Science Olympiad Sample Papers and Practice for Classes 3–12
Looking for Science Olympiad sample papers for Classes 3 to 12? You’re in the right place! Choose your class, explore useful practice questions, and learn how to use a sample paper to build confidence in Science. This guide brings together class-wise resources, simple download guidance and 20 original questions with answers and explanations.
Start with the School Connect Olympiad Science resource library. Some 2026 sample papers are ready to download, while others are still being added. The guide below shows where to begin and suggests enjoyable ways to keep learning in the meantime.
Find Your Science Olympiad Sample Paper
| Your resource | What you can find | Explore |
|---|---|---|
| Class 3 Science sample paper | Ready to download. Practise Class 3 Science with the SCO sample paper. Check the class and set on the PDF before starting. | Class 3 sample paper |
| Class 3 answer key | Available. Check your answers after completing the paper, making sure you have the matching set. | Class 3 answer key |
| Class 7 Science sample paper | Coming soon. The latest sample is being prepared. You can revise the syllabus or try the other available practice resource below. | Class 7 sample update |
| Class 7 extra practice | A past-paper-style practice resource is listed for students who want more Science questions. | Class 7 Science practice |
| Classes 4–6 and 8–10 | Choose your grade in the Science resource library to see its syllabus, sample-paper listings and latest downloads. | Browse Science resources |
| Classes 11–12 | Older learners can explore available Science resources and relevant Physics, Chemistry or Biology topics according to their course. | Explore senior-class subjects |
Helpful tip: The Class 3 sample is a solved practice set. Sample-paper titles may use a newer year than the material inside, so read the cover and match the answer key to your exact paper. For Class 7, the new sample is marked Coming soon. You can still explore its practice questions and revise the latest syllabus.
Explore Science Olympiad Practice for Your Class
Choose your class below to explore more Science questions on our blog. Then open the SCO Science resource library for the latest syllabus and sample-paper choices. A class guide may include reading material or practice activities rather than a direct PDF download.
Which Science Olympiad is this? Some earlier articles use the name NSO; the School Connect event is now presented as the SCO International Science Olympiad (ISO). When choosing a paper, check that its organiser and class match the competition you’re preparing for.
How to Download and Practise With a Sample Paper
- Select the grade and Science subject: use the official SCO ISO class list and verify the subject actually appears for that class.
- Open the current resource page: a page marked ‘SamplePaper 2026’ is a landing page, not automatically the PDF itself.
- Check the live control: select Download PDF if present. If it says Coming soon, the file is not publicly downloadable from that page yet.
- Check the cover and metadata: verify Science, exact class, sample-paper or examination-set label, year, and whether it is a general model paper or explicitly a Level 2 document.
- Attempt first, then use the matching key: the class, set or paper number should match; do not reuse a Class 3 answer key for a different grade.
- Ask for Level 2 proof separately: current round eligibility, grading, duration and paper format require the organiser’s relevant invitation and rules. A generic PDF label is not enough.
How Should Students Prepare for Level 2 Science?
Every Olympiad has its own learning stages and question types. A Level 2 round, where offered, usually calls for deeper understanding and more careful reasoning. Start with the correct syllabus and a sample paper, then practise explaining why an answer is right. Your current exam instructions will tell you about your stage, date and paper pattern.
If you’re entering an exam, check the current exam calendar and the information in your confirmation. Until then, sample papers are an excellent way to explore topics and build your Science problem-solving skills.
Sample Papers, Past Papers and Answer Keys Explained
| Resource | How it helps you learn |
|---|---|
| Sample paper | Try questions similar in style to the subject you’re studying |
| Previous-year practice | Explore questions from an earlier or specially prepared practice collection; check the year and class on the document |
| Answer key | See which answers match the paper you attempted, then explain the science behind them |
| Syllabus | Discover the topics to learn or revise before the exam |
| Level 2 practice | Develop deeper reasoning with multi-step or more challenging Science questions |
Science Topics to Explore at Each Grade
| School level | Examples of age-appropriate Science foundations | Sample reasoning prompt |
|---|---|---|
| Classes 3–4 | Plants, animals, air, water, solids, safe hygiene, simple observations | What changes if one plant gets less light? |
| Classes 5–6 | Materials, habitats, basic forces, evaporation, mixtures and fair tests | How would you isolate one variable in an experiment? |
| Classes 7–8 | Photosynthesis, acids and bases, heat, pollination, ecosystems and measurement | Which evidence would support or contradict a hypothesis? |
| Classes 9–10 | Motion, cells, light, reactions, electric principles and scientific calculations | Can you explain the formula and its units? |
| Classes 11–12 | More advanced physics, chemistry and biology, depending on school stream | What assumptions and controls make a scientific conclusion valid? |
Try 20 Science Olympiad Questions With Answers
Here are 20 original Science questions—two for each class from 3 to 12—with explanations you can learn from. Start with the questions for your class, then try a slightly harder one when you’re ready. You can use these for individual practice, a classroom quiz or a family Science discussion.
