Are you a Class 9 CBSE student who has already solved Set 1 and Set 2? At Dhingra Classes, we believe that the more you practise, the sharper your concepts become. This is Question Paper Set 3 — featuring completely fresh questions with answers and zero duplicates from our previous papers.
This paper covers five crucial chapters: The Fundamental Unit of Life, Tissue, Is Matter Around Us Pure, Structure of Atom, and Motion and How Forces Affect Motion, strictly following the latest CBSE Class 9 exam pattern.
📋 CBSE Class 9 Science Exam Pattern — 80 Marks (Set 3)
| Subject Section | Chapters Covered | Marks |
|---|---|---|
| Biology | The Fundamental Unit of Life, Tissue | 28 |
| Chemistry | Is Matter Around Us Pure, Structure of Atom | 25 |
| Physics | Motion, How Forces Affect Motion | 27 |
Time Allowed: 3 Hours
Maximum Marks: 80
🔬 SECTION A: BIOLOGY (28 Marks)
Multiple Choice Questions (8 × 1 = 8 Marks)
Q1. Which of the following organelles is present only in plant cells and not in animal cells?
(a) Mitochondria
(b) Plastids
(c) Ribosomes
(d) Golgi apparatus
Answer: (b) Plastids
Q2. The movement of water molecules from a region of higher concentration to lower concentration through a semi-permeable membrane is called:
(a) Diffusion
(b) Osmosis
(c) Active transport
(d) Plasmolysis
Answer: (b) Osmosis
Q3. The longest cell in the human body is:
(a) Blood cell
(b) Nerve cell
(c) Muscle cell
(d) Bone cell
Answer: (b) Nerve cell
Q4. Which of the following is a complex permanent tissue?
(a) Parenchyma
(b) Collenchyma
(c) Phloem
(d) Epidermis
Answer: (c) Phloem
Q5. The intercalary meristem is found:
(a) At the tips of roots and shoots
(b) At the base of leaves and internodes
(c) On the sides of stems
(d) In the bark of trees
Answer: (b) At the base of leaves and internodes
Q6. The matrix of cartilage is made up of:
(a) Calcium and phosphorus
(b) Proteins and sugars
(c) Fats and oils
(d) Vitamins and minerals
Answer: (b) Proteins and sugars
Q7. Which of the following is an example of voluntary muscle?
(a) Muscles of the heart
(b) Muscles of the stomach
(c) Muscles of the arm
(d) Muscles of the intestine
Answer: (c) Muscles of the arm
Q8. The epidermis in plants is covered by a waxy layer called:
(a) Cuticle
(b) Stomata
(c) Cambium
(d) Periderm
Answer: (a) Cuticle
Assertion-Reason Question (1 × 1 = 1 Mark)
Q9. Assertion (A): The nucleus is called the control centre of the cell.
Reason (R): The nucleus contains DNA which carries hereditary information and controls all cell activities.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is NOT the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Answer: (a) Both A and R are true, and R is the correct explanation of A.
Short Answer Questions (2 × 3 = 6 Marks)
Q10. What is the difference between a plant cell and an animal cell with respect to the following: (3 marks)
(a) Cell wall
(b) Vacuole
(c) Centrosome
Answer:
| Feature | Plant Cell | Animal Cell |
|---|---|---|
| Cell wall | Present (rigid, made of cellulose) | Absent |
| Vacuole | One large central vacuole | Many small vacuoles or absent |
| Centrosome | Absent | Present |
Q11. Explain the functions of the epidermis in plants. (3 marks)
Answer: The epidermis is the outermost layer of cells in plants. Its functions include:
Protection: It protects the internal tissues from mechanical injury, water loss, and infection.
Gas exchange: It contains stomata (tiny pores) that allow the exchange of gases like carbon dioxide and oxygen.
Water regulation: The waxy cuticle on the epidermis reduces water loss through transpiration.
Case Study Questions (2 × 4 = 8 Marks)
Q12. Read the passage and answer the questions below:
A student was given three unknown slides of plant tissues. Slide A showed cells with thin cell walls and large intercellular spaces. Slide B showed cells with irregularly thickened corners. Slide C showed cells with thick lignified walls and no protoplasm.
(a) Identify the tissue in Slide A. (1 mark)
Answer: Parenchyma
(b) Identify the tissue in Slide B. (1 mark)
Answer: Collenchyma
(c) Identify the tissue in Slide C. (1 mark)
Answer: Sclerenchyma
(d) Which of these tissues provides mechanical support to the plant? (1 mark)
Answer: Sclerenchyma provides mechanical support (and Collenchyma also provides some support).
Q13. Read the passage and answer the questions below:
A student observed a cell under a microscope. She noticed a jelly-like substance containing various organelles. She also saw a network of tube-like structures near the nucleus. On closer inspection, she found small granular structures either floating freely or attached to the tubes.
