CBSE Class 9 Science · Exam Practice

Science Practice Paper — Set 1

Science Practice Paper — Set 1. CBSE Class 9 Science, covering mixtures and separation, atoms, the cell, tissues, motion, force and Newton’s laws, work and energy, and sound, with a full answer key and worked solutions.

🎯 Full Marks: 50⏱️ Time: 1½ Hours📝 Questions: 30
SectionType of questionsQsMarks
AMultiple Choice Questions1010
BFill in the Blanks & True / False88
CShort Answer Questions816
DProblem Solving416
Total3050
Before you start
  • This paper samples across the CBSE Class 9 Science chapters on MuskMeadow: mixtures and separation, atoms, the cell, tissues, motion, force and Newton’s laws, work and energy, and sound.
  • Attempt the paper first, without looking at the answer key at the bottom of the page.
  • Show your working for Sections C and D — method marks are given even if the final answer is wrong.
  • This is a MuskMeadow practice paper. It is not an official CBSE paper and its mark scheme does not copy the board's exact pattern.
10 MARKS

Section A — Multiple Choice Questions

Choose the correct option. (1 mark each)

1. Common salt is recovered from its solution in water by

A. filtrationB. evaporationC. sublimationD. magnetic separation

2. The “powerhouse of the cell” is the

A. nucleusB. ribosomeC. mitochondrionD. Golgi apparatus

3. Which tissue carries water and minerals upward in a plant?

A. PhloemB. XylemC. ParenchymaD. Epidermis

4. A runner covers 150 m in 30 s. Her average speed is

A. 0.2 m/sB. 5 m/sC. 45 m/sD. 180 m/s

5. A 4 kg body has an acceleration of 3 m/s². The net force on it is

A. 0.75 NB. 7 NC. 12 ND. 1.33 N

6. The kinetic energy of a 2 kg body moving at 3 m/s is

A. 3 JB. 6 JC. 9 JD. 18 J

7. Sound of frequency above 20,000 Hz is called

A. infrasoundB. audible soundC. ultrasoundD. noise

8. A chlorine atom has atomic number 17 and mass number 35. Its number of neutrons is

A. 17B. 18C. 35D. 52

9. Which of the following is a pure substance?

A. AirB. BrassC. Distilled waterD. Milk

10. The inertia of a body depends on its

A. shapeB. massC. colourD. speed
8 MARKS

Section B — Fill in the Blanks & True / False

Fill in each blank, or write True / False. (1 mark each)

11. The ______ is the structural and functional unit of life.

12. The plant cell wall is mainly made of ______.

13. The nucleus controls the activities of the cell. (   )

14. The SI unit of work is the ______.

15. Sound can travel through a vacuum. (   )

16. Rutherford’s alpha-particle scattering experiment led to the discovery of the atomic ______.

17. Blood is a type of ______ tissue.

18. A solution is a homogeneous mixture. (   )

16 MARKS

Section C — Short Answer Questions

Show your working. (2 marks each)

19. Distinguish between a homogeneous and a heterogeneous mixture, with one example each.

20. An atom has atomic number 11 and mass number 23. Find its numbers of protons and neutrons.

21. State two functions of the cell membrane.

22. Find the work done when a force of 20 N moves a body 5 m along the direction of the force.

23. State Newton’s first law of motion.

24. A car starts from rest and reaches 20 m/s in 10 s. Find its acceleration.

25. What is the minimum distance from a reflecting surface at which an echo can be heard clearly? (Take speed of sound = 340 m/s and 0.1 s needed to distinguish the echo.)

26. Give two differences between a plant cell and an animal cell.

16 MARKS

Section D — Problem Solving

Show all steps. (4 marks each)

27. A car starts from rest and accelerates uniformly at 2 m/s² for 10 s, then moves at constant speed for the next 5 s. Find (a) the speed reached, (b) the total distance and (c) the average speed for the whole 15 s.

28. A force of 20 N acts on a 5 kg body at rest. Find (a) its acceleration, (b) its speed after 3 s and (c) its momentum after 3 s.

29. A 2 kg ball is dropped from a height of 5 m. (g = 10 m/s²) Find (a) its potential energy at the top, (b) its kinetic energy just before it hits the ground and (c) its speed at that instant.

30. A sound wave has frequency 500 Hz and wavelength 0.68 m. Find (a) its speed, (b) its time period and (c) the distance of lightning if its thunder is heard 4 s after the flash (use the speed from part (a); ignore the travel time of light).

