Test items relating to Project Physics Unit 4 are presented in this booklet. Included are 70 multiple-choice and 22 problem-and-essay questions. Concepts of light and electromagnetism are examined on charges, reflection, electrostatic forces, electric potential, speed of light, electromagnetic waves and radiations, Oersted's and Faraday's work, power, transformer, electromagnetic induction, Hertz's experiment, wave interference, light polarization, Michelson and Morley experiment, Newton's theory of colors, Van Allen belts, and relativity. Suggestions are made for time consumption in answering some items. Besides directions and illustrations for explanation use, related physical equations are provided. The work of Harvard Project Physics has been financially supported by: the Carnegie Corporation of New York, the Ford Foundation, the National Science Foundation, the Alfred P. Sloan Foundation, the United States Office of Education, and Harvard University. (CC)