Class 9 Science Annual Exam (2024-25) – ENGLISH MEDIUM

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Class 9 Science Annual Exam (2024-25) – ENGLISH MEDIUM

SECTION – A: Multiple Choice Questions (1 Mark Each)

1. Sublimation is said to occur when the change in state of a substance occurs directly from:
Answer: (C) solid to gas
Reason: Sublimation is the transition of a substance directly from the solid to the gas state.
2. Identify the mixture among the following that will show Tyndall effect:
Answer: (B) water and milk
Reason: Milk is a colloid, and colloids scatter a beam of light passing through them (Tyndall effect).
3. Which is the correct electronic configuration of Magnesium?
Answer: (C) 2, 8, 2
Reason: Magnesium has an atomic number of 12.
4. Cells (in biology) were first discovered by:
Answer: (B) Robert Hooke
5. When the slide of human cheek cell is prepared… a darkly coloured, spherical… dot like structure… Identify the correct organelle:
Answer: (D) Nucleus
6. If the medium has a lower concentration of water than the cell… Such a solution is known as:
Answer: (A) hypertonic solution
Reason: In a hypertonic solution, water moves out of the cell causing it to shrink.
7. Which meristem is present in the growing tips of stems and roots?
Answer: (D) Apical meristem
8. In an automobile the distance covered is displayed on the:
Answer: (C) odometer
9. …on stopping the suitcase will fall due to inertia towards:
Answer: (C) front side
Reason: Due to inertia of motion, the suitcase tries to continue moving forward when the bus stops.
10. Pick the correct expression to find power:
Answer: (B) P = W/t
11. Sakshi climbs stairs… (m=40kg, h=8m, g=10m/s²). Potential energy is:
Answer: (D) 3200J
Calculation: PE = m × g × h = 40 × 10 × 8 = 3200 J.
12. The characteristic of sound that decides its loudness is:
Answer: (A) amplitude
13. Medical instrument… for listening to the sounds produced by the heart or lungs:
Answer: (C) Stethoscope
14. Which of the following fish species is a surface feeder…?
Answer: (B) Catla
15. Among the following statements which one is not desirable for bee-keeping?
Answer: (D) Bees sting more and go to different pasturages.
16. Which agronomic characteristics are considered good for the fodder crops?
Answer: (C) tallness and profuse branching
17. Assertion (A): Smell of hot cooked food… Reason (R): Gases diffuse very fast…
Answer: (A) Both A and R are true, and R is the correct explanation of A.
18. Assertion (A): Stomata are small pores… Reason (R): Stomata help in gaseous exchange…
Answer: (A) Both A and R are true, and R is the correct explanation of A.
19. Assertion (A): Net force zero… balanced forces. Reason (R): Unbalanced forces… cause acceleration.
Answer: (B) Both A and R are true, and R is not the correct explanation of A.
Reason: Both statements are correct facts, but R defines unbalanced forces while A defines balanced forces; R does not explain A.
20. Assertion (A): Work done by gravity on satellite is zero. Reason (R): Satellite shifts orbit to moon.
Answer: (C) A is true but R is false.
Reason: Gravity acts perpendicular to displacement, so Work = 0 (True). Satellites do not automatically shift orbits to the moon (False).

SECTION – B: Very Short Answer Questions (2 Marks)

21. (A) Define latent heat of vaporisation. Among boiling water and steam, which one has more latent heat of vaporisation?

Definition: The amount of heat energy required to change 1 kg of a liquid into gas at its boiling point at atmospheric pressure is called latent heat of vaporisation.

More Energy: Steam has more energy than boiling water at the same temperature.

OR
21. (B) Which factors are responsible for increase in rate of evaporation? (Write any two factors)
  • Increase in surface area: Evaporation is a surface phenomenon.
  • Increase in temperature: More particles get enough kinetic energy to vaporize.
22. Draw schematic pictures of the three states of matter.

Answer:

  • Solid: Particles tightly packed in a regular pattern.
  • Liquid: Particles loosely packed with some spaces.
  • Gas: Particles far apart moving randomly.

(For visually impaired students) Answer: Change in Temperature and change in Pressure.

23. List the components that form solute and solvent among the given solutions:
  • (i) Soda water: Solute = Carbon dioxide (CO2); Solvent = Water.
  • (ii) Tincture of iodine: Solute = Iodine; Solvent = Alcohol.
24. (A) Name any two organelles besides nucleus that have their own genetic material… They synthesize their own proteins too. How?

Organelles: (1) Mitochondria (2) Plastids (Chloroplasts).

How: They contain their own DNA and Ribosomes, which allows them to manufacture some of their own proteins.

OR
24. (B) How are plant cells different from animal cells? Give any two differences.
  • Cell Wall: Present in plant cells; absent in animal cells.
  • Chloroplasts: Present in plant cells; absent in animal cells.
  • Vacuoles: Plant cells have large central vacuoles; animal cells have very small or temporary vacuoles.
25. State the universal law of gravitation. Give its Mathematical expression.

Law: Every object in the universe attracts every other object with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.

Expression: F = G × (M × m) / d²

26. Explain the law of conservation of energy by using an oscillating simple pendulum bob.

At the extreme positions, the bob has maximum Potential Energy (PE) and zero Kinetic Energy (KE). As it moves toward the center (mean position), PE converts into KE. At the center, KE is maximum. The sum of PE + KE remains constant at all points, verifying the law of conservation of energy.

