NSO — National Science Olympiad
Science Olympiad for Classes 1–12. Select your class range and practise topic-wise.
Classes 1-4
Plants & Animals
Basic characteristics, habitats, food chains, and adaptations of plants and animals
Practise →Human Body
Body parts, senses, basic organs, hygiene, and healthy habits for young learners
Practise →Classes 5-7
Food & Nutrition
Nutrients, food groups, digestion, deficiency diseases, and food safety
Practise →Motion & Measurement
Types of motion, distance, speed, time, forces, and basic measurement units
Practise →Classes 8-10
Electricity & Magnetism
Electric circuits, Ohm's law, magnetic fields, electromagnetic induction
Practise →Chemical Reactions
Types of chemical reactions, balancing equations, acids, bases, salts, and redox
Practise →Classes 11-12
Mechanics (Physics)
Kinematics, Newton's laws, work-energy-power, rotational motion, gravitation
Practise →Organic Chemistry
Hydrocarbons, functional groups, IUPAC nomenclature, reactions of organic compounds
Practise →The National Science Olympiad (NSO) is a school-level science competition conducted by the Science Olympiad Foundation (SOF) for students in Classes 1 to 12. It tests scientific reasoning, conceptual understanding and logical thinking rather than rote memorisation.
NSO is held at two levels: a school-based Level 1 test, and Level 2 for the top performers. Topic-wise practice with clear explanations helps students master both the science syllabus and the logical-reasoning questions that the olympiad emphasises.
| Conducting body | Science Olympiad Foundation (SOF) |
| Eligibility | Classes 1 to 12 |
| Sections | Logical Reasoning, Science, Achievers Section |
| Questions (Classes 1–4) | 35 questions for 35 marks |
| Questions (Classes 5–12) | 50 questions for 60 marks |
| Duration | 60 minutes |
- Logical Reasoning — patterns, series, analogies and spatial reasoning
- Science — the class-level science syllabus (physics, chemistry and biology concepts as per class)
- Achievers Section — higher-order-thinking questions carrying more marks
- Focus on understanding concepts and their real-world application rather than memorising definitions.
- Practise logical-reasoning questions regularly — they are scoring and often overlooked.
- Attempt the Achievers Section carefully; these questions decide the top ranks.
- Use timed topic-wise practice to build speed.
Who can take the SOF NSO?
Students from Class 1 to Class 12 can participate; the paper is set separately for each class.
What sections does NSO have?
Logical Reasoning, Science and the Achievers Section. Higher classes have proportionally more questions.
How many questions are in NSO?
Classes 1–4 answer 35 questions (35 marks); Classes 5–12 answer 50 questions (60 marks).
How long is the NSO exam?
The exam duration is 60 minutes.
Are these NSO practice questions free?
Yes. All class-wise NSO practice on Safe Learning for Kids is free, with explanations.