The book Encyclopedia of General Science has been prepared to keep the importance of the subject in mind. It covers all the sections of general science like Physics, Chemistry, Biology, Space Science, etc. In the revised edition, we have tried to simplify the complexities of some of the topics so that non-science students feel no difficulty while studying General Science. Being the most important & foundation books for general competition, NCERT books have been kept as the base books while preparing this Encyclopedia of General Science.