I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

There is a movie name hidden in the picture that is attached with this question. Can you find out which movie is it?

A word I know has six letters it contains, remove one letter and 12 remain. What is it?

Open a Laptop which is password protected. Hint for the password is given as below:

1 mobile 3 books 2 Boards 1 night 4 balls 2 lighters 1 ghost 1 hat 3 watches

What brings you down but never up?

Here is a conversation between a couple who both are software professionals.

Husband: Hey! What is your date of birth?
Wife Replied Angrily: It is 591062400
Husband after doing some calculations replied, "Got It".

What is the DOB of the wife?

What occurs twice in a week, once in a year but never in a day?

When Jack was six years old he hammered a nail into his favourite tree to mark his height. Ten years later at age sixteen, Jack returned to see how much higher the nail was. If the tree grew by five centimetres each year, how much higher would the nail be?

What is the fastest way to double your money?

What goes through cities and fields, but never moves?