Question id 179 - Preflight Preparation - FAA PPL(A) - Private Pilot Airplane

An altitude of 500 feet above the highest obstacle within a horizontal radius of 1,000 feet.
An altitude allowing, if a power unit fails, an emergency landing without undue hazard to persons or property on the surface.
An altitude of 500 feet AGL, except over open water or a sparsely populated area, which requires 500 feet from any person, vessel, vehicle, or structure.

Training tests and timed exam simulations FAA PPL(A) - Private Pilot Airplane