How do you go from 98 to 720 using just one letter?

A time long back, there lived a king who ruled the great kingdom of Trojan House. As a part of the renovation of the kingdom to meet future security needs, he asked his chief architect to lay down a new play in a manner that all of his 10 castles are connected through five straight walls and each wall must connect four castles together. He also asked the architect that at least one of his castles should be protected with walls. The architect could not come up with any solution that served all of King's choices, but he suggested the best plan that you can see in the picture below. Can you find a better solution to serve the king's demand?

What is next number in the pattern below:

131 517 192 123 ?

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

What breaks yet never falls, and what falls yet never breaks?

How many squares, of any size, can you find on this chessboard which do not contain a Rook?

Decode the below four famous ciphers:

8P of the SS
1M of the E
1S of the SS
60M in 1H

In a university, a professor gave a set of three problems to the three brilliant students of his class. See the image for the questions.

Two trains start at the same time, one from Bangalore to Mysore and the other from Mysore to Bangalore. if they arrive at their destinations one hour and four hours respectively after passing one another, how much faster is one train running than the other?

Decode the movie name from the below picture?