Science Olympiad Level 2 Practice: Questions and Study Plan
Challenging science questions become easier when you connect concepts, read evidence carefully and explain the reason behind every answer. This Science Olympiad preparation guide helps students practise multi-step scientific reasoning, calculations, experimental design and data interpretation.
Explore 24 Science Olympiad Level 2-style practice questions with worked answers, learning goals for different class groups, a ten-day study plan and useful class-wise resources. Choose problems that suit your current science syllabus and progress to harder challenges as your understanding improves.
Start with the School Connect International Science Olympiad subject page, the 2026 Science syllabus and current competition rules when preparing for your registered session.
How to Prepare for Challenging Science Olympiad Questions
More demanding science problems often involve two connected ideas: reading a set of measurements and choosing a physical law, applying a concept to an experiment, or combining a formula with the correct units. Begin with the subjects in your class syllabus, then practise unfamiliar situations that use those ideas.
| Learning stage | Concepts to practise | Helpful strategy |
|---|---|---|
| Classes 3–5 | Habitats, plants, materials, water, light, simple measurement | Identify what changes and what stays the same |
| Classes 6–8 | Forces, motion, circuits, density, energy and physical changes | Make a diagram and check units |
| Classes 9–10 | Electricity, chemistry, motion, biology and experimental data | Link the correct principle to the evidence |
| Classes 11–12 | Quantitative physics, chemical amounts, genetics and advanced reasoning | State assumptions before calculating |
Visit the SCO International Science Olympiad for subject preparation and the 2026 Science syllabus overview for topic planning.
Six Strategies for Advanced Science Problem-Solving
- Read the evidence: identify the quantities, units, conditions and question being asked.
- Choose the science concept: decide whether the problem concerns a force, an electric circuit, a reaction, a living system or data interpretation.
- Write the relationship: use a sketch, formula, food-chain diagram or simple table.
- Calculate step by step: keep units with each measurement and check whether the result is reasonable.
- Explain the cause: support the answer using the stated observation or scientific principle.
- Review and practise again: try a different situation that uses the same idea.
24 Science Olympiad Level 2 Practice Questions with Answers
Choose the class group most useful to you and try each question independently. Read the worked explanation immediately afterwards to understand both the concept and the calculation.
Classes 3–5: careful observations and science puzzles
Question 1. Two identical seedlings grow in the same soil with equal water but different amounts of sunlight. What is the factor the student is testing?
A. Amount of sunlight | B. Type of soil | C. Amount of water | D. Type of seedling
Answer: A. Amount of sunlight. The amount of sunlight is changed; keeping the other conditions similar makes the comparison more useful.
Question 2. Rainfall over three days is 4 mm, 8 mm and 6 mm. What is the mean daily rainfall?
A. 4 mm | B. 6 mm | C. 5 mm | D. 8 mm
Answer: B. 6 mm. Add the readings: 4+8+6=18 mm. Divide by 3 days to obtain 6 mm.
Question 3. A student moves an opaque object closer to a fixed torch while keeping the screen in place. What usually happens to the size of its shadow?
A. It becomes smaller | B. It disappears | C. It becomes larger | D. Its colour changes
Answer: C. It becomes larger. With the object closer to the torch, light spreads around it at a greater angle, creating a larger shadow on the fixed screen.
Question 4. A bulb lights when a battery, wires and switch form a complete circuit. What happens when the switch is opened?
A. The bulb becomes brighter | B. The battery makes more energy | C. The wires turn into insulators | D. The bulb goes out
Answer: D. The bulb goes out. Opening the switch breaks the conducting path, so current stops and the bulb goes out.
Question 5. Which action best protects loose soil on a slope during heavy rain?
A. Plant ground-cover vegetation | B. Remove all roots | C. Loosen the soil every day | D. Pour detergent on the slope
Answer: A. Plant ground-cover vegetation. Plants and their roots help hold soil together and reduce runoff erosion.
Question 6. A fair test compares how quickly two ice cubes melt at different room temperatures. Which feature should be kept the same?
A. Room temperature | B. Starting size of each ice cube | C. Place each bowl is kept | D. Amount of warmth from surroundings
Answer: B. Starting size of each ice cube. The cubes should start at a similar size. The temperatures are the conditions being compared.
Classes 6–8: calculations and scientific explanations
Question 7. A 3 kg trolley experiences a net force of 12 N. What is its acceleration?
