Water is a precious resource that sustains life on Earth. Hydrology and water resources engineering are essential fields of study that help us understand and manage this vital resource. This book aims to provide a comprehensive collection of questions and answers related to hydrology, water resources, and related topics. The book covers a wide range of topics, including surface water, groundwater, water quality, water resources management, remote sensing and GIS applications in hydrology and water resources, and the impact of climate change on water resources. This book is intended to be a useful resource for students, researchers, and professionals working in the field of hydrology and water resources. The book is organized into chapters, with each chapter covering a specific topic. Each chapter contains a set of questions and answers, to help readers understand the concepts. The aim is to provide readers with a comprehensive understanding of the subject, from the basics to the latest developments. A chapter has been exclusively devoted for water resources of India. In addition, this book is also an excellent resource for individuals preparing for written tests and interviews in the field of hydrology and water resources. The questions and answers provided in the book cover a broad spectrum of topics, allowing readers to enhance their knowledge and improve their performance in such assessments. With its comprehensive coverage, the book is an invaluable tool for those seeking to gain a competitive edge in the job market or enhance their career prospects. The book can serve as a self-study guide or as a reference for those working in the field. Overall, this book is a must-have for anyone interested in hydrology and water resources, whether for academic, professional, or personal reasons.