CBSE / NCERT Class 9 Science Practice Question Papers with Answers (2026-27)

Brain Grain · braingrain.in

Science — Practice Paper · Set 1

Class: 9CBSE / NCERTMax Marks: 36

Name: ____________________Reg No: ____________

Part I — Short Answer Questions 18 × 2 = 36

Answer briefly. (Answer all questions.)

1.Arrange the following stages of sexual reproduction in plants in the correct order: (i) Pollen germination on stigma (ii) Fertilisation (iii) Pollination (iv) Formation of zygote[2]

2.Explain with suitable diagram the path that carbon takes to go back to the atmosphere. You may start from plants using CO2 from the atmosphere.[2]

3.Which of the following pairs of cell organelles contains DNA? (i) Chloroplasts, Ribosomes (ii) Mitochondria, Nucleus (iii) Golgi bodies, Ribosomes (iv) Nucleus, Lysosomes[2]

4.Why does asexual reproduction produce offsprings that are genetically identical to the parent?[2]

5.Look at the diagram of a cell in Fig. 2.20. Identify the parts labelled from (a) to (g) and correctly match them with their functions given below: (i) Controlling all the activities of a cell. (ii) Site of cellular respiration. (d) (iii) Storage organelle that also provides rigidity to the (a) (e) cell. (b) (iv) Separates the cell contents from surroundings. (c) (f) (v) Provides structural rigidity to the cell. (vi) Packs and stores materials received from ER. (g) (vii) Helps in manufacturing food.[2]

6.Examine Fig. 5.26. (i) Identify the separation technique marked as ‘S’. (ii) Label the apparatus A, B and C. (iii) Which of the following mixtures can be separated by the technique identified above? Use the data B given in .5. Mixtures: A (a) water — acetone (b) water — salt (c) acetone — alcohol (d) sand — salt C (e) alcohol — chloroform (f) alcohol — benzene S ........................................... .5: Boiling points of some compounds Fig. 5.26 Solvent Water Acetone Alcohol Chloroform Benzene Temperature (°C) 100 ° ° ° ° °C[2]

7.A scientist discovers a new organism with the characteristic features of locomotion and autotrophic nutrition. Which character(s) would help the scientist identify the organism belonging to Protista according to the five kingdom classification?[2]

8.Why are flowers that bloom at night white or light in colour as compared to flowers that bloom during the day?[2]

9.You find an unlabelled slide of a single-celled organism that has a well-defined nucleus and multiple cilia. Which group would it most likely belong to? Give reasons.[2]

10.In the classification hierarchy, which group — class or genus — has fewer members but more features in common? Explain your answer.[2]

11.The potential energy-displacement graph of a 0.5 kg ball moving along a frictionless track is shown in Fig. 7.39. At O, the velocity of the ball is 0 m s–1 and potential energy is 30 J. Calculate the velocity of the ball at P, Q and R.[2]

12.kg moving with a constant velocity of 10 m s–1 encounters a rough patch where the force of friction on the object is 7 N. N opposing the motion is applied on the object. After entering the rough patch, how much distance does the object travel before coming to rest?[2]

13.While practising for the snake boat race (Vallum kalli in Kerala), 100 oarsmen are rowing a boat together. row backwards to propel the boat forward. oarsmen row in the opposite direction. N, what is the net force on the snake boat? (Ignore drag forces, air friction, etc.)[2]

14.Write the chemical formulae for the following compounds. (i) Aluminium nitrate (ii) Calcium oxide (iii) Ferric oxide[2]

15.My father went to a shop from home which is located at a distance of 250 m on a straight road. On reaching there, he discovered that he forgot to carry a cloth bag. He came home to take it, went to the shop again, bought provisions and came back home. How much was the total distance travelled by him? What was his displacement from home?[2]

16.State whether True or False. (i) Work is said to be done when a force is applied, even if the object does not move. (ii) Lifting a bucket vertically upward results in positive work done on the bucket. (iii) The SI unit for both work and energy is joule (J). (iv) A motionless stretched rubber band has kinetic energy. (v) Energy can change from one form to another.[2]

17.Answer the following questions with the help of the data given in Table 5.4: Solubility of various salts (in g per 100 g of water) at different temperatures. (i) What mass of potassium nitrate would be needed to prepare its saturated solution in 50 g of water at 40 °C? (ii) A student makes a saturated solution of potassium chloride in water at 80 °C and leaves the solution to cool at room temperature (25 °C). What would she observe as the solution cools? Explain. (iii) What is the effect of a change in temperature on the solubility of salts? Also, compare the changes in the solubility of the four given salts with increasing temperature from 10 °C to 80 °C.[2]

