordered hot coffee for the candidate to relieve the stress. The coffee was kept before him. After a minute, the interviewer asked him, 'What is before you?' He replied 'Tea'.

The candidate was selected immediately. Why?