Primarily intended for the first-year undergraduate students of all branches of engineering, this textbook provides a sound under-standing of the fundamental concepts and principles of physics in a simple and easy-to-understand style. This textbook is organized in nine chapters covering the modules of the syllabus corresponding to electromagnetic theory, quantum mechanics and statistical physics, solid state physics, super- conductivity, X-rays and ultrasonics. Apart from giving a detailed theoretical analysis of the topics, various pedagogical aids such as solved numerical problems and Review Questions are also included at the end of each chapter. An effort has been made to ensure that all the topics taught in a single semester are presented within a single volume. Though the book is written in accordance with the syllabi prescribed by the Guru Gobind Singh Indraprastha University, but the topics covered in this book are also prescribed in the syllabi of almost all the universities and institutes. Key Features : – Numerous solved problems and numerical exercises in each chapter for the thorough understanding of the concepts and laws discussed in the chapter – Key Points at the end of each chapter for quick revision – Review Questions, Numerical Problems and Objective Questions based on the pattern of Previous years- Examination papers