(a) Name the jelly-like substance observed by the student. (1 mark)
Answer: Cytoplasm
(b) Identify the network of tube-like structures. (1 mark)
Answer: Endoplasmic Reticulum (ER)
(c) What are the small granular structures observed by the student? (1 mark)
Answer: Ribosomes
(d) What is the main function of these granular structures? (1 mark)
Answer: Ribosomes are the sites of protein synthesis in the cell.
Long Answer Question (1 × 5 = 5 Marks)
Q14. Explain the structure and functions of the cell membrane (plasma membrane). (5 marks)
Answer:
Structure:
The cell membrane is the outermost covering of the cell (in animal cells) and is present just inside the cell wall in plant cells.
It is flexible and made up of lipids and proteins.
It is a selectively permeable membrane — it allows only certain substances to enter and exit the cell.
Functions:
Protection: Protects the cell from the external environment.
Selective transport: Controls the movement of substances in and out of the cell.
Diffusion: Allows gases like oxygen and carbon dioxide to pass through.
Osmosis: Enables the movement of water molecules.
Endocytosis and Exocytosis: Helps in engulfing food particles and removing waste materials.
🧪 SECTION B: CHEMISTRY (25 Marks)
Multiple Choice Questions (7 × 1 = 7 Marks)
Q15. Which of the following is a pure substance?
(a) Air
(b) Brass
(c) Copper
(d) Sea water
Answer: (c) Copper
Q16. The process of separating dye from ink is called:
(a) Filtration
(b) Chromatography
(c) Distillation
(d) Sublimation
Answer: (b) Chromatography
Q17. Which of the following is a chemical change?
(a) Melting of wax
(b) Boiling of water
(c) Rusting of iron
(d) Breaking of glass
Answer: (c) Rusting of iron
Q18. The atomic number of an element is equal to the number of:
(a) Neutrons
(b) Protons
(c) Nucleons
(d) Electrons and neutrons
Answer: (b) Protons
Q19. Which of the following has the same number of neutrons as Carbon-12?
(a) Nitrogen-14
(b) Oxygen-16
(c) Boron-11
(d) Helium-4
Answer: (a) Nitrogen-14 (both have 7 neutrons: Carbon-12 has 6 protons, so 6 neutrons; Nitrogen-14 has 7 protons, so 7 neutrons)
Q20. The valency of an element with atomic number 17 is:
(a) 1
(b) 2
(c) 3
(d) 4
Answer: (a) 1 (Chlorine: electronic configuration 2, 8, 7 — needs 1 electron to complete its octet)
Q21. Which of the following is a metalloid?
(a) Sodium
(b) Silicon
(c) Chlorine
(d) Iron
Answer: (b) Silicon
Assertion-Reason Question (1 × 1 = 1 Mark)
Q22. Assertion (A): Milk is a colloid.
Reason (R): The particles in milk are large enough to be seen with the naked eye.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is NOT the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Answer: (c) A is true but R is false. (Milk is a colloid, but its particles are not visible to the naked eye — they can only be seen under a microscope.)
Very Short Answer Question (1 × 2 = 2 Marks)
Q23. What are valence electrons? How is the valency of an element determined? (2 marks)
Answer: Valence electrons are the electrons present in the outermost shell of an atom. The valency of an element is determined by the number of electrons gained, lost, or shared to achieve a stable electronic configuration (complete octet).
Short Answer Questions (2 × 3 = 6 Marks)
Q24. Explain the process of distillation with an example. (3 marks)
Answer: Distillation is a method used to separate a mixture of two miscible liquids with different boiling points. The mixture is heated in a distillation flask. The liquid with the lower boiling point evaporates first, and its vapours are condensed and collected separately.
Example: Separation of acetone (boiling point 56°C) and water (boiling point 100°C) .
Q25. What are the postulates of Bohr’s model of the atom? (3 marks)
Answer: Bohr’s Model Postulates:
Electrons revolve around the nucleus in fixed circular orbits called shells.
Each shell has a fixed energy, so these are also called energy levels.
Electrons do not radiate energy while revolving in these fixed orbits.
Energy is absorbed when an electron jumps to a higher orbit, and energy is emitted when it jumps to a lower orbit.
Case Study Question (1 × 4 = 4 Marks)
Q26. Read the passage and answer the questions below:
A student is given a mixture of common salt, sand, and water. She stirs the mixture well and then filters it. She collects the filtrate and evaporates it to obtain a solid residue.
(a) What is the filtrate obtained after filtration? (1 mark)
Answer: The filtrate is a salt solution (common salt dissolved in water).
(b) What is the residue left on the filter paper? (1 mark)
Answer: The residue is sand.
(c) What is the solid residue obtained after evaporation? (1 mark)
Answer: The solid residue is common salt.
(d) Name the technique used to separate salt from the salt solution. (1 mark)
Answer: Evaporation
Long Answer Question (1 × 5 = 5 Marks)
Q27. (a) What is the difference between a compound and a mixture?
