Class 8 Science: Sample Paper - 3 | 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 a good conductor of electricity?   (1 mark)
(a) Rubber
(b) Wood
(c) Copper
(d) Plastic

Q2. Separation of salt from seawater is done by:   (1 mark)
(a) Evaporation
(b) Sedimentation
(c) Filtration
(d) Decantation

Q3. The smallest unit of life is:   (1 mark)
(a) Organ
(b) Cell
(c) Tissue
(d) Organ system

Q4. Which property of sound determines its loudness?   (1 mark)
(a) Frequency
(b) Amplitude
(c) Speed
(d) Wavelength

Q5. Which gas is produced when zinc reacts with dilute hydrochloric acid?   (1 mark)
(a) Oxygen
(b) Carbon dioxide
(c) Hydrogen
(d) Methane

Q6. Which of the following is an abiotic component of the environment?   (1 mark)
(a) Plants
(b) Animals
(c) Soil
(d) Fungi

Q7. Which instrument is used to measure atmospheric pressure?   (1 mark)
(a) Hygrometer
(b) Thermometer
(c) Barometer
(d) Anemometer

Section – B

Q8. Write two properties of magnetic field lines.   (2 mark)

Q9. What is chlorophyll? Why is it important for plants?   (2 mark)

Q10. Differentiate between transparent and opaque objects with examples.   (2 mark)

Q11. Why do we see lightning before we hear thunder?   (2 mark)

Q12. State two harmful effects of acid rain.   (2 mark)

Q13. Give two methods of food preservation.   (2 mark)

Q14. Write two advantages of using CNG as fuel.   (2 mark)

Q15. Why do bridges have gaps left between sections?   (2 mark)

Q16. What is a habitat? Name two types.   (2 mark)

Section – C

Q17. Explain sublimation with an example and a labelled diagram.   (3 mark)

Q18. Why do we wear woollen clothes in winter?   (3 mark)

Q19. Explain how vaccination protects us from diseases.   (3 mark)

Q20. Draw a neat labelled diagram of the human respiratory system.   (3 mark)

Q21. What are asteroids and comets? State two differences.   (3 mark)

Q22. What are adaptations in plants? Explain with two examples.   (3 mark)

Q23. Describe the construction and working of an electric bell.   (3 mark)

Q24. Why is forest conservation important? Give two methods.   (3 mark)

Q25. What is electrolysis? Give one daily-life example.  (3 mark)

Q26. Explain the importance of reducing, reusing, and recycling.  (3 mark)

Section – D

Q27. (a) Define irrigation.  (5 mark)
(b) Explain two traditional methods of irrigation.
(c) Mention two drawbacks of traditional methods.

Q28. (a) What are contact and non-contact forces?  (5 mark)
(b) Explain magnetic force with an experiment.
(c) Mention one advantage and one disadvantage of friction.

Q29. (a) What is acid rain?  (5 mark)
(b) State three causes of acid rain.
(c) Mention two preventive measures.

Q30. (a) Define refraction of light.  (5 mark)
(b) State laws of refraction.
(c) Explain one daily-life example of refraction.

Q31. (a) What are microorganisms?  (5 mark)
(b) Write three useful and two harmful effects of microorganisms.
(c) Mention one method to prevent microbial spoilage of food.