It is our privilege to bring out the present book titled “Engineering Physics ? Theory and Practical” for engineering students of U. P. Technical University, Lucknow. It is well known that Physics is not only the basic subject from which all the branches of engineering are derived but is also used in most of the technological developments and their advancements. In this regards, it becomes the compulsory course for all engineering graduated students. Since U. P. Technical University has revised the syllabus of Engineering Physics from academic session 2013?14, therefore the present textbook is an attempt to fulJl the needs of all engineering students according to the new revised syllabus. The subject matter in the book has been presented in easy, effective and systematic way starting from basic concepts for the sake of continuity and better understanding of the subject. The whole subject matter has been divided into theory and practical sections as per the UPTU syllabus. The University runs two courses of Engineering Physics (NAS-101 and NAS-201) in Jrst and second semester, respectively. Therefore, the theory section of the book contains entire syllabus of both courses presented in 14 chapters according to the papers. Chapters 1?7 contain the syllabus of Jrst paper (NAS-101) and Chapters 8?14 contain the syllabus of second paper (NAS-201).