Is it a car of yours or is it the car of yours?
Which one is correct:

Is it a car of yours?

or

Is it the car of yours?

For example, one person talk with another one and he points his finger at the car.

Question

Is it a car of yours or is it the car of yours?
Which one is correct:

Is it a car of yours?

or

Is it the car of yours?

For example, one person talk with another one and he points his finger at the car.

Answer

Is that your car?

Answer

No one would ask, "Is it the car of yours?" That is not a natural expression. To ask "is it a car of yours?" implies the person is believed to own more than one car. That's certainly possible, but it would still not be the most natural way of speaking. Do as Dave suggests.

Answer

In English, we show possession by putting the pronoun first. 
my car
your car
her car
his car
our car
their car