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 provides a comprehensive collection of questions and answers related to hydrology, water resources, and related topics, covering 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. It is organized into chapters with questions and answers to aid understanding, includes a chapter devoted to water resources of India, and is intended as a resource for students, researchers, professionals, and those preparing for written tests and interviews.