CBSE Class 9 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 SI unit of force is:
a) Newton
b) Joule
c) Watt
d) Pascal
(1 mark) - Which of the following is a vector quantity?
a) Speed
b) Distance
c) Velocity
d) Work
(1 mark) - The value of acceleration due to gravity on Earth is approximately:
a) 9.8 m/s²
b) 8.9 m/s²
c) 10 m/s²
d) 7.8 m/s²
(1 mark) - What is the formula for kinetic energy?
(1 mark) - Sound travels fastest in:
a) Vacuum
b) Air
c) Water
d) Steel
(1 mark) - The work done is zero if the angle between force and displacement is:
(1 mark) - Name the device used to measure electric current.
(1 mark)
Q8-Q14: Chemistry (7 marks)
8. Which of the following is a compound?
a) Oxygen
b) Nitrogen
c) Water
d) Gold
(1 mark)
- The atomic number of an element is equal to the number of:
a) Protons
b) Electrons
c) Neutrons
d) Nucleons
(1 mark) - The chemical formula of sodium chloride is:
a) NaCl
b) Na₂CO₃
c) NaHCO₃
d) NaOH
(1 mark) - What is the boiling point of water at standard atmospheric pressure?
(1 mark) - The process of conversion of a liquid into a gas is called:
a) Sublimation
b) Evaporation
c) Condensation
d) Freezing
(1 mark) - Name the gas present in the largest amount in the atmosphere.
(1 mark) - The valency of carbon is:
(1 mark)
Q15-Q20: Biology (6 marks)
15. The basic structural and functional unit of life is:
a) Tissue
b) Cell
c) Organ
d) Organ system
(1 mark)
- Which of the following is a communicable disease?
a) Diabetes
b) Malaria
c) Hypertension
d) Cancer
(1 mark) - The process by which green plants make their food is called:
(1 mark) - Which tissue provides flexibility to plants?
a) Collenchyma
b) Sclerenchyma
c) Parenchyma
d) Xylem
(1 mark) - The causative agent of malaria is:
a) Virus
b) Bacteria
c) Protozoa
d) Fungi
(1 mark) - Name the scientist who discovered the cell.
(1 mark)
Section B: Short Answer Questions (18 Marks)
Answer each question in 60-80 words. Each question carries 3 marks.
Q21. Define motion. Explain the difference between uniform and non-uniform motion with examples. (3 marks)
Q22. What is an element? Differentiate between an atom and a molecule with examples. (3 marks)
Q23. Describe the structure of a plant cell with a labeled diagram. (3 marks)
Q24. Explain the factors affecting the rate of evaporation. (3 marks)
Q25. (Internal Choice)
a) Derive the second equation of motion: s = ut + ½ at².
OR
b) Explain the concept of work and energy with examples. (3 marks)
Q26. (Internal Choice)
a) What is crop rotation? Explain its advantages.
OR
b) Describe the role of vaccination in preventing diseases. (3 marks)
Section C: Long Answer Questions (30 Marks)
Answer each question in 100-120 words. Each question carries 5 marks.
Q27. State Newton’s three laws of motion with one example for each. (5 marks)
Q28. Explain the process of separation of substances using any three methods with examples. (5 marks)
Q29. Describe the structure and functions of the nucleus in a cell with a labeled diagram. (5 marks)
Q30. What is the difference between plant and animal tissues? Explain any two types of plant tissues and their functions. (5 marks)
Q31. (Internal Choice)
a) Derive the expression for the universal law of gravitation.
OR
b) Explain the working of a simple pendulum and factors affecting its time period. (5 marks)
Q32. (Internal Choice)
a) Discuss the importance of natural resources and their conservation.
OR
b) Explain the nitrogen cycle 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 verify the law of conservation of mass with a diagram. (3 marks)
Q34. Explain the procedure to determine the boiling point of water in the laboratory. (3 marks)
Q35. Describe the activity to observe the cells of an onion peel under a microscope with a labeled diagram. (3 marks)
Q36. Explain the experiment to demonstrate that sound needs a medium to travel. (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: a) Newton
- Q2: c) Velocity
- Q3: a) 9.8 m/s²
- Q4: KE = ½ mv²
- Q5: d) Steel
- Q6: 90°
- Q7: Ammeter
- Q8: c) Water
- Q9: a) Protons
- Q10: a) NaCl
- Q11: 100°C
- Q12: b) Evaporation
- Q13: Nitrogen
- Q14: 4
- Q15: b) Cell
- Q16: b) Malaria
- Q17: Photosynthesis
- Q18: a) Collenchyma
- Q19: c) Protozoa
- Q20: Robert Hooke
Section B: Short Answer Questions
- Q21: Motion: Change in position; Uniform motion (e.g., car at constant speed), non-uniform motion (e.g., accelerating car).
- Q22: Element: Pure substance; Atom (smallest unit, e.g., H), molecule (combined atoms, e.g., O₂).
- Q23: Plant cell: Cell wall, chloroplasts, large vacuole (diagram required).
- Q24: Evaporation factors: Temperature, surface area, wind speed.
- Q25a: Second equation: Derived using v = u + at and average velocity.
- Q25b: Work: Force × displacement; Energy: Ability to do work (e.g., kinetic energy).
- Q26a: Crop rotation: Growing different crops alternately; improves soil fertility.
- Q26b: Vaccination: Stimulates immunity, prevents diseases like polio.
Section C: Long Answer Questions
- Q27: Newton’s laws: First (inertia), Second (F = ma), Third (action-reaction) with examples.
- Q28: Separation: Filtration (sand-water), distillation (salt-water), chromatography (inks).
- Q29: Nucleus: Controls cell activities, contains DNA (diagram required).
- Q30: Plant tissues (e.g., xylem: water transport, phloem: food transport); animal tissues lack cell walls.
- Q31a: Gravitation: F = GMm/r² derived using masses and distance.
- Q31b: Pendulum: Oscillates; time period depends on length, gravity.
- Q32a: Resources: Water, forests; conservation: Sustainable use, recycling.
- Q32b: Nitrogen cycle: Fixation, assimilation, denitrification (diagram required).
Section D: Practical-Based Questions
- Q33: Conservation of mass: React sodium carbonate and hydrochloric acid, measure mass before/after.
- Q34: Boiling point: Heat water, note temperature when it boils steadily.
- Q35: Onion peel: Peel, stain, observe cells under microscope (diagram required).
- Q36: Sound: Use bell jar, remove air, observe sound reduction.
Notes for Students/Teachers:
- The question paper aligns with the CBSE Class 9 Science syllabus, covering Matter in Our Surroundings, Is Matter Around Us Pure, Atoms and Molecules, Motion, Force and Laws of Motion, Gravitation, Work and Energy, Sound, The Fundamental Unit of Life, Tissues, Diversity in Living Organisms, Why Do We Fall Ill, and Natural Resources.
- Practical-based questions test laboratory skills as per CBSE guidelines.
- Internal choices provide flexibility to students.
- The paper balances theoretical knowledge, numerical problems, and practical applications.
- Diagrams are mandatory where specified and should be neat and labeled.
- Ensure students practice numericals (e.g., equations of motion) and diagrams (e.g., cell structure, nitrogen cycle).
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