The word "Science" brings to mind many different pictures: a fat textbook, a bunch of equations, space shuttle, medicines, and microscopes, etc., simply discovering and learning about the nature around us. There are many branches of science and physics the most basic area of sciences, which deals with energy, matter, space, time and their interactions. The word physics is derived from the Latin word physica, which means "natural thing."Physics as a fundamental science helps to uncover the laws of nature. The language of expression is mathematics. During ancient times, humans studied Stars and celestial bodies that lead to the development of disciplines like astronomy and mathematics. Based on size and speed, Physics as a subject is categorized in several categories. There are many ways to learn physics, but often students face difficulty in solving a problem by the concept they have learned in the class. Our book is designed to help students in this area. Each chapter in the book provides a summary of a concept, along with many practice problems. Content is developed by experts in physics and has been successfully used by many students. Below topics are covered in this book: -SEMICONDUCTOR DEVICES -Atoms -Nuclei