Natural Science CLEP Prep Practice Exam

Nuclear force is the correct answer because this type of force results from the interactions between particles in the nucleus of an atom. This force is responsible for holding the nucleus together despite the repulsive forces between positively charged protons. Electromagnetic force, option A, is a force between charged particles but it does not specifically refer to nuclear interactions. Frictional force, option B, is a force between two surfaces in contact and is not related to nuclear interactions. Thermal force, option D, is also not related to nuclear interactions and refers to the transfer of thermal energy.