18.A farmer wants to produce a large number of genetically identical plants quickly. Suggest suitable reproduction methods and explain why they are effective.[2]

🔑 Show Answer Key — Set 1

1. Correct sequence: (iii), (i), (ii), (iv).
2. Carbon path: atmospheric CO₂ → plants by photosynthesis → animals through food → CO₂ returned by respiration; dead matter and wastes → decomposers → CO₂; some carbon becomes fossil fuels over long periods and returns to air by combustion. A diagram should show these arrows.
3. (ii) Mitochondria, Nucleus.
4. Asexual reproduction involves one parent and mitotic division without gamete fusion or recombination, so offspring inherit the same genetic material as the parent except for rare mutations.
5. Match each labelled part to its function as follows: (i) controlling all the activities of the cell — nucleus; (ii) site of cellular respiration — mitochondrion; (iii) storage organelle that also gives the cell rigidity — vacuole; (iv) separates the cell contents from the surroundings — cell membrane (plasma membrane); (v) provides structural rigidity to the cell — cell wall; (vi) packs and stores materials received from the endoplasmic reticulum — Golgi apparatus; (vii) helps in manufacturing food — chloroplast.
6. (i) The technique S is distillation (simple distillation). (ii) In the apparatus, A is the distillation flask that holds the mixture, B is the condenser where the vapour is cooled back to a liquid, and C is the receiver flask that collects the distillate. (iii) Simple distillation separates two miscible liquids whose boiling points differ widely. Using the boiling-point data (water 100 °C, acetone 56 °C, alcohol 78 °C, chloroform 61 °C, benzene 80 °C), the water–acetone mixture (a) is readily separated this way. Pairs with close boiling points — acetone–alcohol (c), alcohol–chloroform (e) and alcohol–benzene (f) — need fractional distillation instead, while water–salt (b) and sand–salt (d) are not liquid–liquid mixtures and are separated by evaporation or filtration rather than this setup.
7. A unicellular eukaryotic body, locomotory structures such as flagella/cilia, and autotrophic nutrition would point to Protista, since protists can show plant-like and animal-like characters.
8. Night-blooming flowers are often white or pale so they are visible in low light to night pollinators such as moths. Many also produce fragrance to attract pollinators.
9. It most likely belongs to Protista because it is unicellular, eukaryotic, has a well-defined nucleus and uses cilia for movement, as in ciliates such as Paramecium.
10. Genus has fewer members and more shared features than class because genus is a lower, more specific taxonomic category.
11. At P: 2√10 m s⁻¹; at Q: 0 m s⁻¹; the ball cannot reach R.
12. 10 m.
13. 18,000 N in the forward direction.
14. (i) Al(NO₃)₃ (ii) CaO (iii) Fe₂O₃.
15. Total distance = 1000 m; displacement = 0 m.
16. (i) False (ii) True (iii) True (iv) False (v) True.
17. At 40 °C, 62 g KNO₃ dissolves in 100 g water, so 31 g is needed for 50 g water. On cooling saturated KCl from 80 °C, crystals separate because solubility decreases. Solubility generally increases with temperature; KNO₃ increases sharply, NH₄Cl and KCl moderately, and NaCl very little.
18. Use vegetative propagation such as cuttings, grafting, layering or tissue culture. These methods rapidly produce many genetically identical plants and preserve desirable traits of the parent.

Brain Grain · braingrain.in

Science — Practice Paper · Set 2

Class: 9CBSE / NCERTMax Marks: 36

Name: ____________________Reg No: ____________

Part I — Short Answer Questions 18 × 2 = 36

Answer briefly. (Answer all questions.)

1.What would happen if gametes are formed by mitotic divisions?[2]

2.Determine the formula unit mass of the following substances. (i) Ammonium nitrate (NH4NO3), used as a nitrogen fertiliser, which is essential for plant growth. (ii) Phosphoric acid (H3PO4), used to make phosphate fertiliser and detergents. (iii) Sodium hydrogencarbonate (NaHCO3), used to relieve acidity and helps in digestion.[2]

3.Which phenomenon inhibits the formation of tumors in the human body? Can plants also develop tumors? Explain.[2]

4.Blood is an example of a colloidal mixture. (i) What would happen if blood behaved like a true suspension inside the body? (ii) In a blood sample, identify the dispersed phase and the dispersion medium.[2]

