Can you solve the tricky chess rebus puzzle below by ciphering the hidden meaning?

John was writing his first book. After saving the document, he locked his laptop with a password and mentioned some phrases for the hint box.

A friend of his tried opening his laptop but found out that it was password protected. Following is the hint that appeared.
1 mobile 3 books 2 roars 1 night 4 balls 2 lighters 1 ghost 1 hat 3 watches.

Can you help him in cracking the password?

Before Mount Everest was discovered, what was the highest mountain in the world?

What does this mean?

CCCCCCC

You are given four results as below:
1111 = F
2222 = E
3333 = T
Then, can you find out how to code 4444?

P is the father of Q and S is the son of R. T is the brother of P and has a daughter U. If R is the sister of P, then what is the relation between U, Q and S?

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

Can you find a rabbit in the given picture?

Kids with the most attentive eyes can spot a different watermelon in 4 seconds. Can you? Test your eyes now!

A mile-long train is moving at sixty miles an hour when it reaches a mile-long tunnel. How long does it take the entire train to pass through the tunnel?