Are you a Class 9 CBSE student looking for more practice after solving the first paper? At Dhingra Classes, we believe that consistent practice with fresh questions is the key to scoring high in Science. This is Question Paper Set 2 — completely new questions with answers, with no duplicates from our previous paper.
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 2)
| 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 a part of the prokaryotic cell?
(a) Cell membrane
(b) Ribosomes
(c) Nuclear membrane
(d) Cytoplasm
Answer: (c) Nuclear membrane
Q2. The process by which a cell engulfs food particles is called:
(a) Diffusion
(b) Osmosis
(c) Endocytosis
(d) Plasmolysis
Answer: (c) Endocytosis
Q3. Which plastid is responsible for the yellow and orange colour of flowers and fruits?
(a) Chloroplast
(b) Chromoplast
(c) Leucoplast
(d) Amyloplast
Answer: (b) Chromoplast
Q4. The tissue responsible for the transport of water in plants is:
(a) Phloem
(b) Xylem
(c) Cambium
(d) Epidermis
Answer: (b) Xylem
Q5. Which of the following is a simple permanent tissue?
(a) Xylem
(b) Phloem
(c) Parenchyma
(d) Cambium
Answer: (c) Parenchyma
Q6. The hard matrix of bone is made up of:
(a) Calcium and phosphorus
(b) Sodium and potassium
(c) Iron and copper
(d) Magnesium and zinc
Answer: (a) Calcium and phosphorus
Q7. Which of the following tissues is responsible for growth in length of a plant?
(a) Lateral meristem
(b) Intercalary meristem
(c) Apical meristem
(d) Permanent tissue
Answer: (c) Apical meristem
Q8. The striated muscles are also known as:
(a) Smooth muscles
(b) Cardiac muscles
(c) Skeletal muscles
(d) Involuntary muscles
Answer: (c) Skeletal muscles
Assertion-Reason Question (1 × 1 = 1 Mark)
Q9. Assertion (A): Cells of sclerenchyma are dead.
Reason (R): Sclerenchyma cells have thick lignin deposits on their cell walls.
(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 plasmolysis? Under what conditions does it occur? (3 marks)
Answer: Plasmolysis is the process in which the cell membrane shrinks away from the cell wall due to loss of water from the cell. It occurs when a plant cell is placed in a hypertonic solution (a solution with higher solute concentration than the cell sap). Water moves out of the cell through osmosis, causing the protoplasm to shrink.
Q11. Differentiate between Xylem and Phloem on the basis of their functions. (3 marks)
Answer:
| Xylem | Phloem |
|---|---|
| Transports water and minerals from roots to other parts of the plant | Transports food (sugars) from leaves to other parts of the plant |
| Transport occurs only in upward direction | Transport occurs in both directions |
| Composed of tracheids, vessels, xylem parenchyma, and xylem fibres | Composed of sieve tubes, companion cells, phloem parenchyma, and phloem fibres |
Case Study Questions (2 × 4 = 8 Marks)
Q12. Read the passage and answer the questions below:
A student placed a plant cell in a hypotonic solution (dilute salt solution) and observed it under a microscope. After some time, she noticed that the cell had swollen up but did not burst.
(a) Name the process responsible for the swelling of the cell. (1 mark)
Answer: Endosmosis (movement of water into the cell)
(b) Why did the plant cell not burst even after swelling? (1 mark)
Answer: The plant cell did not burst because it has a rigid cell wall outside the plasma membrane that withstands the osmotic pressure and prevents the cell from bursting.
(c) What would happen if an animal cell were placed in the same solution? (1 mark)
Answer: An animal cell would swell and eventually burst because it lacks a cell wall.
(d) Define osmosis. (1 mark)
Answer: Osmosis is the movement of water molecules from a region of higher concentration to a region of lower concentration through a selectively permeable membrane.
Q13. Read the passage and answer the questions below:
A student examines a slide of cardiac muscle under a microscope. She observes that the cells are cylindrical, branched, and striated. She also notices that the cells are uninucleate.
(a) Where is cardiac muscle found in the human body? (1 mark)
Answer: Cardiac muscle is found in the heart.