5.In the lower Himalayan region of northern India, apples are an important cash crop that contribute significantly to farmer’s livelihoods. The fruit yield in apple cultivation is declining continuously, associated with climate change and a significant decline in the population of natural pollinators. A researcher-farmer group set up two experimental apple orchards at two distinct locations: Places A and B. In apple orchards at Place A, they allowed natural pollinators to pollinate the flowers of the apple. In apple orchards at Place B, they applied mixed farming techniques of beekeeping. Along with honey, the farmer yielded apples. The yield of apples is depicted in Fig. 11.24, in terms of fruit setting (number of fruits/the total number of corresponding fruit-bearing branches) and cent fruit drop (premature falling of developing fruits) in the two types of experimental placesPer of apple orchards. (i) What are the hypotheses the researcher- farmers group has thought of for this investigation? (ii) What are the different parameters in the experiment? (iii) Compare and analyse the data of two experimental orchards Places A and B, in terms of high yields of apple fruits. (iv) Based on your analysis, what do you infer from the data?[2]

6.A mixture can be categorised as a solution, a suspension, or a colloid, each possessing distinct properties. Utilise the words or phrases provided in the box to fill in the .2. Words and phrases may be used more than once. Words and Phrases Large-sized particles; Particles remain evenly distributed; Small-sized particles (less than 1 nm diameter); Moderate-sized particles (1 – 1000 nm); Settles down when left undisturbed (more than 1000 nm in diameter); Does not settle down; Scatters light; Separates by filtration; Transparent; Salt solution; Milk; Sand in water; Smoke; Heterogeneous mixture; Cannot be separated by filtration; Mud; Butter; Brass. .2. .2 Solution Suspension Colloid Properties Properties Properties __________________________ __________________________ __________________________ __________________________ __________________________ __________________________ Examples Examples Examples __________________________ __________________________ __________________________ __________________________ __________________________ __________________________[2]

7.Which of the following mixtures are correctly classified as homogeneous (Hm) and heterogeneous (Ht)? Choose the correct option. (i) Air — Hm, Milk — Ht, Sugar solution — Hm, Smoke — Hm (ii) Brass — Ht, Fog — Ht, Vinegar — Ht, Muddy water — Hm (iii) Copper sulfate solution — Hm, Salt solution — Hm, Milk — Hm, Bronze — Hm (iv) Muddy water — Ht, Milk — Ht, Blood — Ht, Brass — Hm[2]

8.Meristematic tissues divide repeatedly. What property of their cells allows them to do this? (i) They have thick walls for protection. (ii) They contain large vacuoles that store nutrients. (iii) They have thin walls, dense cytoplasm and large prominent nucleus. (iv) They are functionally differentiated cells.[2]

9.What outcome do you expect, if all the mitochondria are removed from a eukaryotic cell?[2]

10.A ship searching for a sunken ship sent a sonar signal and detected an echo after 5 s. If ultrasonic wave travels at 1525 m s–1 in seawater, approximately how far down in the ocean is the wreckage of the sunken ship located?[2]

11.What conclusion did Rutherford draw about the position and characteristics of the atom’s positively charged part based on the few alpha particles that bounced back or were deflected at large angles in the gold foil experiment?[2]

12.The gravitational attraction on the surface of the Moon (lunar Displacement (m) 1 Fig. 7.37 surface) is about th of that on the surface of the Earth. 6 m from the surface of the Earth. How far up will the ball thrown with the s–1) A B same upward velocity travel from the surface of the Moon? 35 (m[2]

13.Why are the epithelial tissues that line an animal’s internal organs usually only one or a few cells thick? (i) To store food efficiently. (ii) To provide maximum strength. (iii) To allow quick exchange of materials across them. (iv) To reduce friction.[2]

14.kg is thrown up with a velocity of 20 m s–[2]

15.Explain how the Earth’s atmosphere helps in maintaining a suitable temperature for life to survive on the Earth.[2]

16.The sound waves emitted by three sources A, B and C are represented in Fig. 10.31. If the frequency of A is maximum and C is minimum, identify the corresponding curves, and mark A, B and C on them. Density Distance Fig. 10.31[2]

17.protons, 12 neutrons and 10 electrons then (i) what is its atomic number and mass number? (ii) is it neutral, a cation or an anion? Explain. (iii) write its electronic configuration. (iv) name the species.[2]

18.How are mountain and valley breezes formed? Suppose there are two mountains, one covered with grass and another covered with barren rocks; would the temperature of the two mountain breezes be different? If so, how?[2]

