Science Question paper Class 8
ANNUAL EXAMINATION (2025-26)
Subject: Science Class: 8
Time: 3 Hours Max. Marks: 70
General Instructions:
All questions are compulsory.
The question paper consists of four sections: A, B, C, and D.
Section A: 10 MCQs (1 mark each).
Section B: 10 Questions (2 marks each).
Section C: 5 Questions (3 marks each).
Section D: 5 Questions (5 marks each).
SECTION A (10 × 1 = 10 Marks)
Choose the correct option for each question.
1. Which of the following is a liquid metal at room temperature?
a) Iron b) Bromine c) Mercury d) Sodium
2. The process of loosening and turning the soil is called:
a) Sowing b) Tilling c) Harvesting d) Irrigation
3. Pathogenic microorganisms are present in:
a) Water b) Air c) Food d) All of these
4. Rayon is different from synthetic fibers because:
a) It has a silk-like appearance b) It is obtained from wood pulp c) Its fibers can also be woven like natural fibers
5. Which of the following cannot be recycled?
a) Plastic toys b) Cooker handles c) Plastic bags d) Plastic bowls
6. Phosphorus is kept in:
a) Kerosene b) Alcohol c) Water d) Air
7. The loudness of sound depends on:
a) Amplitude b) Frequency c) Speed d) Pitch
8. A cell wall is found only in:
a) Animal cells b) Plant cells c) Red blood cells d) Nerve cells
9. The friction between two surfaces increases if:
a) Surfaces are made smooth b) Surfaces are pressed harder c) Air is pumped between them
10. Which of the following is a non-contact force?
a) Friction b) Muscular force c) Magnetic force d) Tension
SECTION B (10 × 2 = 20 Marks)
Answer the following in 20-30 words each.
11. Define 'Nitrogen Fixation'.
12. Why are plastic containers favored for storing food?
13. Explain why some fibers are called 'synthetic'.
14. Give two examples of 'Contact Forces'.
15. What is 'Noise Pollution'? Mention one harmful effect.
16. Differentiate between 'Fertilizers' and 'Manure' (any two points).
17. Define 'Pressure'. Write its SI unit.
18. Why is the friction caused by fluids called 'drag'?
19. Name the cell organelle known as the "Powerhouse of the cell" and explain why.
20. Why are bells made of metals?
SECTION C (5 × 3 = 15 Marks)
Answer the following in 40-50 words each.
21. Explain why a wide strap is used in school bags instead of a thin string.
22. Describe the importance of 'Earthing' in buildings.
23. What are 'Antibiotics'? State two precautions to be taken while taking them.
24. List three differences between an Animal Cell and a Plant Cell.
25. Describe an experiment to show that sound cannot travel through a vacuum.
SECTION D (5 × 5 = 25 Marks)
Answer the following in detail. Use diagrams where necessary.
26. Explain the process of 'Electrolysis of Water'.
27. Why is a layer of Zinc coated over Iron pipes?
28. Define 'Friction'. Explain three methods to increase friction and two methods to reduce it in daily machinery.
29. Draw a well-labeled diagram of the Human Eye and explain the function of the Retina and the Lens.
(a) What is 'Combustion'?
(b) Describe the three different zones of a candle flame with a labeled diagram.
30. Explain the "Greenhouse Effect." How does it contribute to Global Warming, and what are the potential consequences?
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