Name a key which is hardest to turn.

The teacher told the student that if he told a lie then he will be expelled from school and if he told the truth then he still is expelled from school.

What can a student say to prevent his being expelled from school?

In the picture that is attached with this question, you can find a square which comprises of four little squares inside it. Consider this square to be made with matchsticks. You have to remove two matchsticks such that only two squares remain instead of five.How will you do it ?

A wooden log balances equally on the scales when weighed with three-quarters of a pound and three-quarters of a wooden log.

Can you calculate the weight of the entire wooden log?

What breaks yet never falls, and what falls yet never breaks?

They do not possess flesh or feathers or scales or bone
But still, they are blessed with fingers and thumbs of their own.

As we know that white starts the game of chess. Can you find the scenario shown in the picture below is possible when all the white pieces are at the original place while the black pawn is not as in the below picture?

Things are just as they seem, right? Well, check again.
Can you count the number of tigers in this picture ?

What can run but never walk, have a mouth that never speaks, have a head that never weeps, and have a bed but never sleeps?

2, 3, 5, 9, 17, _ What is the next number in the sequence?