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

which number am I?

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

81 x 9 = 801. What must you do to make the this equation true?

It is deaf, Dumb and Blind!!!

Still, always tells the truth. What is it?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

I cry without having a voice.
I fly without having wings.
I bite without having teeth.
I whisper without a mouth.

Who am I?

John went to meet his friend Jacob, but when he was about to reach the main gate, John notices that Jacob had a mighty dog who was fastened to the tree. The chain is long enough that it allows the dog to reach the main gate.

How can the John reach the main gate?

In an interview, a boy was asked an unusual question 'How two persons sitting with a table in between them can't see each other?' He was unable to reply. Can you?

Complete the series by replacing "?" with the correct number.

ST ND RD TH '?'

What am I?