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Roll No. Series JPR_PBI/25-26/10/086/SET No.1 NOTE:- * Please check that this question paper contains 10 printed pages. *« Please check that this question paper contains 39 questions. *« Please write down the serial number of the question in the answer-book before attempting it. * 15 minutes time has been allotted to read the question paper. The students will read the question paper only and will not write any answer on the answer- book during this period. SCIENCE (086) Time allowed: 3 hours Maximum Marks: 80 General Instructions: (i) This question paper consists of 39 questions in 3 sections. Section A is Biology, Section B is Chemistry and Section C is Physics. (ii) All questions are compulsory. However, an internal choice is provided in some questions. A student is expected to attempt only one of these questions. SECTION A 1. | The process in which loss of water in the form of vapours from the aerial parts of plants | 1 takes place is X, which helps in Y. Here X and Y respectively are :- (a) transpiration and translocation. ( b) (c) translocation and movement of soluble products of photosynthesis in phloem. (d) translocation and absorption of water and minerals from soil by roots. transpiration and temperature regulation. 2. | Refer to the given figure and select the option that correctly matches the labelled parts | 1 (i)-(iv) with their functions (a) - (d). a b Cc d Carries deoxygenated blood to the heart from the body parts Carries oxygenated blood to the body parts from the heart Carries deoxygenated blood to the lungs from heart Carries oxygenated blood to the heart from lungs ( ( ( ( Se SS 1 Select the incorrect match from: A. Auxin- Regulates tropism B. Abscisic acid- Promotes dormancy in seeds and buds C. Cytokinin- Speeds ageing in leaves D. Gibberellin- Promotes growth A student accidentally places her hand on a flame of candle and quickly pulls her hand. Here flame of candle is:- (a) a response (b) a stimulus (c) an impulse (d) an effector In a monohybrid cross between two heterozygous individuals, percentage of heterozygous individuals obtained in F, generation is A.25% B.50% C.75% OD. 100%. _——\_—————» Garden Grasshopper lizard ( Frog > Rabbit _,* Grass > Eagle \ Seed saing bird ——~ Refer to the given food web. How many primary and secondary consumers are present in the given food web respectively? A23 B.34 C32 D.4,3 In the given food chain, suppose the amount of energy at fourth trophic level is 5 kJ, what will be the energy available at the producer level? Grass — Grasshopper — Frog — Snake — Hawk (a) 5k J (b) 50 k J (c) 500 k J (d) 5000 k J The following two statements consist of two statements-Assertion (A) and Reason (R). 2 (iii) Express the genotype of the (a) parents and (b) F1 Progeny 15. | Ravi had a lunch consisting of rice, dal, salad, and ghee. Help him understand the 4 process of digestion of this meal by answering the questions below. Attempt either subpart_A or B A. Which of these food items is rich in carbohydrates? Where does its digestion start and where does it get completed? Name the enzymes involved. OR B. Which of these food items contains proteins? Describe the process of its digestion from the stomach to the small intestine. CG. Which part of the alimentary canal receives bile? What is the role of bile in digestion? D. In which part of the alimentary canal are the end products of digestion absorbed into the blood? Name these end products. 16. 3 A. State the changes that take place in the uterus when + (i) Implantation of embryo has occurred. 2 (ii) Female gamete is not fertilized. = B. What are the effects of contraception on health and prosperity of a family? 5 OR A. Explain with the help of a diagram how pollen after landing on the stigma of a flower helps male germ cell to reach the female germ cell. Label the following: ovary, female germ cell, male germ cell and pollen grain. B. What is the fate of ovary, ovule, style and sepals after fertilization? SECTION B 17. | Identify the correct statement about the following reaction: 1 2H2S + SO ----> 2H20 +S (A) H2S is oxidising agent and SOz is reducing agent. (B) H2S is reduced to sulphur. (C) SO, is oxidising agent and H2S is reducing agent. (D)SObz is oxidised to sulphur. 18. | Match column | with column Il and select the correct option from the given codes. 