CBSE Class 8 Science Model Question Paper
Subject Code: 086
Time: 3 Hours
Maximum Marks: 80
General Instructions:
- The question paper is divided into four sections: A, B, C, and D.
- All questions are compulsory. However, internal choices are provided in some questions.
- Section A: Objective Type Questions (20 marks)
- Section B: Short Answer Questions (18 marks)
- Section C: Long Answer Questions (30 marks)
- Section D: Practical-Based Questions (12 marks)
- Answers should be written neatly and legibly.
- Draw well-labeled diagrams wherever necessary.
- Marks are indicated against each question.
Section A: Objective Type Questions (20 Marks)
This section contains 20 questions of 1 mark each. Choose the correct option or answer briefly as required.
Q1-Q7: Physics (7 marks)
- The push or pull on an object is called:
a) Pressure
b) Force
c) Friction
d) Energy
(1 mark) - Which of the following is a contact force?
a) Gravitational force
b) Magnetic force
c) Frictional force
d) Electrostatic force
(1 mark) - The SI unit of pressure is:
a) Newton
b) Pascal
c) Joule
d) Watt
(1 mark) - Name the instrument used to measure atmospheric pressure.
(1 mark) - Sound cannot travel through:
a) Air
b) Water
c) Vacuum
d) Metal
(1 mark) - The image formed by a plane mirror is:
a) Real and inverted
b) Virtual and erect
c) Real and erect
d) Virtual and inverted
(1 mark) - What is the charge of an electron?
(1 mark)
Q8-Q14: Chemistry (7 marks)
8. Which of the following is a synthetic fiber?
a) Cotton
b) Wool
c) Nylon
d) Silk
(1 mark)
- The process of burning a substance in the presence of oxygen is called:
a) Rusting
b) Combustion
c) Reduction
d) Oxidation
(1 mark) - Which gas is produced when metals react with acids?
a) Oxygen
b) Carbon dioxide
c) Hydrogen
d) Nitrogen
(1 mark) - Name the process used to separate kerosene and water.
(1 mark) - Which of the following is a non-metal?
a) Iron
b) Sulphur
c) Aluminium
d) Copper
(1 mark) - The chemical formula of water is:
(1 mark) - The flame produced when oxygen supply is sufficient is:
a) Yellow flame
b) Blue flame
c) Red flame
d) Green flame
(1 mark)
Q15-Q20: Biology (6 marks)
15. The process of conversion of sugar into alcohol is called:
a) Photosynthesis
b) Fermentation
c) Respiration
d) Digestion
(1 mark)
- Which part of the plant conducts water?
a) Xylem
b) Phloem
c) Stomata
d) Root hair
(1 mark) - The causative agent of cholera is:
a) Virus
b) Bacteria
c) Protozoa
d) Fungi
(1 mark) - Name the hormone responsible for growth in humans.
(1 mark) - The largest gland in the human body is:
a) Pancreas
b) Liver
c) Thyroid
d) Pituitary
(1 mark) - Which of the following is a Rabi crop?
a) Rice
b) Maize
c) Wheat
d) Cotton
(1 mark)
Section B: Short Answer Questions (18 Marks)
Answer each question in 60-80 words. Each question carries 3 marks.
Q21. Define force and explain its effects with examples. (3 marks)
Q22. What are synthetic fibers? Give two examples and their uses. (3 marks)
Q23. Describe the structure of a typical plant cell with a labeled diagram. (3 marks)
Q24. Explain the role of microorganisms in the environment. (3 marks)
Q25. (Internal Choice)
a) Explain the factors affecting the loudness of sound.
OR
b) Describe the working of an electroscope with a diagram. (3 marks)
Q26. (Internal Choice)
a) What is crop rotation? Explain its importance.
OR
b) Explain the process of nitrogen fixation in leguminous plants. (3 marks)
Section C: Long Answer Questions (30 Marks)
Answer each question in 100-120 words. Each question carries 5 marks.
Q27. Explain the types of friction and their applications in daily life with examples. (5 marks)
Q28. Describe the different zones of a flame with a labeled diagram. Explain the conditions required for combustion. (5 marks)
Q29. Discuss the process of reproduction in humans with a focus on the male and female reproductive systems. (5 marks)
Q30. What is adolescence? Explain the physical and emotional changes during adolescence. (5 marks)
Q31. (Internal Choice)
a) Explain the laws of reflection with a labeled diagram.
