Are you a Class 9 CBSE student who has already solved Set 1, Set 2, and Set 3 of our Science papers? At Dhingra Classes, we believe that true mastery comes from solving fresh, varied questions. This is Question Paper Set 4 — featuring completely new 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 4)
| 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 not found in a plant cell?
(a) Chloroplast
(b) Centrosome
(c) Large vacuole
(d) Cell wall
Answer: (b) Centrosome
Q2. The kitchen of the cell is:
(a) Mitochondria
(b) Ribosome
(c) Chloroplast
(d) Golgi apparatus
Answer: (c) Chloroplast
Q3. Which of the following organelles helps in detoxification of drugs and poisons?
(a) Rough ER
(b) Smooth ER
(c) Lysosome
(d) Vacuole
Answer: (b) Smooth ER
Q4. The apical meristem is responsible for:
(a) Increase in girth of the plant
(b) Increase in length of the plant
(c) Formation of bark
(d) Storage of food
Answer: (b) Increase in length of the plant
Q5. Which of the following is a fluid connective tissue?
(a) Bone
(b) Cartilage
(c) Blood
(d) Adipose tissue
Answer: (c) Blood
Q6. The adipose tissue is a type of:
(a) Loose connective tissue
(b) Dense connective tissue
(c) Muscular tissue
(d) Nervous tissue
Answer: (a) Loose connective tissue
Q7. Which of the following is an example of aerenchyma?
(a) Leaf epidermis
(b) Stem of a rose plant
(c) Aquatic plant stem
(d) Root hair
Answer: (c) Aquatic plant stem
Q8. The neuron is the structural and functional unit of:
(a) Muscular tissue
(b) Nervous tissue
(c) Connective tissue
(d) Epithelial tissue
Answer: (b) Nervous tissue
Assertion-Reason Question (1 × 1 = 1 Mark)
Q9. Assertion (A): Ribosomes are called the protein factories of the cell.
Reason (R): Ribosomes are the sites of protein synthesis.
(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 striated, smooth, and cardiac muscles on the basis of their structure and function. (3 marks)
Answer:
| Feature | Striated Muscles | Smooth Muscles | Cardiac Muscles |
|---|---|---|---|
| Striations | Present | Absent | Present |
| Control | Voluntary | Involuntary | Involuntary |
| Location | Limbs, body wall | Stomach, intestine, blood vessels | Heart |
| Function | Movement of body parts | Movement of internal organs | Pumping of blood |
Q11. What is the role of the cell wall in plant cells? How does it differ from the cell membrane? (3 marks)
Answer:
Role of Cell Wall:
Provides structural strength and rigidity to the cell
Protects the cell from mechanical injury and pathogens
Prevents the cell from bursting when placed in a hypotonic solution
Difference from Cell Membrane:
| Cell Wall | Cell Membrane |
|---|---|
| Fully permeable | Selectively permeable |
| Made of cellulose | Made of lipids and proteins |
| Present only in plant cells | Present in both plant and animal cells |
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 had thickened corners due to pectin deposition. The tissue provided mechanical support to the growing parts of the plant.
(a) Identify the tissue observed by the student. (1 mark)
Answer: Collenchyma
(b) Where is this tissue generally found in plants? (1 mark)
Answer: This tissue is found in the leaf stalks (petioles) and young stems of plants.
(c) What is the main function of this tissue? (1 mark)
Answer: It provides mechanical support and flexibility to the growing parts of the plant.
(d) How does this tissue differ from sclerenchyma? (1 mark)
Answer: Collenchyma cells are living with irregularly thickened corners, while sclerenchyma cells are dead with uniformly thickened lignified walls.
Q13. Read the passage and answer the questions below:
A student placed a raisin in a bowl of water and observed it after 2 hours. The raisin had swollen up. She then placed another raisin in a concentrated salt solution and observed that it shrank.
(a) What process caused the raisin to swell in water? (1 mark)
Answer: Endosmosis (movement of water into the cell)
(b) What process caused the raisin to shrink in the salt solution? (1 mark)
Answer: Exosmosis (movement of water out of the cell)
(c) Why did the raisin swell in water? (1 mark)
Answer: The raisin swelled because water moved into the cells through the semi-permeable membrane due to osmosis (water concentration outside was higher than inside).
(d) What would happen if a raisin is placed in a hypertonic solution? (1 mark)
Answer: The raisin would shrink because water would move out of the cells.
Long Answer Question (1 × 5 = 5 Marks)
Q14. Explain the structure and functions of the Golgi apparatus. (5 marks)
Answer:
Structure:
The Golgi apparatus consists of a system of membrane-bound, flattened sacs called cisternae.
