What begins with T, ends with T, and has T in it?

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?

No matter how little or how much you use me, you change me every month. What am I?

What jumps when it walks and sits when it stands?

Jigsaw captured 100 people and make them stand in a circle and all these people are labelled as Person1, Person2, Person3... Person100. He made them play a crazy game in which Person 1 shot Person 2 and pass the gun to the next person and so on until one stands alive.

Which person will survive in the end?

Find the Next Number in the Sequence

2 9 3 1 8 4 3 6 5 7 ?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

What does this rebus mean?

O
N
C
E
TIME

The below mentioned letters have been placed in a order using a logic.

DEAD, BALL, FEAR, SHOP

Can you find the logic?

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