(b) Is cardiac muscle voluntary or involuntary? (1 mark)
Answer: Cardiac muscle is involuntary (we cannot control it consciously).
(c) Name two other types of muscle tissues found in the human body. (1 mark)
Answer: Skeletal muscles and smooth muscles
(d) What is the main function of cardiac muscle? (1 mark)
Answer: Cardiac muscle helps in the rhythmic contraction and relaxation of the heart, which pumps blood throughout the body.
Long Answer Question (1 × 5 = 5 Marks)
Q14. Explain the structure and functions of the plasma membrane. (5 marks)
Answer:
Structure:
The plasma membrane is the outermost covering of the cell.
It is flexible and made up of lipids and proteins.
It is a selectively permeable membrane, meaning it allows only certain substances to pass through it.
Functions:
Protects the cell from the external environment.
Controls the movement of substances in and out of the cell.
Allows diffusion of gases like oxygen and carbon dioxide.
Enables osmosis (movement of water).
Helps in endocytosis (engulfing food) and exocytosis (removing waste).
🧪 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) Sand and water
(d) Air
Answer: (c) Sand and water
Q16. The process of separating cream from milk is called:
(a) Filtration
(b) Centrifugation
(c) Distillation
(d) Sublimation
Answer: (b) Centrifugation
Q17. Which of the following is a physical change?
(a) Rusting of iron
(b) Burning of paper
(c) Melting of ice
(d) Cooking of food
Answer: (c) Melting of ice
Q18. The charge on an electron 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: (b) −1.6 × 10⁻¹⁹ C
Q19. Which shell has the highest energy in an atom?
(a) K-shell
(b) L-shell
(c) M-shell
(d) N-shell
Answer: (d) N-shell
Q20. The valency of an element with atomic number 12 is:
(a) 1
(b) 2
(c) 3
(d) 4
Answer: (b) 2
Q21. Which of the following is an example of a suspension?
(a) Milk
(b) Muddy water
(c) Sugar solution
(d) Air
Answer: (b) Muddy water
Assertion-Reason Question (1 × 1 = 1 Mark)
Q22. Assertion (A): Isotopes of an element have similar chemical properties.
Reason (R): Isotopes have the same number of electrons in their outermost shell.
(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 isotopes? Give one example. (2 marks)
Answer: Isotopes are atoms of the same element with the same atomic number but different mass numbers due to varying numbers of neutrons. Example: Carbon-12 (¹²C) and Carbon-14 (¹⁴C) — both have 6 protons, but Carbon-12 has 6 neutrons while Carbon-14 has 8 neutrons.
Short Answer Questions (2 × 3 = 6 Marks)
Q24. Differentiate between solutions, colloids, and suspensions. (3 marks)
Answer:
| Property | Solution | Colloid | Suspension |
|---|---|---|---|
| Particle size | Less than 1 nm | 1–1000 nm | More than 1000 nm |
| Visibility | Particles invisible | Particles visible under microscope | Particles visible to naked eye |
| Settling | Does not settle | Does not settle | Settles on standing |
Q25. Explain the distribution of electrons in different shells with an example. (3 marks)
Answer: Electrons revolve around the nucleus in fixed shells or orbits:
K-shell: Maximum 2 electrons
L-shell: Maximum 8 electrons
M-shell: Maximum 18 electrons
N-shell: Maximum 32 electrons
Example: Sodium (Na) has atomic number 11:
K-shell: 2 electrons
L-shell: 8 electrons
M-shell: 1 electron
Electronic configuration: 2, 8, 1
Case Study Question (1 × 4 = 4 Marks)
Q26. Read the passage and answer the questions below:
A student is given a mixture of iron filings, sand, and common salt. She wants to separate all three components.
(a) Which method will she use to separate iron filings? (1 mark)
Answer: Magnetic separation (using a magnet)
(b) After removing iron filings, how will she separate sand from salt? (1 mark)
Answer: She will add water to dissolve the salt, then use filtration to separate sand from the salt solution.
(c) How will she recover salt from the salt solution? (1 mark)
Answer: By evaporation of the salt solution.