Question 1 — Class 3 illustrative science
Which part of a bean plant generally absorbs water from soil?
A. Roots | B. Flowers | C. Petals | D. Fruit
Answer: A. Roots. Roots absorb water and dissolved minerals from the soil. They usually also anchor the growing plant.
Question 2 — Class 3 illustrative science
Which of these objects is attracted to a typical classroom magnet?
A. Plastic ruler | B. Iron nail | C. Wooden stick | D. Glass jar
Answer: B. Iron nail. Iron is a magnetic material, so an ordinary magnet can attract an iron nail.
Question 3 — Class 4 illustrative science
Which object lets most visible light pass through so you can see clearly?
A. Cardboard sheet | B. Brick wall | C. Clear glass pane | D. Wooden door
Answer: C. Clear glass pane. Clear glass is transparent: it transmits enough visible light to let objects behind it be seen.
Question 4 — Class 4 illustrative science
What name describes water vapour cooling into tiny liquid water droplets?
A. Melting | B. Freezing | C. Evaporation | D. Condensation
Answer: D. Condensation. Condensation occurs when water vapour cools and changes to liquid droplets, helping form clouds.
Question 5 — Class 5 illustrative science
A rolling toy gradually stops on a flat floor. Which force commonly opposes its motion?
A. Friction | B. Buoyancy | C. Magnetism only | D. Gravity alone
Answer: A. Friction. Friction and rolling resistance oppose motion between the wheels, bearings and floor; other losses can also occur.
Question 6 — Class 5 illustrative science
Two otherwise similar plants receive different amounts of sunlight. What did the investigator deliberately change?
A. Pot labels | B. Sunlight received | C. Owner’s name | D. Table colour
Answer: B. Sunlight received. The amount of sunlight is the independent variable. For a fair comparison, water, plant type and other conditions should remain similar.
Question 7 — Class 6 illustrative science
What method best separates insoluble sand from water?
A. Freezing the mixture | B. Using a magnet | C. Filtration | D. Adding more water
Answer: C. Filtration. A filter can trap the insoluble sand while letting the water pass through. Dissolved salt would not be removed this way.
Question 8 — Class 6 illustrative science
Which condition usually helps a wet towel dry fastest, all else equal?
A. Cold still air | B. A sealed cold box | C. High humidity with no airflow | D. Warm moving air with low humidity
Answer: D. Warm moving air with low humidity. Higher temperature, airflow and lower humidity generally increase evaporation from a wet towel.
Question 9 — Class 7 illustrative science
Which process lets green plants use light energy to make sugars from carbon dioxide and water?
A. Photosynthesis | B. Digestion | C. Rusting | D. Fermentation only
Answer: A. Photosynthesis. During photosynthesis, green plants capture light energy to make carbohydrates from carbon dioxide and water; oxygen is also released.
Question 10 — Class 7 illustrative science
What usually happens to red litmus paper in a basic solution?
A. It stays red in every basic solution | B. It turns blue | C. It becomes transparent | D. It catches fire
Answer: B. It turns blue. Red litmus turns blue in a sufficiently basic solution. Litmus is a simple acid–base indicator.
Question 11 — Class 8 illustrative science
Which material is generally a better conductor of heat?
A. Dry wood | B. Foam | C. Copper | D. Plastic
Answer: C. Copper. Copper is a metal with high thermal conductivity compared with these insulating materials.
Question 12 — Class 8 illustrative science
What term means the transfer of pollen from anther to stigma?
A. Germination | B. Transpiration | C. Fertilisation | D. Pollination
Answer: D. Pollination. Pollination is the transfer of pollen from an anther to a suitable stigma. Fertilisation is a later process involving gametes.
Question 13 — Class 9 illustrative science
A runner moves 12 metres in 3 seconds at steady speed. What is the speed?
A. 4 m/s | B. 9 m/s | C. 15 m/s | D. 36 m/s
Answer: A. 4 m/s. Average speed is distance divided by time: 12 ÷ 3 = 4 metres per second.
Question 14 — Class 9 illustrative science
Which organelle is strongly associated with ATP production during aerobic respiration?
A. Cell wall | B. Mitochondrion | C. Nucleus only | D. Ribosome
Answer: B. Mitochondrion. Mitochondria are major sites of aerobic respiration and ATP generation in typical eukaryotic cells.
Question 15 — Class 10 illustrative science
A converging lens receives light rays parallel to its principal axis. Where do ideal rays meet?
A. At infinity | B. At the lens rim | C. At its principal focus | D. At the object in every case
Answer: C. At its principal focus. In the ideal thin-lens model, a converging lens focuses incoming parallel rays at its principal focus.
Question 16 — Class 10 illustrative science
Which equation correctly balances hydrogen combining with oxygen to form water?
