This revised edition is based on the new syllabus of JNTU, Hyderabad 2009-10. The new syllabus includes emerging topics like Elements of Statistical Mechanics, Physics of Semiconductor devices and Acoustics of Buildings and Acoustic quieting. In this edition these new topics have been included. Salient features and Many more objective questions and answers, fill in the blanks, etc., have been added to facilitate the students to have self-evaluation of the subject. and Concepts of Electromagnetics, Electrical Technology and Electromechanics are elaborated further in Magnetic Properties chapter. and Superconductivity, Lasers and Fiber Optics are made simple and student friendly. and Chapter on Nanotechnology is expanded. This JNTU Special Edition will be useful to the students in acquiring full knowledge of the subject and prepare for examinations thoroughly.