T or f in a pinch, a pile of bricks or water pipes can be used in place of jack stands when using hydraulic jacks.

I would say this is false first for the bricks with the force of the pressure of lifting the car or heavy object with the jack the bricks will most likely crack and also the water pipe depending on what it is made of if ceramic will break and only if the pipe has a thick gauge and is steel it might stand up to the pressure.