This textbook has been designed to meet the needs of B.Sc. First Semester students of Physics as per Common Minimum Syllabus prescribed for Ranchi University and other Universities and Colleges under the recommended National Education Policy 2020 in Jharkhand. The theory starts with Differential Calculus, Vector Calculus, Orthogonal Curvilinear Coordinates, Elasticity, Flexure of Beam, Surface Tension, Fluid Motion, Central Force Motion, S.H.M. and Special Theory of Relativity. The practical part contains experiments such as Measurements & Random errors, Elastic constants, Acceleration due to Gravity and Viscosity. Oral questions are incorporated at the end of each experiment which are useful for Practical examination. These all are lucidly explained in this book.