CBSE Class 9 Science · Science Practice Paper — Set 1 · Answer Key

Answers & Worked Solutions

Check your paper, then read the solutions for the questions you missed.

Section A — Multiple Choice Questions (10 marks)
Q1. B. evaporation

Water evaporates and leaves the dissolved salt behind.

Q2. C. mitochondrion

Mitochondria release energy from food during respiration (ATP formation).

Q3. B. Xylem

Xylem conducts water and minerals from roots to leaves; phloem carries food.

Q4. B. 5 m/s

Speed = distance/time = 150/30 = 5 m/s.

Q5. C. 12 N

F = ma = 4 × 3 = 12 N.

Q6. C. 9 J

KE = ½mv² = ½ × 2 × 9 = 9 J.

Q7. C. ultrasound

Ultrasound has frequency above 20 kHz, beyond the range of human hearing.

Q8. B. 18

Neutrons = mass number − atomic number = 35 − 17 = 18.

Q9. C. Distilled water

Distilled water has a single fixed composition; the others are mixtures.

Q10. B. mass

Inertia is the resistance to change of motion and is measured by mass.

Section B — Fill in the Blanks & True / False (8 marks)
Q11. cell

All living organisms are made of cells.

Q12. cellulose

Cellulose gives the plant cell wall its rigidity.

Q13. True

It contains the chromosomes (DNA), which carry hereditary information.

Q14. joule

1 J = 1 N × 1 m.

Q15. False

Sound is a mechanical wave and needs a material medium.

Q16. nucleus

Most of the atom’s mass and all its positive charge lie in a tiny central nucleus.

Q17. connective

Blood connects and transports substances through the body.

Q18. True

Its composition is uniform throughout.

Section C — Short Answer Questions (16 marks)
Q19. Uniform vs non-uniform composition
  1. A homogeneous mixture has uniform composition throughout, e.g. salt dissolved in water.
  2. A heterogeneous mixture has non-uniform composition with visible parts, e.g. sand and water.
Q20. 11 protons, 12 neutrons
  1. Protons = atomic number = 11.
  2. Neutrons = 23 − 11 = 12.
Q21. Protection; controls entry and exit of substances
  1. It encloses the cell and gives it protection.
  2. It is selectively permeable, so it controls which substances enter and leave the cell.
Q22. 100 J
  1. Work = force × displacement in the direction of force.
  2. W = 20 × 5 = 100 J.
Q23. A body stays at rest or in uniform motion unless an external force acts
  1. A body continues in its state of rest or of uniform motion in a straight line unless an unbalanced external force acts on it.
  2. Example: passengers lurch forward when a moving bus brakes suddenly.
Q24. 2 m/s²
  1. a = (v − u)/t.
  2. a = (20 − 0)/10 = 2 m/s².
Q25. 17 m
  1. Sound must travel to the surface and back in 0.1 s: total distance = 340 × 0.1 = 34 m.
  2. Distance to the surface = 34/2 = 17 m.
Q26. Cell wall and large vacuole in plant cells
  1. Plant cells have a cell wall (outside the membrane); animal cells do not.
  2. Plant cells have a large central vacuole and plastids (chloroplasts); animal cells have small or no vacuoles and no plastids.
Section D — Problem Solving (16 marks)
Q27. (a) 20 m/s (b) 200 m (c) 13.3 m/s
  1. (a) v = u + at = 0 + 2 × 10 = 20 m/s.
  2. (b) Accelerating phase: s = ½at² = ½ × 2 × 100 = 100 m. Constant-speed phase: s = 20 × 5 = 100 m. Total = 200 m.
  3. (c) Average speed = 200/15 ≈ 13.3 m/s.
Q28. (a) 4 m/s² (b) 12 m/s (c) 60 kg·m/s
  1. (a) a = F/m = 20/5 = 4 m/s².
  2. (b) v = u + at = 0 + 4 × 3 = 12 m/s.
  3. (c) p = mv = 5 × 12 = 60 kg·m/s.
Q29. (a) 100 J (b) 100 J (c) 10 m/s
  1. (a) PE = mgh = 2 × 10 × 5 = 100 J.
  2. (b) By conservation of energy, all the PE becomes KE (ignoring air resistance): KE = 100 J.
  3. (c) ½mv² = 100 ⇒ v² = 100 ⇒ v = 10 m/s.
Q30. (a) 340 m/s (b) 0.002 s (c) 1360 m
  1. (a) v = fλ = 500 × 0.68 = 340 m/s.
  2. (b) T = 1/f = 1/500 = 0.002 s.
  3. (c) Distance = speed × time = 340 × 4 = 1360 m.
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