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

What has 13 hearts but no other organs?

I am a word that begins with the letter “i.” If you add the letter “a” to me, I become a new word with a different meaning, but that sounds exactly the same. What word am I?

On one occasion, A Boy collects 71 rupees in form of 20 paise and 25 paise. He collects a total of 324 coins.

Can you tell me how many 20-paisa and 25-paisa he got?

What part of the chicken has the most feathers?

Divide 110 into two parts so that one will be 150 per cent of the other. What are the 2 numbers?

Who always enjoys poor health?

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?

I have Rs.50 and I spend it in the way as below.

Take one out and scratch my head, I am now black but once was red. What am I?