1 Column | Column Il P. A metal that reacts with steam (i) Potassium Q. A metal that reacts only with hot water (ii) Gold R. A metal that does not even react with steam (iii) Magnesium S$. A metal that reacts violently with cold water (iv) Aluminium (A) P - (iii), Q - (ii), R-(iv), S—-(i) (B) P - (iv), a- (ii), R-(i), S-(i) (C) P - (iv), -(ii), R-(iii), S-() (D) P - (i), a (iii), R-—-(ii), S (iv) 19. MsPooja, a science teacher took Mg, Al, Fe and Pb strips and inserted them in four test tubes |, Il, Ill and IV respectively, each containing zinc sulphate solution, as shown in thefollowing figure: The reaction will not occur in test tube(s) A.l only B. Ill and IV only C. Il and IV only D. | and II only. 20. Sodium hydrogen carbonate when added to acetic acid evolves a gas.Which of the following statements are true about the gas evolved? (i) It turns lime water milky. (ii) It extinguishes a burning splinter. (iii) It dissolves in a solution of sodium hydroxide. (iv) It has a pungent odour. (a)(i) and (ii) (b) (i), (ii) and (iii) (c) (ii), (iii) and (iv) (d) (i) and (iv) 21. A sample of soil is mixed with water and allowed to settle. The solution turns the pH paper yellowish-orange. Which of the following would change the colour of this pH paper to greenish-blue? (a)Lemon juice (b) Vinegar (c) Common salt (d) An antacid 22. Reaction between X and Y forms compound Z. X loses an electron and Y gains an electron. Which of the following properties is not shown by 2? (a) Has high melting point (b) Has low melting point (c) Conducts electricity in molten state (d) Occurs as solid 23. Solid calcium oxide reacts vigorously with water to form calcium hydroxide, accompanied by liberation of heat. This process is called slaking of lime. Calcium hydroxide dissolves in water to form a solution called lime water. Which among the following is/are true about slaking of lime and the solution formed? (i) It is an endothermic reaction. (a) In place of zinc granules, same amount of zinc dust is taken in the test tube. (b) In place of zinc, copper turnings are taken. (c) Sodium hydroxide is taken in place of dilute sulphuric acid and the test tube is heated. OR Identify the compound X on the basis of the reactions given below. Also, write the name and chemical formulae of A, B and C. +Zn (A) + H, (g) +HCl Compound X > (B)+H,O +CH,COOH OS tena. (C) + H,O 29. A saturated organic compound 'A" belongs to the homologous series of alcohols. On heating 'A' with concentrated sulphuric acid at 443 K, it forms an unsaturated compound 'B' with molecular mass 28 u. The compound 'B' on addition of two atoms of hydrogen in the presence of Nickel, changes to a saturated hydrocarbon 'C'. (i) Identify A. B and C. (ii) Write the chemical equations showing the conversion of A into B. (iii) What happens when compound A undergoes combustion? (iv) State one industrial application of hydrogenation reaction. (v) Name the products formed when compound A reacts with sodium. OR (i) With the help of diagram, show the formation of micelles, when soap is applied on oily dirt. (ii) Take two test tubes X and Y with 10 mL of hard water in each. In test tube 'X', add few drops of soap solution and in test tube Y add a few drops of detergent solution. Shake both the test tubes for the same period. (a) In which test tube the formation of foam will be more ? Why? (b) In which test tube is a curdy solid formed? Why? SECTION C 30. Beams of light are incident through the holes A and B and emerge out of box through the holes C and D respectively, as shown in the figure. Which of the following could be inside the box? (a) A rectangular glass slab (b) A convex lens (c) A concave less (d) A prism 31. Which of the following statements are correct? (i) Sky appears blue because of scattering of blue component of sunlight by water droplets suspended in air. (ii) The light coming from far off stars to the Earth, bends towards the normal. (iii) The lower part of bi-focal lens is a concave lens. (iv) Short sightedness is corrected by concave lens which Has a negative focal length A. (i), (ii) and (iv) only B. (ii) and (iv) only C. ( ii), (iii), and (iv) only D. (i), (ii), (iii) and (iv) The following question consist of two statements-Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below: (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 cormet explanation of (A). (c) (A) is true, but (R) is false. (d) (A) is false, but (R) is true 32. Assertion (A): Myopic eye cannot see distant objects distinctly. Reason (R): For the correction of myopia converging lenses of appropriate power are prescribed by eye-surgeons. 