Question id 332 - Preflight Preparation - FAA PPL(A) - Private Pilot Airplane

Frost changes the basic aerodynamic shape of the airfoils, thereby decreasing lift
Frost slows the airflow over the airfoils, thereby increasing control effectiveness.
Frost spoils the smooth flow of air over the wings, thereby decreasing lifting capability

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