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& 1: Science1. Motion2. Force and Laws of Motion 3. Gravitation4. Work and Energy5. Sound6. Matter in Our Surroundings7. Is Matter Around us Pure8. Atoms and Molecules9. Structure of Atom10. Cell–The Fundamental Unit of Life11. Tissues12. Diversity in Living Organisms13. Why do We Fall Ill 14. Natural Resources15. Improvement in Food Resources Section 2: Logical Reasoning1. Analogy2. Classification3. Series Completion4. Coding and Decoding5. Number, Ranking, and Time Sequence Test 6. Alphabet Test7. Blood Relation Test8. Mathematical Operations9. Arithmetical Reasoning10. Inserting the Missing Character11. Series 12. Paper Cutting 13. Mirror Images14. Water Images15. Cubes and Dice Section 3: Achievers' SectionHigher Order Thinking Skills (HOTS)Short Answer QuestionsMODEL TEST PAPER – 1MODEL TEST PAPER – 2MODEL TEST PAPER – 3HINTS AND SOLUTIONS