Class 9 Science Important Questions 2025-26 | Free Chapter-wise PDF

If you’re in Class 9, you know Science can be a total love-hate relationship! One day you’re fascinated by Atoms and Molecules, the next you’re tearing your hair out over Gravitation. The difference between rocking your exams and stressing out is to do smart preparation.

That’s where these CBSE Class 9 Science Important Questions come in - think of them as your secret map showing exactly which topics deserve extra attention before your board exams.

Here’s the Best part:

• They help you revise the crucial chapters faster.
• They give you a sneak peek into what examiners usually focus on.
• They prepare you for all types of questions - short, long, objective, or tricky case studies.

Whether you want to practise chapter-wise important questions or download a Class 9 Science Important Questions PDF to revise offline, this guide has everything you need to prepare smart and stay confident.

Chapter-wise CBSE Class 9 Science Important Questions PDF

Below is the complete list of chapter-wise CBSE Class 9 Science Important Questions, aligned with the CBSE Science Syllabus 2025-26, to help you practise and revise effectively.

How to Ace these Class 9 Science Important Questions?

Acing your Class 9 Science exams is all about practising the right questions efficiently. The CBSE Class 9 Science Important Questions are designed to guide you toward the chapters and concepts that matter most. Here’s a step-by-step approach:

Step 1: Begin with NCERT

NCERT is the foundation of everything. Make sure you understand key chapters like Matter and its Properties, important questions or Structure of Atom class 9 questions before moving to additional questions.

Step 2: Practise chapter-wise

Focus on one chapter at a time and solve all related chapter-wise important questions. This ensures thorough understanding without getting overwhelmed.

Step 3: Include different question types

Work on a mix of questions: short and long questions, multiple choice, and case study questions. This prepares you for the variety you’ll see in exams.

Step 4: Learn from mistakes

Keep track of the questions you get wrong, revise those topics, and try again. This improves both accuracy and confidence.

Step 5: Solve sample papers

Use Official CBSE Sample Papers and Class 9 science previous year questions to get familiar with exam patterns and time management.

Step 6: Review and revise

Finally, revisit all CBSE class 9 science chapter-wise questions. Covering important areas from Force and its Effects important questions to Improvement in Food Resources important questions ensures nothing is left out.

Follow this method, and you’ll feel more confident, organised, and ready to face your Science Exam Preparation head-on.

Tips to Use This Class 9 Science Important Question List Effectively

Having a list of CBSE Class 9 Science Important Questions is just the first step. To make it actually useful for your Science Exam Preparation, follow these tips:

1. Start with NCERT basics

Before diving into extra questions, make sure your NCERT class 9 science important questions are clear. This builds a strong foundation.

2. Practice chapter-wise

Pick one chapter at a time - like Structure of Atom class 9 questions or Matter and its Properties important questions - and solve all related questions. This way, you know exactly what each chapter demands.

3. Mix question types

Don’t just stick to short answers. Include Class 9 science multiple choice questions, case study questions, and long-answer questions for balanced preparation.

4. Track your mistakes

Whenever you get a question wrong, note it down. Revisit that chapter or topic - whether it’s Force and its Effects important questions or Sound waves class 9 questions - before trying similar questions again.

5. Use PDFs and offline resources

Download chapter-wise important question answers PDFs or use official CBSE sample papers to practice even when you’re away from your laptop or phone.

Following these steps ensures that you’re not just going through questions randomly—you’re preparing smartly, covering all key topics, and boosting confidence for the CBSE Science Syllabus 2025-26 exams.

Benefits of Practising These Class 9 Important Questions

Working through CBSE Class 9 Science Important Questions is more than just ticking off problems – it actually sharpens your preparation and makes your revision smarter.

• Strengthen your concepts: Solving questions on topics like Atoms and Molecules, Matter and its Properties, or Plant and Animal Tissues helps you understand them better than just reading theory.
• Familiarize yourself with exam patterns: Practising Class 9 science questions for exams 2025 shows you the kinds of questions CBSE usually asks, from short answers to case studies.
• Improve problem-solving speed: Repeated practice with Motion and Laws of Motion or Work and Energy questions trains you to approach problems faster and more accurately.
• Gain confidence: Completing CBSE class 9 science solved questions and chapter-wise important questions gives you a sense of achievement and reduces exam stress.
• Focused revision: By identifying tricky topics like Gravitation or Improvement in Food Resources, you can spend time revising the chapters that matter most.

Class 9 Science Important Questions 2025-26

Here’s an important question for Class 9 Science that you should definitely focus on while preparing for your exams. These cover the essential chapters from the CBSE Science Syllabus 2025-26 and give you a clear idea of what to expect.

Q1. What is an acid? Give an example.
Ans. An acid is a substance that releases hydrogen ions (H⁺) in water. For example, hydrochloric acid (HCl) is a common acid.

Q2. What is a base? Give an example.
Ans. A base is a substance that releases hydroxide ions (OH⁻) in water. Sodium hydroxide (NaOH) is an example of a base.

Q3. What is meant by pH?
Ans. pH is a scale that measures how acidic or basic a solution is, ranging from 0 to 14.

Q4. Define alloy with one example.
Ans. An alloy is a mixture of metals or a metal and a non-metal. Bronze (copper and tin) is an alloy.

Q5. What is photosynthesis?
Ans. Photosynthesis is the process by which green plants make their own food using sunlight.