A. H₂ + O₂ → H₂O | B. H₂ + 2O₂ → H₂O | C. H₂ + O₂ → 2H₂O | D. 2H₂ + O₂ → 2H₂O
Answer: D. 2H₂ + O₂ → 2H₂O. The balanced equation has four hydrogen atoms and two oxygen atoms on each side: 2H₂ + O₂ → 2H₂O.
Question 17 — Class 11 illustrative science
Velocity increases from 6 m/s to 18 m/s in 4 s with uniform acceleration. What is acceleration?
A. 3 m/s² | B. 6 m/s² | C. 12 m/s² | D. 24 m/s²
Answer: A. 3 m/s². Acceleration equals the velocity change divided by elapsed time: (18 − 6) ÷ 4 = 3 metres per second squared.
Question 18 — Class 11 illustrative science
In ordinary double-stranded DNA, which base pairs with adenine?
A. Cytosine | B. Thymine | C. Guanine | D. Uracil
Answer: B. Thymine. Adenine pairs with thymine in DNA through two hydrogen bonds. Uracil is used in RNA instead of thymine.
Question 19 — Class 12 illustrative science
At 25 °C, what is the approximate pH of pure neutral water?
A. 3 | B. 5 | C. 7 | D. 11
Answer: C. 7. At 25 degrees Celsius, pure neutral water has equal hydronium and hydroxide activities, corresponding to approximately pH 7.
Question 20 — Class 12 illustrative science
For a simple Mendelian cross Aa × Aa with full dominance, what fraction of offspring is expected to have genotype aa?
A. All offspring | B. One-half | C. Three-quarters | D. One-quarter
Answer: D. One-quarter. The Punnett square gives AA, Aa, Aa and aa in a 1:2:1 genotype ratio, so one of four is expected to be aa.
Your Seven-Day Science Practice Plan
| Day | Useful task | What to record |
|---|---|---|
| 1 | Check the correct syllabus and whether a download is genuinely available | Grade, subject, version and source link |
| 2 | Review two science concepts with a textbook or class notes | A sentence explaining each concept |
| 3 | Attempt a few suitable sample-paper questions without the answer key | Questions needing more explanation |
| 4 | Mark only with the correct paper’s key | Concept errors versus reading or calculation slips |
| 5 | Practise a safe observation or teacher-approved example | Prediction, observation and a short conclusion |
| 6 | Try fresh original questions instead of memorising the same letters | Whether reasoning transfers to a new problem |
| 7 | Discuss corrections and decide if an optional competition is appropriate | One clear learning goal for the next week |
For additional practice, follow the source links to find each paper and its matching answer key. Use the materials as provided by the publisher and try writing your own explanations of the scientific ideas.
Free Practice and Optional Olympiad Registration
You can use the learning guidance and original questions in this article without paying an exam fee. If you decide to join an SCO examination, open the registration page to see the subjects, dates, price and any learning services included with your selected option.
Would you like a plan for tackling tricky Science questions? Read our Science Olympiad preparation strategy guide for ideas about experiments, scientific reasoning and revision.
Questions Parents and Students Often Ask
Where can I find Science Olympiad papers for Classes 3–12?
Choose your class in the table above. Each link leads to practice resources, and the official SCO Science library helps you locate current syllabus and sample-paper pages.
Can I download a Class 3 Science sample paper?
Yes. The Class 3 Science sample page provides a PDF option. Try it first, then compare with the matching answer key.
Is there a Class 3 answer key?
Yes. The official Class 3 answer-key page is linked above. Use it with the same question set.
What can Class 7 students study while the sample paper is coming soon?
Review the Class 7 syllabus, explore its available practice resource and solve new questions from the topics you’re learning.
Does every class have a Level 2 Science paper to download?
Available papers differ by class and competition stage. Start with the subject directory, and use your current exam instructions for Level 2 details.
What is the difference between a sample paper and a previous-year paper?
A sample helps you practise the expected skills. A previous-year paper or practice collection can show earlier question styles; check its year and organiser.
How do I use an answer key to improve?
Solve the questions first. Then review your answers and explain why the correct choice works. Make a note of topics to revise.
Can Classes 11 and 12 use these Science questions?
Yes. Senior students can try the questions here and then select Physics, Chemistry or Biology resources that match their course.
How should I prepare for tougher Level 2 Science questions?
Learn the topic, study examples, practise explaining experiments and observations, then move to more challenging questions a little at a time.
Is this learning guide free to read?
Yes. You can read the explanations and practise the original questions here. Any exam registration or additional services are separate choices.
Enjoy Your Next Science Challenge
Ready to begin? Pick your class from the Science Olympiad resources, choose a topic you enjoy and solve a few questions. If your sample PDF is still coming soon, try the questions above and come back for new resources. When you’re ready for the competition, you can view exam dates and registration. Enjoy exploring Science!
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