🔑 Show Answer Key — Set 2

1. Gametes would retain the diploid chromosome number; after fertilisation the zygote would have double the normal chromosome number, causing serious developmental problems.
2. (i) 80 u (ii) 98 u (iii) 84 u.
3. Apoptosis, or programmed cell death, helps remove abnormal cells and inhibits tumour formation. Plants can also develop tumour-like abnormal growths, such as galls, when cell division is disturbed by pathogens or hormones.
4. If blood behaved like a true suspension, its cells/components would settle and circulation would be disrupted. In blood, the dispersed phase includes blood cells and colloidal particles; plasma is the dispersion medium.
5. The hypothesis is that beekeeping increases pollination and apple yield. Parameters include pollination method, fruit setting, fruit drop, orchard location and environmental conditions. Orchards with beekeeping should show higher fruit set and lower fruit drop, supporting the inference that managed pollinators improve yield and farmer income.
6. Solution: homogeneous, particles less than 1 nm, transparent, do not settle, not separated by filtration; examples salt solution and brass. Suspension: heterogeneous, particles more than 1000 nm, settle on standing, separable by filtration; examples sand in water and mud. Colloid: heterogeneous, particles 1-1000 nm, scatter light, do not settle, not separated by ordinary filtration; examples milk, smoke and butter.
7. (iv) Muddy water — Ht, Milk — Ht, Blood — Ht, Brass — Hm.
8. (iii) They have thin walls, dense cytoplasm and large prominent nucleus.
9. The cell would lose its main site of ATP production; energy-dependent activities would fail and the cell would eventually die.
10. 3812.5 m.
11. Rutherford concluded that the atom’s positive charge and most of its mass are concentrated in a very small, dense central nucleus, while most of the atom is empty space.
12. 48 m.
13. (iii) To allow quick exchange of materials across them.
14. (i) Negative during upward motion and positive during downward motion. (ii) –12 J.
15. The atmosphere lets sunlight in but absorbs and re-emits some outgoing infrared radiation through greenhouse gases, reducing extreme cooling. Winds and water vapour also redistribute heat.
16. A is the curve with the highest frequency (shortest wavelength), C is the curve with the lowest frequency (longest wavelength), and B is the remaining curve. The answer key maps them as A—green, B—red, C—blue.
17. (i) Z = 11, A = 23. (ii) Cation. (iii) Electronic configuration 2, 8. (iv) Sodium cation, Na⁺.
18. During the day, heated mountain slopes warm air, which rises and draws air up from valleys as valley breeze. At night, slopes cool and dense air flows downward as mountain breeze. A barren rocky mountain breeze may be warmer by day than a grass-covered one because rocks heat faster and vegetation cools by evaporation.

Brain Grain · braingrain.in

Science — Practice Paper · Set 3

Class: 9CBSE / NCERTMax Marks: 36

Name: ____________________Reg No: ____________

Part I — Short Answer Questions 18 × 2 = 36

Answer briefly. (Answer all questions.)

1.Magnesium is essential for many biological processes, including muscle contraction. For an atom of magnesium with a mass number of 24 and atomic number 12, determine the number of (i) protons, (ii) neutrons, (iii) electrons, and also illustrate the arrangement of electrons in a magnesium atom.[2]

2.s to 120 s for a cyclist is shown in Fig. 4.30. Shade the areas (in different colours) representing the displacement of the cyclist (i) while cyclist is moving with constant velocity. (ii) when the velocity of cyclist is decreasing. s time interval. 6 7.5 h–1) s–1) 5 (Km (m 4 5.0 3 Velocity 2.5 1 0 20 40 60 80 100 120 0 2 4 6 Time (s) Time (h) Fig. 4.30 Fig. 4.31[2]

3.A girl is riding her scooter and finds that its speedometer reading is constant. Is it possible for her scooter to be accelerating and if so, how?[2]

4.What are the impacts of deforestation on the Earth’s oxygen and carbon cycles? What are the other consequences of deforestation?[2]

5.A source produces a sound wave of wavelength 3.44 m. If the wave travels with a speed of 344 m s–1 find its time period.[2]

6.Two identical sound sources are placed at A and B — one in air and one submerged in water (Fig. 10.34). Both produce sounds at the same time, which travel horizontally to the vertical side of the cliff and come back. .5 times than that of B, what is the ratio between the speeds of sound in air and water? A B Fig. 10.34[2]

7.Suresh prepares slides with pollen grains in different sugar concentrations (0%, 2.5%, 5%, 7.5%, 10%) to study the germination of pollen. (i) What are the different hypotheses which can be tested using this set-up? (ii) What parameters should be kept the same in this set-up?[2]

8.A tractor pulls a harrow (a ploughing tool) of mass m1 with a net force F resulting in an acceleration of a1. The same tractor pulls a trolley of mass m2 with a force F producing an acceleration of a2. If the tractor now pulls the trolley with the harrow placed on it (with the same force F ), then obtain an expression for the resulting acceleration in terms of a1 and a2. Ignore friction.[2]

