CBSE Class 9 Science · Exam Practice

Science Practice Paper — Set 2

Science Practice Paper — Set 2. CBSE Class 9 Science, covering the atom, classification of living things, reproduction, the Earth’s atmosphere, motion, free fall and the cell, 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: the atom, classification of living things, reproduction, the Earth’s atmosphere, motion, free fall and the cell.
  • 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. Isotopes of an element have the same

A. mass numberB. number of neutronsC. atomic numberD. atomic mass

2. The maximum number of electrons that the third (M) shell can hold is

A. 2B. 8C. 18D. 32

3. Bacteria belong to the kingdom

A. PlantaeB. FungiC. MoneraD. Protista

4. Yeast reproduces asexually mainly by

A. fragmentationB. buddingC. spore formation onlyD. seed formation

5. The layer of the atmosphere in which we live and weather occurs is the

A. stratosphereB. mesosphereC. troposphereD. thermosphere

6. The formula mass of water (H = 1 u, O = 16 u) is

A. 16 uB. 17 uC. 18 uD. 20 u

7. The acceleration due to gravity near the Earth’s surface is about

A. 0.98 m/s²B. 9.8 m/s²C. 98 m/s²D. 1 m/s²

8. The cell organelle that contains digestive enzymes is the

A. lysosomeB. ribosomeC. Golgi bodyD. vacuole only

9. A straight, sloping line on a distance–time graph shows

A. restB. uniform speedC. uniform accelerationD. zero speed

10. The system of binomial nomenclature was introduced by

A. DarwinB. LinnaeusC. MendelD. Hooke
8 MARKS

Section B — Fill in the Blanks & True / False

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

11. The electron was discovered by ______.

12. Mitosis gives two genetically ______ daughter cells.

13. Nitrogen is the most abundant gas in the Earth’s atmosphere. (   )

14. The SI unit of acceleration is ______.

15. Isotopes of an element differ in their number of neutrons. (   )

16. The fusion of a male and a female gamete is called ______.

17. Mass and weight of a body mean the same thing. (   )

18. The muscle tissue of the heart is called ______ muscle.

16 MARKS

Section C — Short Answer Questions

Show your working. (2 marks each)

19. Define isotopes. Find the number of neutrons in chlorine-37 (atomic number 17).

20. Write the electron arrangement of magnesium (atomic number 12) and state its valency.

21. Find the formula mass of carbon dioxide (C = 12 u, O = 16 u).

22. A body moving at 5 m/s has an acceleration of 2 m/s² for 4 s. Find its final velocity.

23. Name the five kingdoms of classification.

24. Give one example each of binary fission and budding.

25. Find the weight of a 5 kg object on Earth. (g = 9.8 m/s²)

26. Name two greenhouse gases.

16 MARKS

Section D — Problem Solving

Show all steps. (4 marks each)

27. A car accelerates uniformly from rest to 20 m/s in 8 s and then brakes uniformly to rest in 5 s. Find (a) the acceleration, (b) the braking deceleration and (c) the total distance travelled.

28. Calcium has atomic number 20 and mass number 40. Find (a) the numbers of protons, neutrons and electrons, (b) its electron arrangement and (c) the number of electrons in the Ca²⁺ ion.

29. A stone is dropped from a cliff and takes 3 s to reach the ground. (g = 10 m/s²) Find (a) its speed on landing, (b) the height of the cliff and (c) the distance fallen in the first second.

30. Place each organism in its kingdom and give one identifying feature: Amoeba, mushroom, rose plant, frog.

CBSE Class 9 Science · Science Practice Paper — Set 2 · 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. C. atomic number

Isotopes have the same number of protons (atomic number) but different numbers of neutrons.

Q2. C. 18

A shell n can hold 2n² electrons: 2 × 3² = 18.

Q3. C. Monera

Bacteria are prokaryotes and belong to Monera.

Q4. B. budding

A small bud grows out of the yeast cell and separates.

Q5. C. troposphere

The troposphere is the lowest layer.

Q6. C. 18 u

2 × 1 + 16 = 18 u.

Q7. B. 9.8 m/s²

g ≈ 9.8 m/s² (taken as 10 m/s² in rough calculations).

Q8. A. lysosome

Lysosomes digest worn-out organelles and foreign material.

Q9. B. uniform speed

Constant slope means equal distances in equal times.

Q10. B. Linnaeus

Carl Linnaeus gave each organism a genus and species name.

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

Thomson’s cathode-ray experiments showed negatively charged particles.

Q12. identical

Each daughter cell has the same number of chromosomes as the parent.

Q13. True

About 78% of dry air is nitrogen.

Q14. m/s²

Change in velocity (m/s) per second.

Q15. True

Their mass numbers therefore differ.

Q16. fertilisation

It forms the zygote.

Q17. False

Mass is the amount of matter; weight = mg is a force.

Q18. cardiac

It is involuntary and never tires.

Section C — Short Answer Questions (16 marks)
Q19. 20 neutrons
  1. Isotopes are atoms of the same element with the same atomic number but different mass numbers.
  2. Neutrons = 37 − 17 = 20.
Q20. 2, 8, 2; valency 2
  1. Electron arrangement: K = 2, L = 8, M = 2.
  2. It loses 2 electrons to form Mg²⁺, so the valency is 2.
Q21. 44 u
  1. CO₂ has 1 carbon and 2 oxygen atoms.
  2. 12 + 2 × 16 = 44 u.
Q22. 13 m/s
  1. v = u + at.
  2. v = 5 + 2 × 4 = 13 m/s.
Q23. Monera, Protista, Fungi, Plantae, Animalia
  1. Whittaker’s five-kingdom classification.
  2. Monera, Protista, Fungi, Plantae and Animalia.
Q24. Amoeba; yeast (or Hydra)
  1. Binary fission: Amoeba divides into two equal cells.
  2. Budding: yeast or Hydra forms an outgrowth that detaches.
Q25. 49 N
  1. Weight = mass × g.
  2. 5 × 9.8 = 49 N.
Q26. Carbon dioxide and methane
  1. Greenhouse gases trap heat in the atmosphere.
  2. Examples: carbon dioxide (CO₂), methane (CH₄), water vapour.
Section D — Problem Solving (16 marks)
Q27. (a) 2.5 m/s² (b) 4 m/s² (c) 130 m
  1. (a) a = (20 − 0)/8 = 2.5 m/s².
  2. (b) Deceleration = 20/5 = 4 m/s².
  3. (c) Distance while speeding up = ½ × 2.5 × 8² = 80 m; while braking = (20 + 0)/2 × 5 = 50 m; total = 130 m.
Q28. (a) 20, 20, 20 (b) 2, 8, 8, 2 (c) 18
  1. (a) Protons = electrons = 20; neutrons = 40 − 20 = 20.
  2. (b) Electron arrangement: 2, 8, 8, 2.
  3. (c) Ca²⁺ has lost 2 electrons: 20 − 2 = 18.
Q29. (a) 30 m/s (b) 45 m (c) 5 m
  1. (a) v = gt = 10 × 3 = 30 m/s.
  2. (b) h = ½gt² = ½ × 10 × 9 = 45 m.
  3. (c) In 1 s: ½ × 10 × 1 = 5 m.
Q30. Protista, Fungi, Plantae, Animalia
  1. Amoeba — Protista: unicellular with a nucleus (eukaryote).
  2. Mushroom — Fungi: heterotrophic, with cell walls of chitin, absorbs food.
  3. Rose plant — Plantae: multicellular, has chlorophyll and makes its own food.
  4. Frog — Animalia: multicellular, no cell wall, depends on other organisms for food.
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