A boy and his father are caught in a traffic accident, and the father dies. Immediately the boy is rushed to a hospital, suffering from injuries. But the attending surgeon at the hospital, upon seeing the boy, says 'I cannot operate. This boy is my son.' How is this situation explained?

What can you see in the middle of March and April that you can never see in any other month?

In Greek mythology, the Sphinx sat outside of Thebes and asked this riddle of all travellers who passed by. If the traveller failed to solve the riddle, then the Sphinx killed him/her. And if the traveller answered the riddle correctly, then the Sphinx would destroy herself. The riddle:

What goes on four legs in the morning, on two legs at noon, and on three legs in the evening?

Oedipus solved the riddle, and the Sphinx destroyed herself.

Which statement is true out of the following?
One statement here is false.
Two statements here are false.
Three statements here are false.

What numbers should go on the bottom line?
3 6 9 15
8 2 10 12
11 8 19 27
19 10 29 39
? ? ? ?

Replace each alphabet with the number (1-9) to make the below equation correct.

AB * C = DE - F = GH / I

What does it mean?

Eight of us go fourth, not back, to protect our king from an attack. What are we?

Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number?

Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?