Don't waste 4 hours hunting for a free PDF. Spend that time learning the derivation of the Schrodinger Wave Equation instead. Your CGPA will thank you.
The book "Engineering Physics" by Dr. S.L. Gupta and Sanjeev Gupta (often referred to simply as Gaur & Gupta) has been a staple for DAVV, RGPV, UPTU, and dozens of other state universities for over a decade. Engineering Physics Gaur And Gupta Pdf
Skip the long derivations. Read the "Key Formulae" summary at the end of each chapter. Don't waste 4 hours hunting for a free PDF