This book provides the essence of aerodynamics, fluid mechanics, experimental methods, gas dynamics, high enthalpy gas dynamics, helicopter aerodynamics, heat transfer, and thermodynamics, describing the underlying principles of these subjects before listing the set of multiple choice questions of each subject, which will prove to be useful for engineering students to comfortably face and win in the competitive examinations for engineering studies, engineering services, civil services, doctoral Degree program entrance and so on. This book will also be of value for those facing job interviews for academic positions in universities and research organizations or laboratories.