Top Important Questions for Class 8 (P.C.B)
If you want to score high and build strong concepts, these Class 8 Science Important Questions are exactly what you need. This article provides NCERT-based, concept-driven questions with clear explanations from Physics, Chemistry, and Biology. These Class 8 Science Important Questions are designed to help you understand topics deeply and prepare effectively for exams.
Unlike simple question lists, this guide ensures that every answer is explained in an easy and logical way, so you don’t just memorize—you actually understand. Practicing these Class 8 Science Important Questions regularly will improve your accuracy, confidence, and exam performance.
Why These Class 8 Science Important Questions Matter
Class 8 is a crucial stage where concepts start becoming slightly advanced. These Class 8 Science Important Questions focus on strengthening fundamentals, which are important for Class 9, 10, and even competitive exams later. Understanding these questions will make future learning much easier.
Physics Important Questions (Class 8)
1. What is force? Explain with examples.
Force is a push or pull acting on an object. It can change the shape, direction, or speed of an object. For example, pushing a door to open it or kicking a football both involve force.
2. What are contact and non-contact forces?
Contact forces act when objects touch each other, such as friction. Non-contact forces act without physical contact, like gravity and magnetic force.
3. What is pressure?
Pressure is the force applied per unit area. It increases when the same force is applied over a smaller area.
4. What is friction and why is it useful?
Friction is a force that opposes motion between surfaces. It is useful because it helps us walk, write, and stop vehicles, although too much friction can cause wear and tear.
5. What is sound and how is it produced?
Sound is a form of energy produced by vibrations. When an object vibrates, it creates sound waves that travel through a medium.
6. What is light?
Light is a form of energy that enables us to see objects. It travels in a straight line.
7. What are reflection and refraction?
Reflection is the bouncing back of light from a surface, while refraction is the bending of light when it passes from one medium to another.
8. What is electricity?
Electricity is the flow of electric charge. It is used to power devices like bulbs and fans.
9. What are conductors and insulators?
Conductors allow electricity to pass through them (like copper), while insulators do not (like rubber).
10. What is energy?
Energy is the ability to do work. It exists in many forms such as heat, light, and electrical energy.
Chemistry Important Questions (Class 8)
11. What is matter?
Matter is anything that has mass and occupies space. It can exist in solid, liquid, or gas forms.
12. What are metals and non-metals?
Metals are shiny, hard, and good conductors of heat and electricity. Non-metals are usually dull and poor conductors.
13. What are physical and chemical changes?
A physical change does not create a new substance, while a chemical change results in a new substance with different properties.
14. What is combustion?
Combustion is a chemical process in which a substance burns in oxygen to produce heat and light.
15. What are fuels?
Fuels are substances that produce energy when burned, such as coal, petrol, and LPG.
16. What is pollution?
Pollution is the contamination of air, water, or soil that harms living organisms.
17. What is a chemical reaction?
A chemical reaction is a process where substances change into new substances.
18. What is corrosion?
Corrosion is the gradual destruction of metals due to reactions with the environment, like rusting of iron.
19. What is conservation of resources?
It means using resources wisely to prevent depletion.
20. What is synthetic fibre?
Synthetic fibres are man-made fibres such as nylon and polyester.
Biology Important Questions (Class 8)
21. What are microorganisms?
Microorganisms are tiny living organisms that cannot be seen with the naked eye, like bacteria and fungi.
22. What are useful and harmful microorganisms?
Some microorganisms help in making food and medicines, while others cause diseases.
23. What is crop production?
Crop production involves growing plants for food using proper farming techniques.
24. What is photosynthesis?
Photosynthesis is the process by which green plants prepare food using sunlight, carbon dioxide, and water.
25. What is reproduction?
Reproduction is the process by which living organisms produce new individuals.
26. What is adolescence?
Adolescence is the stage of life when the body undergoes changes and develops into an adult.
27. What is the endocrine system?
It is a system of glands that release hormones to control body functions.
28. What is cell structure?
A cell is the basic unit of life containing organelles that perform different functions.
29. What is ecosystem?
An ecosystem is a system where living organisms interact with each other and their environment.
30. What is biodiversity?
Biodiversity refers to the variety of living organisms in a particular area.
How to Use These Class 8 Science Important Questions
To get maximum benefit, practice these Class 8 Science Important Questions regularly. Focus on understanding the concepts rather than memorizing answers. Try writing answers in your own words and revise consistently.
Final Revision Strategy
Revise these Class 8 Science Important Questions at least 2–3 times before exams. Focus on weak topics and test yourself without looking at answers. This will improve retention and boost confidence.
FAQ – Class 8 Science Important Questions
Q1. Are these Class 8 Science Important Questions enough for exams?
Yes, these cover the most important NCERT-based concepts.
Q2. Are these questions based on NCERT?
Yes, all questions follow NCERT syllabus and exam patterns.
Q3. How should I prepare using these questions?
Understand concepts first, then practice regularly.
Q4. Are these helpful for higher classes?
Yes, these concepts are important for Class 9 and 10.
Q5. Can I score high marks using these?
Yes, with proper understanding and revision, scoring high becomes easier.