Crown Samanya Gyan by Ritesh Kumar is a Hindi-language general knowledge reference book designed for candidates preparing for various competitive examinations. The book covers a broad range of subjects, including: Ancient, medieval and modern Indian history World history and geography Indian geography and census Indian Constitution and economy Physics, chemistry and biology Environmental science and ecology Science and technology Computer knowledge National and international organisations Sports and important national and international facts Countries, capitals, currencies, flags, area and population Published by Crown Publications, this book is a useful reference for students and competitive-exam aspirants looking to revise general knowledge topics in Hindi.