These are stacked parallel to each other.
It has a convex (cis) face and a concave (trans) face.
Functions:
Modification of proteins and lipids: It modifies proteins and lipids received from the ER.
Packaging and transport: It packages these substances into vesicles for transport to other parts of the cell.
Formation of lysosomes: It helps in the formation of lysosomes.
Secretion: It helps in the secretion of enzymes, hormones, and other substances.
Cell wall formation: In plant cells, it helps in the formation of the cell wall.
🧪 SECTION B: CHEMISTRY (25 Marks)
Multiple Choice Questions (7 × 1 = 7 Marks)
Q15. Which of the following is a physical change?
(a) Burning of magnesium ribbon
(b) Rusting of iron
(c) Dissolving sugar in water
(d) Cooking of rice
Answer: (c) Dissolving sugar in water
Q16. The particle size in a solution is:
(a) Less than 1 nm
(b) Between 1 nm and 1000 nm
(c) More than 1000 nm
(d) More than 1 cm
Answer: (a) Less than 1 nm
Q17. Which of the following is a metalloid?
(a) Sodium
(b) Silicon
(c) Chlorine
(d) Iron
Answer: (b) Silicon
Q18. The charge on a proton is:
(a) +1.6 × 10⁻¹⁹ C
(b) −1.6 × 10⁻¹⁹ C
(c) +1.6 × 10⁻¹⁹ N
(d) −1.6 × 10⁻¹⁹ N
Answer: (a) +1.6 × 10⁻¹⁹ C
Q19. The electronic configuration of an element with atomic number 19 is:
(a) 2, 8, 9
(b) 2, 8, 8, 1
(c) 2, 8, 1
(d) 2, 8, 8
Answer: (b) 2, 8, 8, 1 (Potassium: K = 19)
Q20. Which of the following is a compound?
(a) Air
(b) Brass
(c) Carbon dioxide
(d) Sea water
Answer: (c) Carbon dioxide
Q21. The process of sublimation is used to separate:
(a) Salt from water
(b) Camphor from sand
(c) Oil from water
(d) Cream from milk
Answer: (b) Camphor from sand
Assertion-Reason Question (1 × 1 = 1 Mark)
Q22. Assertion (A): Isotopes of an element have different physical properties.
Reason (R): Isotopes have different mass numbers.
(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 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 chromatography with an example. (3 marks)
Answer: Chromatography is a technique used to separate components of a mixture that are soluble in the same solvent. The mixture is spotted on a chromatography paper, and the paper is dipped in a solvent. The components travel up the paper at different rates based on their solubility, forming separate spots.
Example: Separation of dyes in black ink — different colours travel different distances and get separated.
Q25. State the postulates of Rutherford’s model of the atom and its limitations. (3 marks)
Answer:
Postulates:
The atom has a small, dense, positively charged nucleus at the center.
Electrons revolve around the nucleus in circular paths.
Most of the space in an atom is empty.
The nucleus is very small compared to the size of the atom.
Limitations:
It could not explain the stability of the atom. According to classical physics, a charged particle moving in a circular path should continuously emit energy and eventually fall into the nucleus.
It could not explain the arrangement of electrons in different shells.
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 slope of a velocity-time graph gives:
(a) Speed
(b) Displacement
(c) Acceleration
(d) Distance
Answer: (c) Acceleration
Q29. Which of the following is an example of gravitational force?
(a) A magnet attracting iron nails
(b) An apple falling from a tree
(c) A balloon rubbing against hair
(d) A person lifting a box
Answer: (b) An apple falling from a tree
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)
Long Answer Question (1 × 5 = 5 Marks)
Q38. (a) State Newton’s First Law of Motion.
(b) Explain the concept of inertia with two examples.
(c) Why do passengers fall forward when a moving bus stops suddenly? (5 marks)
Answer:
(a) Newton’s First Law:
An object remains in its state of rest or of uniform motion in a straight line unless acted upon by an external unbalanced force.
(b) Inertia:
Inertia is the natural tendency of an object to resist any change in its state of rest or uniform motion. It depends on the mass of the object.
Examples:
A book on a table remains at rest unless someone pushes it — this is inertia of rest.
A moving train cannot stop instantly because of inertia of motion.
(c) Passengers falling forward:
When a moving bus stops suddenly, the lower part of the passenger’s body comes to rest along with the bus. However, the upper part of the body tends to remain in motion due to inertia of motion. As a result, the passengers fall forward.
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🎯 Exam Tips for CBSE Class 9 Students
Solve all four sets (Set 1, Set 2, Set 3, and Set 4) 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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