Class 8 Science: Sample Paper - 4 | Sample Papers For Class 8 PDF Download

Time: 3 hrs
Total Marks: 80

General Instructions

This question paper consists of 31 questions in total and all questions are compulsory.

• Questions 1-7 are multiple-choice questions and each carries 1 mark. Write the correct answer in your answer sheet.
• Questions 8-16 are very short-answer questions and carry 2 marks each.
• Questions 17-26 are short-answer questions and carry 3 marks each.
• Questions 27-31 are long-answer questions and each carries 5 marks.

Section - A

Q1. Which of the following is used to kill harmful microorganisms in water?    (1 mark)
(a) Chlorine
(b) Oxygen
(c) Nitrogen
(d) Carbon dioxide

Q2. Which of these is NOT a physical change?    (1 mark)
(a) Melting of ice
(b) Dissolving sugar in water
(c) Rusting of iron
(d) Breaking of glass

Q3. Which organelle is known as the “powerhouse of the cell”?    (1 mark)
(a) Chloroplast
(b) Nucleus
(c) Mitochondria
(d) Ribosome

Q4. Which of the following travels fastest?    (1 mark)
(a) Light in air
(b) Sound in air
(c) Sound in water
(d) Sound in steel

Q5. Which of the following is a fossil fuel?    (1 mark)
(a) Biogas
(b) Petrol
(c) Solar energy
(d) Wind energy

Q6. Which one is an example of a physical adaptation?    (1 mark)
(a) Long neck of a giraffe
(b) Hunting in groups by lions
(c) Birds migrating
(d) Learning to ride a bicycle

Q7. Which device converts chemical energy into electrical energy?    (1 mark)
(a) Bulb
(b) Battery
(c) Generator
(d) Fan

Section - B

Q8. What is potable water? Name one method to make water potable.    (2 mark)

Q9. Write two differences between arteries and veins.    (2 mark)

Q10. Why do we apply paint on iron articles?    (2 mark)

Q11. What is a galaxy? Name one.    (2 mark)

Q12. Write two uses of concave mirrors.    (2 mark)

Q13. State two harmful effects of plastics on the environment.    (2 mark)

Q14. Why does a needle sink in water but a ship floats?    (2 mark)

Q15. Name two communicable diseases and their mode of transmission.    (2 mark)

Q16. What is meant by balance in nature?    (2 mark)

Section - C

Q17. Explain crystallisation with an example.    (3 mark)

Q18. Why are solar cookers painted black from inside and covered with a glass plate?   (3 mark)

Q19. Write differences between aerobic and anaerobic respiration.   (3 mark)

Q20. Explain the role of platelets in blood clotting.   (3 mark)

Q21. Define renewable and non-renewable resources with two examples each.   (3 mark)

Q22. Explain adaptations in aquatic animals with examples.   (3 mark)

Q23. How is lightning produced? Mention two safety measures during a thunderstorm.   (3 mark)

Q24. What is deforestation? Write three effects of deforestation.   (3 mark)

Q25. Explain how coal and petroleum are formed.   (3 mark)

Q26. Write three methods of water conservation.   (3 mark)

Section - D

Q27. (a) Define sericulture. (5 mark)
(b) Explain the life cycle of a silkworm with a diagram.
(c) State two uses of silk.

Q28. (a) What is sound pollution?   (5 mark)
(b) Mention three causes and three harmful effects of sound pollution.
(c) Suggest two preventive measures.

Q29. (a) What are fossils? (5 mark)
(b) How are they formed?
(c) Mention two uses of fossils for scientists.

Q30. (a) Define photosynthesis.   (5 mark)
(b) Write its word equation.
(c) Explain how stomata help in photosynthesis.

Q31. (a) What is force? (5 mark)
(b) Explain effects of force with examples.
(c) State differences between balanced and unbalanced forces.