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 have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

Yesterday I fell from 30 feet high ladder but I don't get hurt. Why?

Two fathers and two sons went fishing one day. They were there the whole day and only caught 3 fish. One father said, that is enough for all of us, we will have one each. How can this be possible?

You board a train. The train will have to enter a tunnel soon. You are claustrophobic. Which place is the best for you to sit?

John was piloting a plane behind a car but was never able to overtake it. Why?

Sherlock Holmes was challenged to make a pre-drawn line smaller without erasing it. He did it in fractions of seconds. How?

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

ST ND RD TH '?'

In the figure that has been attached to this question, each digit represents a digit. The similar letters carry the same integer value. Can you expose the original digits?

Next Number in the Series,

5, 16, 49, 104, ?