33. Raj focuses the beam of light coming from laser on a glass slab. Draw diagrams to show path of the ray of light when it falls (a) normally ( perpendicular) on the surface of glass slab and (b) obliquely on the surface of the glass slab. 34. Find out the following in the electric circuit given in the figure :- (a) Effective resistance of the network of four resistors (a) Will the bulb in the two circuits glow with the same brightness? Justify your answer. (b) Now, let one bulb in both the circuits get fused. Will the rest of the bulbs continue to glow in each circuit? Give reason. OR (a) List the factors on which the resistance of a uniform cylindrical conductor of a given material depends. (b) The resistance of a wire of 0.01 cm radius is 10 ohm. If the resistivity of the wire is 50 x 10° O m, find the length of this wire 10 SCIENCE — Code no. 086 SAMPLE QUESTION PAPER* CLASS — X (2025-26) Max. Marks: 80 Time Allowed: 3 hours General Instructions: (i) | This question paper consists of 39 questions in 3 sections. Section A is Biology, Section B is Chemistry and Section C is Physics. (ii) All questions are compulsory. However, an internal choice is provided in some questions. A student is expected to attempt only one of these questions. Section-A Marks Select the group in which all organisms have the same mode of nutrition. A. Cuscuta, yeast, legumes, leeches and tapeworm B. Cactus, ticks, lice, leeches and cow C. Cuscuta, ticks, lice, leeches and tapeworm D. Cactus, grass, lice, lion and tapeworm 1 Which of the following options indicates the products formed after breakdown of the glucose in our muscle cells when there is lack of oxygen? A. Ethanol + carbon dioxide + Energy B. Lactic acid + Energy C. Lactic acid + carbon monoxide + Energy D. Carbon dioxide + Water + Energy Which of the following is a correct combination of function and part of the brain? A. Posture and balance: Cerebrum B. Salivation: Medulla in midbrain C. Hunger: Pons in hindbrain D. Blood pressure: Medulla in hindbrain The blood glucose level in a patient was very high. It may be due to inadequate secretion of: A. growth hormone from pituitary gland B. oestrogen from ovary C. insulin from pituitary gland D. insulin from pancreas In a cross between black furred rabbit (B) and white furred rabbit (b), all offspring were found to have black fur. What can be inferred about the genetic makeup of the parent rabbits? A. BB X bb B. Bb X Bb C. Bb X bb D. bb X bb “Please note that the assessment scheme of the Academic Session 2024-25 will continue in the current session i.e. 2025-26. rabbit, frog, grass, fish, fox, water insects, zebra, peacock, snake, trees, bird, owl, insects, tiger, vulture, duck. Create a food web comprising two separate food chains with different producers by using the above data. 13 Draw and explain how the nerve cells help in transmission of impulses? 14 In a genetic experiment, plants with pure round green seeds (RRyy) were crossed with plants with wrinkled yellow seeds (rrYY). (i) Show the gametes formed when F1 was self-pollinated. (ii) A total of 144 seeds were produced which developed into saplings. Show the ratio in which these traits are independently inherited in these144 sapling. 15 Neha consumed boiled sweet potatoes and boiled eggs for breakfast. Help her to understand some steps in the process of digestion of the food taken by her by answering the questions given below. Attempt either subpart A or B. A. Which of these food items is rich in proteins? In which part of the alimentary canal is the digestion of this component initiated? Name the enzymes, conditions required and the glands associated with the digestion here. OR B. Which of these food items contains fats? How is it digested? C. Which of these food items is rich in starch? How is its digestion initiated? D. The figure given below represents parts of the human alimentary canal. Which of these parts will have the maximum amount of digested food as soon as the process of digestion is completed? ) ee L Sp ra Figure: Human Alimentary canal “Please note that the assessment scheme of the Academic Session 2024-25 will continue in the current session i.e. 2025-26. For visually impaired students D. How will the digested food be taken up by the alimentary canal? 