Q6. What is the law of conservation of mass?
Ans. The law of conservation of mass states that mass can neither be created nor destroyed in a chemical reaction. The total mass of reactants equals the total mass of products.

Q7. What are the properties of acids?
Ans. Acids taste sour, turn blue litmus paper red, and react with metals to produce hydrogen gas.

Q8. List three physical properties of metals.
Ans. Metals are malleable, ductile, and good conductors of heat and electricity.

Q9. What is the role of enzymes in digestion?
Ans. Enzymes are biological catalysts that speed up the breakdown of food into simpler substances during digestion.

Q10. What happens in aerobic respiration?
Ans. In aerobic respiration, glucose reacts with oxygen to release energy, carbon dioxide, and water.

Q11. Explain the process of rusting and conditions necessary for rusting.
Ans. Rusting is the corrosion of iron caused by its reaction with oxygen and moisture, forming iron oxide. The process needs water and oxygen; without these, rusting does not occur. Rusting weakens iron and causes it to crumble over time.

Q12. Describe the structure of the human heart and its function.
Ans. The human heart is a muscular organ with four chambers: two atria and two ventricles. It pumps oxygenated blood to the body and sends deoxygenated blood to the lungs to get oxygen. This continuous pumping maintains the circulation of blood.

Q13. What is the difference between aerobic and anaerobic respiration?
Ans. Aerobic respiration requires oxygen and produces a large amount of energy, while anaerobic respiration does not require oxygen and produces less energy, often resulting in by-products like lactic acid.

Q14. Define electric current and explain how it flows in a circuit.
Ans. Electric current is the flow of electric charge through a conductor. It flows from the positive terminal to the negative terminal of a power source through the connected circuit.

Q15. What are magnetic effects of electric current? Give two applications.
Ans. When electric current flows through a conductor, it creates a magnetic field around it. This effect is used in electromagnets and electric motors.

Q16. Case: A student observes that the weight of an iron nail increases after being left in the open for a few days.
Q: Explain the reason behind this observation.
Ans. When the iron nail is exposed to air and moisture, it reacts with oxygen to form rust, which is iron oxide. This chemical reaction adds oxygen atoms to the iron, increasing the total weight of the nail. So, the nail becomes heavier because rust is actually a combination of iron and oxygen.

Q17. Case: A metal piece can be beaten into thin sheets and drawn into wires.
Q: Identify the type of metal property shown and explain it.
Ans. The metal exhibits malleability and ductility. Malleability means the metal can be hammered or beaten into thin sheets without breaking, while ductility means it can be stretched into wires. These properties occur because metal atoms can slide past each other without breaking the metallic bonds.

Q18. Case: During an experiment, a solution turns blue litmus red.
Q: What type of solution is this? Explain.
Ans. The solution is acidic. Acids release hydrogen ions (H⁺) when dissolved in water, and these ions cause blue litmus paper to turn red. This color change indicates the presence of an acid in the solution.

Q19. Case: A bulb glows when connected in a circuit.
Q: What is required to keep the bulb glowing continuously? Explain.
Ans. To keep the bulb glowing, the circuit must be closed and complete, allowing electric current to flow without interruption. If the circuit is open or broken at any point, the current will stop, and the bulb will go off. Continuous flow of current is essential to power the bulb.

Q20. Case: A plant is kept in sunlight and another in the dark. The one in sunlight grows well while the other wilts.
Q: Explain the reason.
Ans. The plant in sunlight can perform photosynthesis, using sunlight to make food and energy needed for growth. The plant kept in the dark cannot make food because photosynthesis cannot occur without light, causing it to weaken and wilt.

Q21. What is an enzyme?
Ans. Enzymes are proteins that speed up chemical reactions in living organisms without being consumed.

Q22. Define variation with an example.
Ans. Variation refers to differences in traits among individuals of the same species. For example, people have different eye colors.

Q23. What is Ohm’s law?
Ans. Ohm’s law states that current through a conductor is directly proportional to voltage and inversely proportional to resistance.

Q24. What is the difference between renewable and non-renewable resources?
Ans. Renewable resources can be replenished naturally, like solar energy; non-renewable resources, like fossil fuels, are limited and take millions of years to form.

Q25. What is the focal length of a lens?
Ans. Focal length is the distance between the optical center of the lens and its focal point where parallel light rays converge.

Q26. What is the role of the nervous system?
Ans. The nervous system controls and coordinates body activities by transmitting electrical signals between the brain and other parts.

Q27. What is heredity?
Ans. Heredity is the passing of traits from parents to their offspring through genes.

Q28. Define refraction of light.
Ans. Refraction is the bending of light when it passes from one medium to another due to a change in speed.

FAQs

Q1. What types of questions are commonly asked in Class 9 Science exams?
Ans. Questions can be very short, short answer, long answer, and case-based or application-based questions testing concepts, definitions, and problem-solving skills.

Q2. What is the best way to remember important formulas in Class 9 Science?
Ans. Regular revision, making flashcards, practicing numerical problems, and writing down formulas repeatedly help in memorization.

Q3. Are there any changes in the Class 9 Science syllabus for 2025-26?
Ans. It’s best to check the latest syllabus on the CBSE official website, but generally, the syllabus remains consistent with minor updates.

Q4. Can I score full marks by only studying important questions?
Ans. Important questions cover key topics but understanding the whole syllabus is essential. Full marks require comprehensive preparation beyond just important questions.