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

can you solve the below rebus puzzle?

The person who makes it has no need for it; the person who buys it has no use for it. The person who uses it can neither see nor feel it. What is it?

What has hands, but can’t clap?

What can go through glass without breaking it?

Which wheel of car does not rotate when you turn your car right?

Why did Navjot Singh Sidhu put the new January calendar in the freezer

What has one letter and starts with an E?

John is asked to stand behind Jacob and Jacob is asked to stand behind John. Both of them feel confused about it and don't know what to do?

But it is quite possible, do you know how?

A shopkeeper allows people to buy a cold drink bottle in exchange for five empty bottles. A guy had a party at home and spent 77 cold drink bottles at the party. Now he has 77 empty bottles with him.

How many bottles do you think he can buy in exchange for those 77 empty bottles?