16 Attempt either option A or B. A. Puneet wanted to grow banana plants. (i) Based on your knowledge on plant reproduction should he opt for seeds or any alternate method of reproduction. Justify your answer. (ii) Offsprings of a banana plant usually show very little variation. What causes variation and are variations good or bad? Justify. OR B. Annie was conducting research on the number of fruits produced by watermelon under different conditions. She grew 25 watermelon plants each in both glass house A and B. She introduced pollinators in glass house A only. (i) What difference will she observe in the number of fruits produced in the two glass houses? Explain with reason. (ii) List 3 changes that will occur in a flower once it gets fertilized. Section -B 17 Which of the following equations represent redox reactions and what are the values for ‘p’ and ‘q’ in these equations? Equation 1: FezOs(s) + 2Al(s) ——* AlzOs (s) + p Fe(l) + heat Equation 2: 2C4H10(g) + 1302(g) —4+» 8COa2(g)+ q H2O(g) A. Only equation 1 is a redox reaction, p =1 and q=3 B. Both equations 1 and 2 are redox reactions, p= 2 and q=4 C. Only equation 2 is a redox reaction, p= 2 and q= 10 D. Both equations 1 and 2 are redox reactions, p= 2 and q=10 18 Four statements about the reactions of oxides with dilute hydrochloric acid and aqueous sodium hydroxide are listed. |. Aluminium oxide reacts with both dilute hydrochloric acid and aqueous sodium hydroxide. Il. Calcium oxide reacts with dilute hydrochloric acid and aqueous sodium hydroxide. Ill. Zinc oxide reacts with both dilute hydrochloric acid and aqueous sodium hydroxide. IV. Sulphur dioxide does not react with either dilute hydrochloric acid or aqueous sodium hydroxide. Which statements are correct? A. land Il B. | and Ill C. Il and IV D. Ill and IV *Please note that the assessment scheme of the Academic Session 2024-25 will continue in the current session Le, 2025-26. C. Ais true but R is false. D. Ais false but R is true. 24 Assertion (A): CaHs, CaHe and C4H10 are members of the same homologous series Reason (R): CsHs, CaHe, C3aHs, CsaHe, Ca2Hs, CaH2 are unsaturated hydrocarbons. 25 The following activity is set-up in the science lab by the teacher. He clamped an aluminium wire on a stand and fixed a pin to the free end of the wire using wax. Then he heated the wire with a burner from the end where the wire is clamped. Students observed the pin fall off. ee ated Metal wipe py |_| [ =r 4 wue j a) Le Wis a A. If the teacher replaces aluminium wire by silver wire, will the students’ observation change? Justify your answer. B. Will the aluminium wire melt? Give reason for your answer. + spirit lamp 26 Attempt either option A or B. A. An element ‘X’ is stored in kerosene, and cannot be extracted from its ore using a reducing agent. ‘x’ forms an ionic compound on reaction with chlorine. (i) Can we store ‘X’ in water? Give reason to support your answer. (ii) Identify element ‘X’. Name the process used and write the equation for extraction of ‘x’ from its ore. OR B. The domes of many building in Europe are made of copper. These domes now appear greenish in colour. (i) Why do the domes appear greenish though copper is orange-red in colour? (ii) In your opinion, should the copper domes be replaced by iron domes to overcome the problem of change of colour of copper domes? (iii) Domes used to be made from thin sheets of metals. Why did the ancient architects use copper to make domes? 27 Amrita electrolysed distilled water using the set-up shown in figure 1. She was expecting two gases to be evolved at the anode and cathode respectively “Please note that the assessment scheme of the Academic Session 2024-25 will continue in the current session i.e. 2025-26. Plastic mug Test tube ——} Water Graphite rod Water Rubber stopper Anexie Cathode Switch Fig.1 Suddenly, she realised that the bulb in the circuit did not glow when she used distilled water (figure 2) | f { @) Bulb Battery \\ | Conducting Wire distilled water Fig. 2 After this realization, she added a substance to the distilled water for electrolysis to take place. Answer the following questions based on the information given above: A. Which gas was she expecting to be formed at the anode and which one at the cathode respectively? B. Why did the bulb not glow when Amrita passed electricity through distilled water? C. Which substance was added by Amrita to distilled water to get the expected result? For visually impaired students Identify the type of reaction: A. ZnO0+C ~ * Zn+CO B. ZnCO3 heat, ZnO+CO2 C. 2Mg+O2 _-+_ » «=2MgO + heat 28 Sara took 2 mL of dilute NaOH solution in a test tube and added two drops of phenolphthalein solution to it. The solution turned pink in colour. She added dilute H2SQO4 to the above solution drop by drop until the solution in the test tube became colourless. 