There was an aeroplane crash, every single person died, but two people survived. How is this possible?

How can a man go eight days without sleep?

There is a brick of gold and a brick of iron in a boat (both 10-inch blocks), if they are both dropped into the water which will make the water level higher?

One day, John and his friends were playing around. Jacob hit something with a Pin and it popped. John's dad came into the room that very moment, but he wasn't mad. In fact, he was smiling. What did Jacob hit?

What is the difference between a jeweller and a jailer?

How can you write nineteen in a manner that if we take out one, it becomes twenty?

There is one thing that goes round the house and also inside the house but never even share a brief touch. What is it?

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

What is the centre of gravity?

Queen Elizabeth organised a royal party.

To Avoid uninvited guest royal family set a password.
Jack (an uninvited person) plan to enter the party. He stand nearby the door.

First guest comes, the security person said 'twelve' and guest replied with six.
Second guest comes , the security person said 'six' and guest replied with 'three'.

Jack thought is enough and he walked to the entry point. The security person said 'eight' , Jack replied smilingly 'four'.
He was immediately thrown out of the party. why ?