Are you a Class 9 CBSE student who has already solved Set 1, Set 2, Set 3, and Set 4 of our Science papers? At Dhingra Classes, we believe that thorough practice with fresh questions builds unshakeable confidence. This is Question Paper Set 5 — featuring completely new questions with answers and zero duplicates from all 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 5)
| 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 is the smallest cell?
(a) Nerve cell
(b) PPLO (Mycoplasma)
(c) Red blood cell
(d) Egg cell
Answer: (b) PPLO (Mycoplasma)
Q2. The functional unit of a kidney is:
(a) Neuron
(b) Nephron
(c) Alveolus
(d) Villi
Answer: (b) Nephron
Q3. Which of the following organelles is involved in intracellular digestion?
(a) Lysosome
(b) Ribosome
(c) Mitochondria
(d) Plastid
Answer: (a) Lysosome
Q4. The lateral meristem is responsible for:
(a) Increase in length of the plant
(b) Increase in girth of the plant
(c) Formation of leaves
(d) Formation of flowers
Answer: (b) Increase in girth of the plant
Q5. Which of the following is a simple squamous epithelium found in?
(a) Skin
(b) Lungs (alveoli)
(c) Kidney tubules
(d) Intestine
Answer: (b) Lungs (alveoli)
Q6. The tendon connects:
(a) Bone to bone
(b) Muscle to bone
(c) Muscle to muscle
(d) Nerve to muscle
Answer: (b) Muscle to bone
Q7. Which of the following is not a function of the epidermis in plants?
(a) Protection against water loss
(b) Gas exchange
(c) Photosynthesis
(d) Protection against mechanical injury
Answer: (c) Photosynthesis
Q8. The matrix of blood is called:
(a) Plasma
(b) Serum
(c) Lymph
(d) Cytoplasm
Answer: (a) Plasma
Assertion-Reason Question (1 × 1 = 1 Mark)
Q9. Assertion (A): Mitochondria are called the powerhouse of the cell.
Reason (R): Mitochondria generate ATP through cellular respiration.
(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. Explain the difference between a nerve cell and a muscle cell with respect to their structure and function. (3 marks)
Answer:
| Feature | Nerve Cell (Neuron) | Muscle Cell |
|---|---|---|
| Shape | Long, branched with dendrites and axon | Elongated, spindle-shaped or cylindrical |
| Function | Conducts electrical impulses | Contracts and relaxes to produce movement |
| Special Feature | Contains dendrites and axon | Contains contractile proteins (actin and myosin) |
Q11. What are complex permanent tissues in plants? Name the two types and state their functions. (3 marks)
Answer: Complex permanent tissues are made up of more than one type of cells that work together to perform a common function.
The two types are:
1. Xylem:
Transports water and minerals from roots to other parts of the plant
Provides mechanical support
2. Phloem:
Transports food (sugars) from leaves to other parts of the plant
Transports food in both directions
Case Study Questions (2 × 4 = 8 Marks)
Q12. Read the passage and answer the questions below:
A student observed a plant tissue under a microscope. The cells were dead, had thick lignified walls, and no protoplasm. This tissue provided mechanical strength to the plant.
(a) Identify the tissue observed by the student. (1 mark)
Answer: Sclerenchyma
(b) Where is this tissue generally found in plants? (1 mark)
Answer: This tissue is found in the husk of coconut, nutshells, and stems of mature plants.
(c) What is the main function of this tissue? (1 mark)
Answer: It provides mechanical strength and rigidity to the plant.
(d) How does this tissue differ from parenchyma? (1 mark)
Answer: Sclerenchyma cells are dead with thick lignified walls, while parenchyma cells are living with thin cell walls and large intercellular spaces.
Q13. Read the passage and answer the questions below:
A student placed a potato strip in a concentrated sugar solution and observed it after 30 minutes. The potato strip had become flaccid and soft.
(a) What process caused the potato strip to become flaccid? (1 mark)
Answer: Exosmosis (movement of water out of the cell)
(b) Why did water move out of the potato cells? (1 mark)
Answer: Water moved out because the sugar solution was hypertonic (higher solute concentration) compared to the potato cell sap.
(c) What would happen if the potato strip is placed in pure water? (1 mark)
Answer: The potato strip would become turgid and firm because water would move into the cells through endosmosis.
(d) Define plasmolysis. (1 mark)
Answer: Plasmolysis is the process in which the cell membrane shrinks away from the cell wall due to loss of water from the cell when placed in a hypertonic solution.
Long Answer Question (1 × 5 = 5 Marks)
Q14. Explain the structure and functions of the endoplasmic reticulum (ER) . (5 marks)
Answer:
Structure:
The endoplasmic reticulum (ER) is a network of membrane-bound tubes and sheets.
It is of two types:
Rough ER (RER): Has ribosomes attached to its surface
Smooth ER (SER): Does not have ribosomes attached
Functions:
Rough ER: Synthesizes proteins and transports them to other parts of the cell.
Smooth ER: Synthesizes lipids and fats.
Detoxification: Smooth ER helps in detoxifying drugs and poisons.
Membrane biogenesis: ER helps in the synthesis of cell membrane.
Transport: It acts as a transport channel within the cell.
🧪 SECTION B: CHEMISTRY (25 Marks)
Multiple Choice Questions (7 × 1 = 7 Marks)
Q15. Which of the following is a heterogeneous mixture?
(a) Salt solution
(b) Sugar solution
(c) Oil and water
(d) Air
Answer: (c) Oil and water
Q16. The Tyndall effect is observed in:
(a) True solution
(b) Colloid
(c) Suspension
(d) Pure substance
Answer: (b) Colloid
Q17. Which of the following is a chemical change?
(a) Melting of ice
(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 five sets (Set 1 to Set 5) 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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