The book 'National Science Olympiad' has been divided into five sections namely Science, Logical Reasoning, Achievers section, Subjective section, Model Papers. In every chapter, the theory has been explained through solved examples, illustrations and diagrams wherever required. Multiple Choice Questions (MCQs) with detailed solutions are provided in the end of each chapter to enhance the problem solving skills of candidates. The questions in the Achievers section are set to evaluate scientific skills of brilliant students whereas the Subjective section includes questions of descriptive nature. Two Model Papers have been included to do practice on the expected questions. A CD containing Study Chart for systematic preparation, Tips & Tricks to crack Science Olympiad, Pattern of exam, and links of Previous Years Papers is accompanied with this book. The book is also useful for various competitive exams such as NTSE, NSTSE, and SLSTSE as well. #v& Sciencea) Lightb) Human Eye and Colourful Worldc) Electricityd) Magnetic Effects of Electric Currente) Sources of Energyf) Chemical Reactions and Equationsg) Acids, Bases and Saltsh) Metals and Non-Metalsi) Carbon and Its Compoundsj) Periodic Classification of Elementsk) Life Processesl) Reproduction in Organismm) Heredity and Evolutionn) Our Environment2. Logical Reasoninga) Analogyb) Classificationc) Coding and Decodingd) Number, Ranking, and Time Sequence Teste) Direction Sense Testf) Alphabet Testg) Blood Relation Testh) Mathematical Operationsi) Seriesj) Paper Foldingk) Paper Cuttingl) Mirror Images3. Achievers' Section Higher Order Thinking Skills (HOTS)Short Answer QuestionsModel Test Paper – 1Model Test Paper – 2Hints and Solutions