SECTION – C: Short Answer Questions (3 Marks)

27. Classify the following into physical and chemical changes:
  • Physical Changes: Freezing of water, Melting of wax, Folding of paper.
  • Chemical Changes: Digestion of food, Rusting of iron, Burning of paper.
28. Calculate the molecular mass of K2CO3 and CO2:
  • (i) K2CO3: (39 × 2) + 12 + (16 × 3) = 78 + 12 + 48 = 138 u.
  • (ii) CO2: 12 + (16 × 2) = 12 + 32 = 44 u.
29. List any three differences between prokaryotic and eukaryotic cells.
  1. Nucleus: Prokaryotes lack a well-defined nuclear membrane (nucleoid); Eukaryotes have a well-defined nucleus.
  2. Size: Prokaryotes are generally smaller (1-10 μm); Eukaryotes are larger (5-100 μm).
  3. Organelles: Membrane-bound organelles (like mitochondria) are absent in Prokaryotes but present in Eukaryotes.
30. Compare the three types of muscular tissues on the basis of shape and number of nuclei:
  1. Striated (Skeletal): Cylindrical, unbranched, Multinucleate.
  2. Smooth: Spindle-shaped, Uninucleate.
  3. Cardiac: Cylindrical, branched, Uninucleate.
31. State the third law of motion. Analyse any one example…

Law: To every action, there is always an equal and opposite reaction.

Example (Walking): We push the ground backward with our feet (Action). The ground pushes us forward with an equal force (Reaction), which allows us to move forward.

32. (A) Share any three applications of Archimedes principle.
  1. Designing ships and submarines.
  2. Lactometers (used to test milk purity).
  3. Hydrometers (used to measure density of liquids).
OR
32. (B) Why does iron nail sink while a cork floats on the surface of water?

This happens due to density. The iron nail has a density higher than water, so the upthrust is less than its weight (sinks). Cork has a density lower than water, so the upthrust is greater than its weight (floats).

33. How are manure and fertilizers… different? Why is it advised to take up organic farming?

Difference: Manure is natural (organic decomposition) and adds humus. Fertilizers are inorganic chemicals made in factories and provide specific nutrients (N, P, K).

Organic Farming: It is advised because it avoids the use of harmful chemicals, protects soil fertility, and prevents water pollution.

SECTION – D: Long Answer Questions (5 Marks)

34. (A) Srija and the stone question
  • (i) Distance covered in 5 rounds:
    Radius (r) = 84 cm.
    Circumference = 2πr = 2 × (22/7) × 84 = 528 cm.
    Distance = 5 × 528 = 2640 cm or 26.4 meters.
  • (ii) Direction: The stone will fly off along the tangent to the circular path at that point.
  • (iii) Displacement: After one complete round, the stone returns to the start point, so displacement is Zero.
OR
34. (B) Velocity-time graph and Inference
  • (i) Velocity-time graph: The points will form a straight line sloping upwards from the origin.
  • (ii) Inference: The straight line indicates that the vehicle is moving with Uniform Acceleration.

(For visually impaired) (i) Speed is scalar, Velocity is vector. (ii) Avg Speed = Total Dist (1150m) / Total Time (600s) = 1.916 m/s.

35. (A) Isotopes and Atoms
  • (i) Isotopes vs Isobars: Isotopes: Same element, different mass (e.g., C-12, C-14). Isobars: Different elements, same mass (e.g., Ca and Ar).
  • (ii) Medical Application: An isotope of Cobalt (Co-60) is used in the treatment of cancer.
  • (iii) Electrons and Valency: If K, L, M shells are full, Total electrons = 28. Since the outermost shell is full, the Valency is Zero.
OR
35. (B) Calculations and Nitrogen
  • (i) Average atomic mass of X: (16 × 0.9) + (18 × 0.1) = 14.4 + 1.8 = 16.2 u.
  • (ii) Nitrogen (Atomic No. 7):
    Electrons = 7, Protons = 7, Neutrons = 7.
    Atomic Mass = 14 u.
    Electronic Configuration = 2, 5.
    Valency = 8 – 5 = 3.
36. (A) Xylem and Phloem
  • (i) Components of Xylem: Tracheids, Vessels, Xylem Parenchyma, Xylem Fibres.
  • (ii) Non-living component of Phloem: Phloem Fibres.
  • (iii) Main Function: Xylem transports water/minerals. Phloem transports food.
OR
36. (B) Simple Permanent Tissues
  • (i) Comparison:
    Parenchyma: Thin walls, Large spaces.
    Collenchyma: Thick corners, Little space.
    Sclerenchyma: Thick lignified walls, No space.
  • (ii) Hard covering: Sclerenchyma tissue.
  • (iii) Why Permanent?: Because these cells have lost the ability to divide and have taken up a specific role/shape.

SECTION – E: Case-based Questions (4 Marks)

37. (Water Case Study)
  • (a) Law: Law of Constant Proportions.
  • (b) Ratio of atoms: 2:1.
  • (c) Ratio by mass: 1:8.
  • (d) (OR) Formula unit mass: 18 u.
38. (Cell Division Case Study)
  • (a) Two types: Mitosis and Meiosis.
  • (b) Difference: Mitosis = 2 identical cells; Meiosis = 4 cells with half chromosomes.
  • (c) Healing injury: Mitosis (identical cells for repair).
  • (d) (OR) Sexual Reproduction: Meiosis (forms gametes).
39. (Sound Case Study)
  • (a) Faster medium: Aluminium (solid).
  • (b) Slower box: Box B (Air) (gas particles are far apart).
  • (c) Characteristics: (i) Pitch = Frequency. (ii) Distinguish = Quality/Timbre.
  • (d) (OR) Regions: High density = Compression; Low density = Rarefaction.

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