This book is an essential and comprehensive study guide meticulously designed for aspirants of the UGTRB Physics Examination. Covering core concepts of Thermal Physics across 15 chapters, the book details the kinetic theory of gases, degrees of freedom, equipartition of energy, Maxwell's distribution of speeds, specific heat capacities of gases, Joule-Kelvin effect, liquefaction of gases, thermal conductivity of solids, blackbody radiation, laws of thermodynamics, entropy, Maxwell's thermodynamic relations, and the third law of thermodynamics. It is enriched with conceptual theory, detailed mathematical derivations, worked-out numerical problems, and competitive-level MCQs to ensure complete exam mastery.