OR
b) Discuss the causes and effects of air pollution and suggest measures to control it. (5 marks)
Q32. (Internal Choice)
a) Describe the methods of irrigation used in agriculture and their advantages.
OR
b) Explain the process of photosynthesis with a labeled diagram. (5 marks)
Section D: Practical-Based Questions (12 Marks)
Answer each question in 60-80 words. Each question carries 3 marks.
Q33. Describe the experiment to show that air exerts pressure with a diagram. (3 marks)
Q34. Explain the procedure to test the presence of starch in a leaf. (3 marks)
Q35. Describe the activity to demonstrate the burning of magnesium ribbon and the nature of the product formed. (3 marks)
Q36. Explain the experiment to show that carbon dioxide is produced during respiration. (3 marks)
Marking Scheme (Suggested Answers)
Below is a brief marking scheme for guidance. Teachers/examiners can use this to evaluate answers.
Section A: Objective Type Questions
- Q1: b) Force
- Q2: c) Frictional force
- Q3: b) Pascal
- Q4: Barometer
- Q5: c) Vacuum
- Q6: b) Virtual and erect
- Q7: Negative
- Q8: c) Nylon
- Q9: b) Combustion
- Q10: c) Hydrogen
- Q11: Separating funnel
- Q12: b) Sulphur
- Q13: H₂O
- Q14: b) Blue flame
- Q15: b) Fermentation
- Q16: a) Xylem
- Q17: b) Bacteria
- Q18: Growth hormone
- Q19: b) Liver
- Q20: c) Wheat
Section B: Short Answer Questions
- Q21: Force: Push or pull; effects: Change in motion, shape (e.g., kicking a ball).
- Q22: Synthetic fibers: Man-made (e.g., nylon: ropes, polyester: clothes).
- Q23: Plant cell: Cell wall, chloroplasts, vacuole (diagram required).
- Q24: Microorganisms: Decompose waste, nitrogen fixation, food production.
- Q25a: Loudness: Depends on amplitude, distance from source.
- Q25b: Electroscope: Detects charge using metal leaves (diagram required).
- Q26a: Crop rotation: Alternating crops; improves soil fertility, reduces pests.
- Q26b: Nitrogen fixation: Bacteria in roots convert nitrogen to compounds.
Section C: Long Answer Questions
- Q27: Friction types: Static, sliding, rolling; applications: Brakes, walking.
- Q28: Flame zones: Innermost, middle, outer (diagram); combustion needs fuel, oxygen, ignition.
- Q29: Reproduction: Male (testes, sperm), female (ovaries, eggs); fertilization process.
- Q30: Adolescence: Transition to adulthood; physical (growth, puberty), emotional (mood swings).
- Q31a: Reflection laws: Angle of incidence equals angle of reflection, same plane (diagram).
- Q31b: Air pollution: Causes (vehicles, industries), effects (health issues); control: Afforestation, regulations.
- Q32a: Irrigation: Drip, sprinkler; saves water, improves yield.
- Q32b: Photosynthesis: Plants use sunlight, CO₂, water to produce glucose (diagram).
Section D: Practical-Based Questions
- Q33: Air pressure: Use a glass, water, and cardboard to show air holds water (diagram).
- Q34: Starch test: Boil leaf, decolorize with alcohol, add iodine (turns blue).
- Q35: Magnesium burning: Burns brightly, forms magnesium oxide (white ash).
- Q36: Respiration: Use lime water, exhaled air turns it milky (CO₂ presence).
Notes for Students/Teachers:
- The question paper aligns with the CBSE Class 8 Science syllabus, covering Crop Production and Management, Microorganisms: Friend and Foe, Synthetic Fibres and Plastics, Materials: Metals and Non-Metals, Coal and Petroleum, Combustion and Flame, Conservation of Plants and Animals, Cell Structure and Functions, Reproduction in Animals, Reaching the Age of Adolescence, Force and Pressure, Friction, Sound, Chemical Effects of Electric Current, Some Natural Phenomena, Light, Stars and the Solar System, and Pollution of Air and Water.
- Practical-based questions test laboratory skills as per CBSE guidelines.
- Internal choices provide flexibility to students.
- The paper balances theoretical knowledge, practical applications, and diagram-based questions.
- Diagrams are mandatory where specified and should be neat and labeled.
- Ensure students practice activities like starch tests, friction experiments, and diagram drawing (e.g., flame zones, plant cell).
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