This volume is a comprehensive compilation of carefully selected questions at the PhD qualifying exam level, including many actual questions from Columbia University, University of Chicago, MIT, State University of New York at Buffalo, Princeton University, University of Wisconsin and the University of California at Berkeley over a twenty-year period. The topics covered in this book include basic nuclear properties, fission and fusion, symmetries in particle physics, grand unification theories, and experimental methods of high-energy particles, among many others.This latest edition has been updated with more problems and solutions while the original problems are modernized, excluding outdated questions and emphasizing those that rely on calculations. The problems range from fundamental to advanced in a wide range of topics, easily enhancing the student’s knowledge through workable exercises. Simple-to-solve problems play a useful role as a first check of the student’s level of knowledge whereas difficult problems will challenge the student’s capacity on finding solutions.