I am a prime number.
The double of myself is equal to the square of me.

which number am I?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

This is a most unusual paragraph. How quickly can you find out what is so unusual about it? It looks so ordinary, you'd think nothing was wrong with it. Actually, nothing IS wrong with it. But it is not as ordinary as you might think. If you think about it for a bit, you will find out why it is truly so unusual. So what is it? What is so unordinary about this paragraph?

Can you convert the number zero(0) into a positive number using just one mathematical operator ?

Can you find the missing number in the third row?
35 20 14
27 12 18
5 2 ?

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

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?

The horse jumps over the king.
Strangely there is absolutely no scratch on him.

Can anyone explain, how is this possible?

Your mother’s brother’s only brother-in-law is asleep on your couch. Who is asleep on your couch?

Can you find the missing letter in the sequence?
S - T - I - L - ? - T - F - Y - C