(b) Explain four differences with examples. (5 marks)
Answer:
(a) Difference between Compound and Mixture:
| Property | Compound | Mixture |
|---|---|---|
| Composition | Elements combine in a fixed ratio by mass | Components are mixed in any ratio |
| Properties | Properties of the compound are different from its constituents | Properties of the mixture are similar to its constituents |
| Separation | Components cannot be separated by physical methods | Components can be separated by physical methods |
| Examples | Water (H₂O), Carbon dioxide (CO₂) | Air, Salt solution |
⚡ SECTION C: PHYSICS (27 Marks)
Multiple Choice Questions (2 × 1 = 2 Marks)
Q28. The area under a velocity-time graph gives:
(a) Acceleration
(b) Displacement
(c) Speed
(d) Force
Answer: (b) Displacement
Q29. Which of the following is an example of muscular force?
(a) A magnet attracting iron nails
(b) A person lifting a box
(c) An apple falling from a tree
(d) A balloon rubbing against hair
Answer: (b) A person lifting a box
Assertion-Reason Question (1 × 1 = 1 Mark)
Q30. Assertion (A): A body can have zero velocity but non-zero acceleration.
Reason (R): When a body is thrown vertically upward, at its highest point, its velocity is zero but acceleration due to gravity is non-zero.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is NOT the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Answer: (a) Both A and R are true, and R is the correct explanation of A.
Very Short Answer Questions (3 × 2 = 6 Marks)
Q31. What is uniform circular motion? Give one example. (2 marks)
Answer: Uniform circular motion is the motion of an object moving in a circular path with constant speed. Even though the speed is constant, the velocity changes continuously because the direction changes.
Example: The motion of the Moon around the Earth.
Q32. Define force. Write its SI unit and state whether it is a scalar or vector quantity. (2 marks)
Answer: Force is a push or pull that changes or tends to change the state of rest or uniform motion, direction of motion, or shape and size of a body.
SI Unit: Newton (N)
Force is a vector quantity (it has both magnitude and direction).
Q33. What is the law of conservation of momentum? (2 marks)
Answer: The law of conservation of momentum states that the total momentum of a system remains constant if no external unbalanced force acts on it. In other words, the total momentum before an interaction equals the total momentum after the interaction.
Short Answer Questions (3 × 3 = 9 Marks)
Q34. A body moves in a straight line and covers a distance of 40 m in 4 seconds and then 60 m in 6 seconds. Calculate its average speed. (3 marks)
Answer:
Given:
Total distance = 40 m + 60 m = 100 m
Total time = 4 s + 6 s = 10 s
Average speed = Total distance / Total time
= 100 / 10
= 10 m/s
Q35. State Newton’s Second Law of Motion. A force of 20 N acts on a body of mass 5 kg. Calculate the acceleration produced. (3 marks)
Answer:
Newton’s Second Law: The rate of change of momentum of an object is directly proportional to the applied force and takes place in the direction of the force.
Formula: F = ma
Given:
Force, F = 20 N
Mass, m = 5 kg
Acceleration:
a = F / m = 20 / 5 = 4 m/s²
Q36. Explain the difference between balanced and unbalanced forces. Give one example of each. (3 marks)
Answer:
| Balanced Forces | Unbalanced Forces |
|---|---|
| Equal in magnitude and opposite in direction | Unequal in magnitude or not opposite in direction |
| Net resultant force is zero | Net resultant force is non-zero |
| Do not change the state of rest or motion | Change the state of rest or motion |
Example of Balanced Forces: A book lying on a table (weight downward = normal force upward).
Example of Unbalanced Forces: A box being pushed across the floor (applied force > frictional force).
Case Study Question (1 × 4 = 4 Marks)
Q37. Read the passage and answer the questions below:
A car of mass 1200 kg is moving with a velocity of 15 m/s. The driver applies brakes and the car comes to rest in 3 seconds.
(a) Calculate the initial momentum of the car. (1 mark)
Answer: Initial momentum = m × u = 1200 × 15 = 18,000 kg m/s
(b) Calculate the change in momentum. (1 mark)
Answer: Change in momentum = Final momentum − Initial momentum
= (1200 × 0) − 18,000
= −18,000 kg m/s
(c) Calculate the force applied by the brakes. (1 mark)
Answer: Force = Change in momentum / Time
= −18,000 / 3
= −6,000 N
The negative sign indicates the force is applied opposite to the direction of motion.
(d) What is the SI unit of force? (1 mark)
Answer: Newton (N)
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🎯 Exam Tips for CBSE Class 9 Students
Solve all three sets (Set 1, Set 2, and Set 3) for complete coverage
Focus on numericals from Motion and Force — they are scoring
Draw neat, labelled diagrams for cell structure, tissue types, and atom models
Memorise chemical formulas and electronic configurations
Use real-life examples in your answers to score extra marks
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