9.m s–1 in 6 s. Find the average acceleration and the distance travelled in these 6 s.[2]

10.A coconut of mass 1.5 kg falls from the top of a coconut tree onto the wet sand on a beach. The height of the tree is 10 m. On impact, the coconut comes to rest by making a depression in the sand. (i) Calculate the velocity of the coconut just before it hits the sand. (ii) Assume that the average resistive force of sand is 3000 N and all of the coconut’s energy is used to create the depression in the sand. Calculate the depth of the depression the coconut makes in the sand. Assume g = 10 m s–2.[2]

11.Choose the correct statement(s) and correct the false statement(s). (i) Elements are made up of molecules and compounds are made up of atoms. (ii) The molecule of a compound is always made up of two or more atoms of the same kind. (iii) One molecule of nitrogen gas contains three nitrogen atoms. (iv) Water is made of two hydrogen atoms, covalently bonded with one oxygen atom.[2]

12.An ace footballer converted a penalty shot by kicking the football with a speed of 108 km h–[2]

13.The composition of the nuclei of three atomic species X, Y, and Z are given as follows. X Y Z 17 17 18 20 Explain the relation between the following: (i) Y and Z (ii) Z and X[2]

14.Electrons move around the nucleus in orbits. Why do they not fly away from the atom? Explain what keeps them attracted to the nucleus.[2]

15.How is heat lost from the surface of the Earth? What is its significance?[2]

16.When a ball thrown upwards reaches its highest point, tick which of the following statement(s) are correct? (i) The force acting on the ball is zero. (ii) The acceleration of the ball is zero. (iii) Its kinetic energy is zero. (iv) Its potential energy is maximum.[2]

17.km h–1 when the driver sees an obstacle 30 m ahead. .5 seconds to react before pressing the brake. Once the brake is applied, the velocity of the bus reduces with constant acceleration of 2.5 m s–[2]

18.How would you separate the mixtures given in Table 5.3? Mention the reason for choosing your method. If a mixture cannot be separated, explain why. Mixtures: mud from muddy water; plasma from other components in the blood sample; naphthalene and sand; chalk powder and common salt; common salt and water; oil from water; pigments of the flower.[2]

🔑 Show Answer Key — Set 3

1. Protons = 12, neutrons = 12, electrons = 12; electronic configuration = 2, 8, 2.
2. Displacement is the area under the velocity-time graph. From Fig. 4.30, total displacement is 320 m and average acceleration over 120 s is 1/60 m s⁻². Shade the constant-velocity rectangular region and the decreasing-velocity triangular/trapezium region.
3. Yes. If speed is constant but direction changes, velocity changes, so the scooter is accelerating.
4. Deforestation reduces photosynthesis, so less CO₂ is removed and less O₂ is released; burning/decay of trees adds CO₂. It also causes habitat loss, biodiversity decline, soil erosion, disturbed rainfall, floods and climate warming.
5. 0.01 s.
6. 2:9.
7. Hypotheses: pollen germination depends on sugar concentration and has an optimum concentration. Constants should include pollen source, temperature, time, solution volume, slide method, number of pollen grains and observation method.
8. m₁ = F/a₁ and m₂ = F/a₂. For the combined load, acceleration = F/(m₁+m₂) = F/[F/a₁ + F/a₂] = a₁a₂/(a₁+a₂).
9. Acceleration = 4 m s⁻²; distance = 72 m.
10. (i) 10√2 m s⁻¹ (ii) 0.05 m.
11. Only statement (iv) is correct. Corrections: elements are made of atoms or molecules of the same kind; compounds contain atoms of different elements chemically combined; nitrogen gas is N₂, so one molecule contains two nitrogen atoms.
12. 0.015 s.
13. (i) Y and Z are isotopes. (ii) Z and X are isobars.
14. Electrons are negatively charged and the nucleus is positively charged, so electrostatic attraction keeps electrons bound to the atom instead of flying away.
15. Earth loses heat mainly by emitting infrared radiation to the atmosphere and space; heat is also transferred by convection, conduction and evaporation. This maintains Earth’s energy balance and suitable temperatures.
16. (iii) and (iv).
17. The bus travels 25 m before stopping, so yes, it stops before the obstacle.
18. Mud from muddy water—sedimentation/decantation and filtration; plasma from blood—centrifugation; naphthalene and sand—sublimation; chalk powder and common salt—dissolve salt, filter chalk, evaporate filtrate; common salt and water—evaporation/crystallisation; oil from water—separating funnel; flower pigments—chromatography.

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