What If i Utilize all Digital and Analog pins of Arduino UNO

I making a simple project for which I am using arduino UNO and using all of its Digital and analog pins

Will all the pins will be able to give approx. 4V ???

And will it work perfectly.

Will all the pins will be able to give approx. 4V

Yes but it is the current rating you have you watch not voltage. But I can't see that schematic taxing anything.