Can you convert the number zero(0) into a positive number using just one mathematical operator ?

Identify the movie name through below Rebus containing Pi Mouse and coconut tree..

A father's child, a mother's child, yet no one's son.

Who am I?

I’m tall when I’m young, and I’m short when I’m old. What am I?

A man has eighty-one cows ( numbered 1,2,3...81 as such). The beauty is that cow no. 1 gives 1ltr of milk, cow no. 2 gives 2ltrs of milk and so on. The man wants to equally distribute the cows among his nine sons so that each one of them gets the same quantity of milk.

Find the next number in the series

12, 20, 40, 72, 116, 172 ?

Katrina wants to go on a date and prefers her date to be tall, dark and handsome.

Of the preferred traits - tall, dark and handsome - no two of Shahrukh, Ajay, Salman and Akshay have the same number.
Only Shahrukh or Akshay is tall and fair.
Only Ajay or Salman is short and handsome.
Shahrukh and Salman are either both tall or short.
Ajay and Akshay are either both dark or both fair.
Who is Katrina's date?

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

Find the smallest sentence with all the English alphabet.

Solve the following series:
AZ, GT, MN, __, YB