This book is an outcome of my teaching of my teaching mathematical physics to the Final Year B. Sc. Physics (Hons.) students a Gargi College, Delhi university for about two decades. Over the years, my experience has been that there is a requirement of a book which and Dirac delta function. These are topics which have several applications in physics and engineering namely in Mechanics, sound Optics, Electrical Circuits. While excellent General Mathematical Physics books are available, the present textbook is an effort towards a simplified presentation of the most common integral transforms that the students of physics, mathematics and engineering learn. the book deals with a diverse set of applications from physics and engineering. It has a chapter dedicated to dirac delta function which has several engineering oriented applications.