40 drops of dilute H2SO4 were used for the change in “Please note that the assessment scheme of the Academic Session 2024-25 will continue in the current session ie, 2025-26. (e) Write a balanced chemical equation for the reaction of CxHy with hydrogen gas in presence of Nickel. OR B. The electronic structures of atoms P and Q are shown below a) Based on the information given above, answer the following questions: (a) If P and Q combine to form a compound, what type of bond is formed between them? (b) Give the chemical formula of the compound formed. (c) The compound so formed is dissolved in water. Is the resultant solution acidic or basic in nature? Justify your answer. (d) Write the chemical equation for the reaction between ‘Q’ and ethanol. (e) What will be the formula of the compound formed when ‘P’ undergoes bonding with carbon? For visually impaired students A. Ahydrocarbon with the formula CxHy undergoes complete combustion as shown in the following equation: 2CxHy + 902 — 6CO2 + GH20. (a) What are the values of ‘x’ and ‘y’? (b) Give the chemical (IUPAC) name of the hydrocarbon. (c) Is CxHy a saturated or an unsaturated hydrocarbon? (d) Name the alcohol which on heating with conc. H2SOs will produce the above hydrocarbon CxHy. (e) Write a balanced chemical equation for the reaction of CxHy with hydrogen gas in presence of Nickel. OR B. Oxygen can combine with both metals and non-metals. It combines with Calcium to form CaO and with carbon to form CO2. (a) What type of bond is formed between carbon and oxygen? (b) Identify the type of bond formed between Calcium and oxygen. (c) Which of the above compounds will be a good conductor of electricity in molten state and why? (d) Comment on the physical state (solid, liquid or gas) of CaO and COz. (e) What is the valency of carbon in CO2? “Please note that the assessment scheme of the Academic Session 2024-25 will continue in the current session ie. 2025-26. Section-—C 30 Arnav was making notes and he wrote down the following statements from his 1 understanding of reflection from curved surfaces. |. | Concave mirrors can produce both real and virtual images depending on the position of the object. ll. Convex mirrors always produce real, inverted images regardless of the object's position. Ill. In both concave and convex mirrors, the image location can be te Aine 4 determined using the mirror formula F 7 + 7 where f is the focal length, v is the image distance, and u is the object distance. Choose from the following the correct option that lists the correct statements about reflection from curved surfaces. A. land Il B. |, land Ill C. Il and Ill D. | and Ill 31 | Choose the correct option from the below which explains the reason for us to 1 perceive the day sky as blue. A. As sunlight passes through the atmosphere, shorter wavelengths, such as blue are scattered more than other colors. B. The sky appears blue because all colors are scattered equally, but blue light is stronger and more visible to the human eye. C. The blue color of the sky is due to longer wavelengths like red and orange scattering more than shorter wavelengths, making blue stand out more. D. The atmosphere contains blue-colored particles that give the sky its blue appearance. The following question consists of two statements — Assertion (A) and Reason (R). Answer these questions by selecting the appropriate option given below: A. Both A and R are true, and R is the correct explanation of A. B. Both A and R are true, and R is not the correct explanation of A. C. Ais true but R is false. D. Ais false but R is true. 32 | Assertion (A): A point object is placed at a distance of 26 cm from a convex 1 mirror of focal length 26 cm. The image will not form at infinity. Reason (R): For above given system the equation 7 = = + = gives V = o. *Please note that the assessment scheme of the Academic Session 2024-25 will continue in the current session ie. 2025-26. 