A. 2 m/s² | B. 3 m/s² | C. 4 m/s² | D. 6 m/s²
Answer: C. 4 m/s². Newton’s second law states a=F/m. Here 12/3=4 metres per second squared.
Question 8. A cyclist covers 200 m in 40 s at constant speed. What is the speed?
A. 4 m/s | B. 8 m/s | C. 6 m/s | D. 5 m/s
Answer: D. 5 m/s. Speed is distance divided by time: 200/40=5 m/s.
Question 9. A mineral sample has mass 270 g and volume 90 cm³. What is its density?
A. 3 g/cm³ | B. 2 g/cm³ | C. 4 g/cm³ | D. 6 g/cm³
Answer: A. 3 g/cm³. Density=mass/volume=270/90=3 g/cm³.
Question 10. Water warms from 20°C to 60°C. What is the rise in temperature?
A. 20°C | B. 40°C | C. 30°C | D. 80°C
Answer: B. 40°C. Subtract the initial temperature from the final temperature: 60−20=40°C.
Question 11. A bag holds three red and two blue marbles. Two are drawn without replacement. What is the probability that both are blue?
A. 1/5 | B. 2/5 | C. 1/10 | D. 1/2
Answer: C. 1/10. First blue has probability 2/5, then second blue is 1/4. Multiply: 2/5×1/4=1/10.
Question 12. A metal and an acid react and release bubbles of hydrogen gas. Which observation is evidence of a gas being produced?
A. The metal has a number on it | B. The beaker is made of glass | C. The acid has a colour | D. Bubbles rise through the liquid
Answer: D. Bubbles rise through the liquid. New gas bubbles appearing during a reaction are evidence that a gaseous product is forming.
Classes 9–10: physics, chemistry and biology reasoning
Question 13. A resistor of 6 Ω is connected across 12 V. What current passes through it, assuming Ohm’s law?
A. 2 A | B. 1 A | C. 6 A | D. 72 A
Answer: A. 2 A. Use I=V/R=12/6=2 amperes.
Question 14. A current of 0.5 A flows for 8 seconds. How much charge passes?
A. 2 C | B. 4 C | C. 3 C | D. 8 C
Answer: B. 4 C. Charge Q=I×t=0.5×8=4 coulombs.
Question 15. Magnesium forms Mg²⁺ and oxygen forms O²⁻ ions. What formula gives a neutral compound?
A. Mg₂O | B. MgO₂ | C. MgO | D. Mg₂O₃
Answer: C. MgO. One Mg²⁺ ion balances one O²⁻ ion, giving MgO.
Question 16. What is the kinetic energy of a 0.3 kg object moving at 10 m/s?
A. 3 J | B. 10 J | C. 30 J | D. 15 J
Answer: D. 15 J. Kinetic energy =½mv²=½×0.3×10²=15 joules.
Question 17. In a simple Mendelian cross Aa × aa, what is the probability of offspring genotype aa?
A. 1/2 | B. 1/4 | C. 3/4 | D. 1
Answer: A. 1/2. The Aa parent can contribute A or a, while aa contributes only a. Half of the offspring are expected to be aa.
Question 18. Two resistors of 3 Ω and 6 Ω are in series across 18 V. What is the current?
A. 1 A | B. 2 A | C. 3 A | D. 6 A
Answer: B. 2 A. Series resistance is 3+6=9 Ω. Current=18/9=2 A.
Classes 11–12: quantitative science challenges
Question 19. What amount of substance is in 18 g of water? Its molar mass is 18 g/mol.
A. 0.5 mol | B. 2 mol | C. 1 mol | D. 18 mol
Answer: C. 1 mol. Moles=mass/molar mass=18/18=1 mol.
Question 20. An ideal gas in a rigid sealed container has pressure 100 kPa at 300 K. What pressure is expected at 450 K?
A. 120 kPa | B. 250 kPa | C. 200 kPa | D. 150 kPa
Answer: D. 150 kPa. For a fixed amount of ideal gas at constant volume, P/T is constant: 100×450/300=150 kPa.
Question 21. A solution has pH 3 and another has pH 5. Approximately how many times greater is the hydrogen-ion concentration in the pH 3 solution?
