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O-Level Science Practice Test Online
O-Level Combined Science practice test covering all three sciences: Biology (cells, transport, genetics, ecosystems), Chemistry (bonding, equations, acids, electrolysis, rates), and Physics (motion, forces, energy, waves, electricity, radioactivity). Matches Cambridge O-Level 5129 and IGCSE Combined Science.
About this O-Level Science practice test
Cambridge O-Level Combined Science is one of the most widely sat qualifications in Pakistan, Malaysia, Sri Lanka and East Africa. This generator creates exam-style questions across Biology, Chemistry and Physics — with full explanations — so students can practise the exact question types that appear in both papers.
O-Level Science Practice Test sample questions
These starter questions help you launch a science mock test quickly. Swap them with your own worksheet, notebook, or textbook questions any time.
1. Define osmosis. 2. Name the process by which glucose is broken down in cells to release energy. 3. What is the difference between ionic and covalent bonding? 4. Balance: Mg + HCl → MgCl₂ + H₂ 5. State Newton's First Law of Motion. 6. A wave has frequency 250 Hz and wavelength 1.2 m. Calculate its speed. 7. What is the role of chlorophyll in photosynthesis? 8. Name the product formed at the cathode during electrolysis of copper sulphate solution. 9. A car decelerates from 20 m/s to 0 in 5 seconds. Find its deceleration. 10. What type of radiation is most ionising: alpha, beta or gamma? 11. Describe how the digestive system breaks down starch. 12. What is the pH of an acidic solution: less than 7, 7, or greater than 7? 13. Calculate the resistance of a component with voltage 9 V and current 3 A. 14. Explain why plants need both photosynthesis and respiration. 15. Name the type of bond that holds water molecules together.
Related search topics
This page is built for students looking for o-level science practice test, chapter practice, and quick school exam revision.
Why this practice page is useful
O-Level Science mark schemes reward precise vocabulary — practising with worked answers builds the habit of using correct scientific terminology.
The generator covers all three sciences in a single session, helping identify which discipline needs the most revision before the exam.
Each explanation teaches the reasoning behind correct answers, making revision more effective than simple memorisation.
O-Level Science units covered
Typical O-Level syllabus units this practice test draws from. Paste questions from any unit below to generate a focused mock test.
- Biology: cells, osmosis/diffusion, photosynthesis, respiration, digestion, transport
- Biology: excretion, homeostasis, reproduction, genetics, ecosystems
- Chemistry: atomic structure, bonding, equations, acids/bases/salts, rates of reaction
- Chemistry: electrolysis, organic chemistry basics, periodic table trends
- Physics: motion, forces, pressure, energy, waves, light and sound
- Physics: electricity, magnetism, radioactivity, half-life
How to use this o-level science practice test page
1. Open the ready-made starter and generate the test.
2. Review the output as a quick O-Level science mock test.
3. Replace the starter with your own previous-year exam questions for more accurate revision.
Explore more for O-Level
Move between subjects in the same exam to build a balanced O-Level revision routine.
Science practice tests for other exams and classes
Continue the same science thread across nearby exams and school classes for year-on-year revision.