(d) Which type of mixture is sand and salt before separation? (1 mark)
Answer: It is a heterogeneous mixture (specifically, a solid-solid mixture).
Long Answer Question (1 × 5 = 5 Marks)
Q27. Explain Rutherford’s model of the atom and its limitations. (5 marks)
Answer:
Rutherford’s Model:
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.
⚡ SECTION C: PHYSICS (27 Marks)
Multiple Choice Questions (2 × 1 = 2 Marks)
Q28. The slope of a distance-time graph gives:
(a) Acceleration
(b) Velocity
(c) Speed
(d) Displacement
Answer: (c) Speed
Q29. Which of the following is a non-contact force?
(a) Frictional force
(b) Muscular force
(c) Gravitational force
(d) Tension force
Answer: (c) Gravitational force
Assertion-Reason Question (1 × 1 = 1 Mark)
Q30. Assertion (A): A rocket moves forward by ejecting hot gases backward.
Reason (R): This is based on Newton’s Third Law of Motion.
(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 acceleration? Write its SI unit. (2 marks)
Answer: Acceleration is the rate of change of velocity with respect to time. It is a vector quantity.
Formula: a = (v − u) / t
SI Unit: m/s² (metre per second squared)
Q32. What is inertia? On what factor does it depend? (2 marks)
Answer: 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 — the greater the mass, the greater the inertia.
Q33. Define balanced forces. Give one example. (2 marks)
Answer: Balanced forces are equal in magnitude and opposite in direction, and their net resultant force is zero. They do not change the state of rest or motion of an object.
Example: A book lying on a table is acted upon by its weight (downward) and the normal force from the table (upward) — these are balanced forces.
Short Answer Questions (3 × 3 = 9 Marks)
Q34. Distinguish between speed and velocity. (3 marks)
Answer:
| Speed | Velocity |
|---|---|
| The rate of distance covered | The rate of displacement |
| Scalar quantity (magnitude only) | Vector quantity (magnitude and direction) |
| Always positive | Can be positive, negative, or zero |
Q35. A car accelerates uniformly from 18 km/h to 36 km/h in 5 seconds. Calculate:
(a) the acceleration
(b) the distance covered by the car in that time. (3 marks)
Answer:
Given:
Initial velocity, u = 18 km/h = 18 × (5/18) = 5 m/s
Final velocity, v = 36 km/h = 36 × (5/18) = 10 m/s
Time, t = 5 s
(a) Acceleration:
a = (v − u) / t = (10 − 5) / 5 = 5 / 5 = 1 m/s²
(b) Distance:
Using s = ut + ½at²:
s = 5 × 5 + ½ × 1 × (5)²
s = 25 + 12.5 = 37.5 m
Q36. State Newton’s Third Law of Motion. Explain how it applies when a person walks on the ground. (3 marks)
Answer: Newton’s Third Law: For every action, there is an equal and opposite reaction, and the two forces act on two different bodies simultaneously.
Application while walking:
When a person walks, they push the ground backward with their feet (action).
The ground pushes the person forward with an equal and opposite force (reaction).
This forward reaction force helps the person move forward.
Case Study Question (1 × 4 = 4 Marks)
Q37. Read the passage and answer the questions below:
A stone is dropped from the top of a building of height 80 m. It falls freely under gravity (take g = 10 m/s²).
(a) What is the initial velocity of the stone? (1 mark)
Answer: The initial velocity, u = 0 m/s (since the stone is dropped from rest).
(b) Calculate the time taken by the stone to reach the ground. (1 mark)
Answer: Using s = ut + ½gt²:
80 = 0 × t + ½ × 10 × t²
80 = 5t²
t² = 16
t = 4 seconds
(c) Calculate the final velocity of the stone just before hitting the ground. (1 mark)
Answer: Using v = u + gt:
v = 0 + 10 × 4 = 40 m/s
(d) What type of motion is exhibited by the freely falling stone? (1 mark)
Answer: The stone exhibits uniformly accelerated motion (with acceleration equal to g = 10 m/s²).
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 both Set 1 and Set 2 to cover all important concepts
Practice numericals from Motion and Force — they carry high weightage
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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