A. 100 | B. 10 | C. 2 | D. 1000
Answer: A. 100. Each decrease of one pH unit means about ten times greater hydrogen-ion activity; two units correspond to about 100 times in dilute classroom solutions.
Question 22. A 2 kg object changes its velocity from 2 to 8 m/s in 3 seconds. What is the average net force in the direction of motion?
A. 2 N | B. 4 N | C. 6 N | D. 12 N
Answer: B. 4 N. Average acceleration=(8−2)/3=2 m/s². Average net force=ma=2×2=4 N.
Question 23. A sample has a half-life of 4 days. What fraction of the initial amount remains after 12 days?
A. 1/2 | B. 1/4 | C. 1/8 | D. 1/16
Answer: C. 1/8. Twelve days is three half-lives, so (1/2)³=1/8 remains.
Question 24. A wave travels at 340 m/s and has a frequency of 85 Hz. What is its wavelength?
A. 2 m | B. 3 m | C. 5 m | D. 4 m
Answer: D. 4 m. Wavelength=speed/frequency=340/85=4 metres.
Practise Scientific Reasoning with a Small Investigation
Use a safe paper-and-pencil investigation to develop your ability to compare evidence. A teacher can give students measurements from identical toy cars rolling down ramps at different heights, or students can measure travel distance over a flat surface using a ruler. Keep the car, release point and surface conditions consistent while changing one factor.
| Record | What to write |
|---|---|
| Question | How does the starting ramp height affect the distance travelled? |
| Prediction | What do you think will change and why? |
| Fair-test conditions | Same toy car, floor surface, measuring method and release technique |
| Results | Record measured distances for repeated trials at each safe ramp height |
| Explanation | Describe a pattern and a scientific reason, including possible measurement errors |
Use small stable ramps, an open floor area and adult supervision for younger children. Measurements may vary; repeating a test helps you distinguish a pattern from a single unusual result.
Ten-Day Science Olympiad Study Plan
| Days | Preparation activity | Learning goal |
|---|---|---|
| 1–2 | Review your class syllabus and attempt six mixed-topic questions | Identify topics needing more practice |
| 3–4 | Study physics ideas such as forces, motion and energy | Connect laws to measurement |
| 5–6 | Revise relevant biology and chemistry concepts | Explain scientific changes and living systems |
| 7–8 | Practise data questions, diagrams and numerical problems | Work carefully with evidence and units |
| 9 | Try a timed set using the guidance for your exam | Build concentration and pacing |
| 10 | Review errors, explain the toughest questions and revisit weak topics | Consolidate understanding |
Science Olympiad Syllabus, Practice Papers and Exam Information
Explore the SCO Science Olympiad subject resources, the 2026 syllabus and the exam preparation guide. Our Science Olympiad class-wise practice guide offers additional questions and study links across grade levels.
Students preparing for another round can check the Science Olympiad rules for the eligibility and arrangements that apply to their class and examination session. Use the current exam calendar and the relevant registration or examination instructions when making plans.
Frequently Asked Questions
How can I prepare for Science Olympiad Level 2?
Review your class syllabus, practise multi-step questions, show calculations and explain the scientific ideas behind your answers. Use short timed sessions after learning the methods.
Which science topics are useful for harder questions?
Depending on the class, practise forces, energy, circuits, matter, chemical changes, cells, ecosystems, graphs and calculations. Your current syllabus will help you choose the right topics.
Where can students find Science Olympiad practice papers?
Use the SCO Science Olympiad resource page for class-wise learning materials and sample-paper options, and try the practice questions on this page.
How can I check whether I am eligible for Level 2?
Check your result or qualifying information alongside the Science Olympiad rules for your class and selected session.
Can teachers use these questions in classroom practice?
Yes. Choose a group appropriate to the class, encourage students to explain methods and use their responses to identify concepts that need revision.
Do students need laboratory equipment for practice?
No. Graphs, diagrams, safe observations, simple measurement activities and worked problems can all strengthen scientific understanding.
How do I become faster at numerical science questions?
Practise identifying the quantities, writing the correct formula and checking units. Build accuracy first, then gradually work under exam-style time limits.
Where can I find the current exam schedule?
Visit the SCO exam dates page and check the instructions for your registered session.
Continue practising: Pick six problems above, write down your answers, check the reasoning and use the class-wise Science Olympiad guide to strengthen your next topic.
Leave a Reply