NBSE_Science

Series : NBSE/S/10  SET ~ 1 jksy ua- iz'u&i=k dksM 086/10/1 Roll No. Q.P. Code ijh{kkFkhZ iz'u&i=k dksM dks mRrj&iqfLrdk osQ eq[k&i`\"B ij vo'; fy[ksaA Candidates must write the Q.P. Code on the title page of the answer-book. uksV NOTE (I) Ñi;k tk¡p dj ysa fd bl iz'u&i=k esa eqfær (I) Please check that this question i`\"B 11 gSaA paper contains 11 printed pages. (II) i'z u&i=k eas nkfgus gkFk dh vkjs fn, x, (II) Q.P. Code number given on the i'z u&i=k dksM dks Nk=k mRrj&iqfLrdk osQ right hand side of the question eq[k&i`\"B ij fy[ksaA paper should be written on the title page of the answer-book by the candidate. (III) Ñi;k tk¡p dj ysa fd bl iz'u&i=k esa 39 (III) Please check that this question iz'u gSaA paper contains 39 questions. (IV) Ñi;k iz'u dk mRrj fy[kuk 'kq: djus ls (IV) Please write down the Serial igys] iz'u dk Øekad vo'; fy[ksaA Number of the question before attempting it. (V) bl iz'u&i=k dks i<+us osQ fy, 15 feuV (V) 15 minutes time has been allotted dk le; fn;k x;k gSA iz'u&i=k dk forj.k to read this question paper. The iwokZg~u 10-15 cts fd;k tk,xkA 10-15 cts ls question paper will be distributed 10-30 cts rd Nk=k osQoy iz'u&i=k dks i<+saxs at 10.15 a.m. From 10.15 a.m. to vkSj bl vofèk osQ nkSjku os mRrj&iqfLrdk ij 10.30 a.m., the candidates will dksbZ mRrj ugha fy[ksaxsA read the question paper only and will not write any answer on the answer-book during this period. fuèkkZfjr le; % 3 ?kaVs SCIENCE vfèkdre vad % 80 Time Allowed : 3 Hours Maximum Marks : 80 1 NBSE 2023 P.T.O.

General Instructions: (i) This question paper consists of 39 questions in 5 sections. (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. (iii) S ection A consists of 20 objective type questions carrying 1 mark each. (iv) Section B consists of 6 Very Short questions carrying 02 marks each. Answers to these questions should be in the range of 30 to 50 words. (v) Section C consists of 7 Short Answer type questions carrying 03 marks each. Answers to these questions should be in the range of 50 to 80 words (vi) Section D consists of 3 Long Answer type questions carrying 05 marks each. Answer to these questions should be in the range of 80 to 120 words. (vii) Section E consists of 3 source-based/case-based units of assessment of 04 marks each with sub-parts. SECTION – A Select and write one most appropriate option out of the four options given for each of the questions 1 – 20 B Iron (II) Chloride 1.       Sodium A Hydrogen C Ammonium  1 Chloride Chloride Chloride D Lead Chloride Here, A, B, C and D respectively are: 1 (a) A = Conc. HCl; B = Fe; C = NH4OH; D = PbO (b) A = Conc. H2SO4; B = Fe; C = NH4OH; D = Pb(NO3)2 (c) A = Conc. H2SO4; B = Fe; C = NH3; D = Pb(NO3)2 (d) A = Conc. HCl; B = Fe; C = NH3; D = PbO 2. Which one of the following processes involve chemical reactions? (a) Storing of oxygen gas under pressure in a gas cylinder (b) Liquefaction of air (c) Keeping petrol in a china dish in the open (d) Heating copper wire in presence of air at high temperature NBSE 2023 2

3. Calcium oxide reacts vigorously with water to produce slaked lime. 1 CaO(s) + H2O(l) → Ca(OH)2(aq). This reaction can be classified as: (A) Combination reaction (B) Exothermic reaction (C) Endothermic reaction (D) Oxidation reaction Which of the following is a correct option? (a) (A) and (C) (b) (C) and (D) (c) (A), (C) and (D) (d) (A) and (B) 4. Which of the following statements is correct about an aqueous solution of an acid and of a base? 1 I. Higher the pH, stronger the acid II. Higher the pH, weaker the acid III. Lower the pH, stronger the base IV. Lower the pH, weaker the base (a) I and III (b) II and III (c) I and IV (d) II and IV Q5. A reactive metal (M) is treated with H2SO4 (dil). The gas is evolved and is collected over the water as shown in the figure. 1 The correct conclusion drawn is/are (a) the gas is hydrogen (b) the gas is lighter than air (c) the gas is SO2 and is lighter than air 1 (d) Both (a) and (b) 6. Which of the following salts do not have the water of crystalisation? (I) Bleaching Powder (II) Plaster of Paris (III) Washing soda (IV) Baking soda (a) (II) and (IV) (b) (I) and (III) (c) (II) and (III) (d) (I) and (IV) 7. The correct structural formula of butanoic acid is 1 HH HO HHH HO || || | | | | || (a) H—C—C — C—C—OH (b) H—C—C—C—C—C—OH | ||||| H HHHHH HHH H HHH O ||| | | | | || (c) H—C—C—C—C—OH (d) H—C—C—C—C—OH |||| ||| HHHH HHH NBSE 2023 3 P.T.O.

8. Pseudopodia are: 1 (a) small hair-like structures present on unicellular organisms. (b) false feet developed in some unicellular organisms. (c) long, tube-like structures coming out of the mouth. (d) suckers which are attached to the walls of the intestines. 9. A student was asked to write a stepwise procedure to demonstrate that carbon dioxide is necessary for photosynthesis. He wrote the following steps. The wrongly worded step is Green Plant 1 KOH (a) Both potted plants are kept in dark room (a) (b) for at least three days. (b) Bottom of the bell jars is sealed to make them air tight. (c) Both potted plants are kept in sunlight after the strarch test. (d) A leaf from both the plants is taken to test the presence of starch. 10. A Mendelian experiment consisted of breeding tall pea plants bearing violet flowers with short pea plants bearing white flowers. In the progeny, all bore violet flowers, but almost half of them were short. This suggests that the genetic makeup of tall plant can be depicted as 1 (a) TTWW (b) TTww (c) TtWW (d) TtWw 11. Electrical impulse travels in a neuron from 1 (a) Dendrite → axon → axonal end → cell body (b) Cell body → dendrite → axon → axonal end (c) Dendrite → cell body → axon → axonal end (d) Axonal end → axon → cell body → dendrite 12. In the list of organisms given below, those that reproduce by the asexual method are 1 (I) banana (II) dog (III) yeast (IV) amoeba (a) (II) and (IV) (b) (I), (III) and (IV) (c) (I) and (IV) (d) (II), (III) and (IV) 13. Identify the circuit (Fig) in which the electrical components have been properly connected. 1 (I) (II) NBSE 2023 4

+– +– A+ – + A+ – V R V – R – + (III) (IV) (a) (I) (b) (II) (c) (III) (d) (IV) 14. If the key in the arrangement is taken out (the circuit is made open) and magnetic field lines are drawn over the horizontal plane ABCD, the lines are 1 Variable resistance R A A Long straight conductor O B D C K (a) concentric circles (b) elliptical in shape (c) straight lines parallel to each other (d) concentric circles near the point O but of elliptical shapes as we go away from it 15. For a current in a long straight solenoid N- and S-poles are created at the two ends. Among the following statements, the incorrect statement is 1 (a) The field lines inside the solenoid are in the form of straight lines which indicates that the magnetic field is the same at all points inside the solenoid (b) The strong magnetic field produced inside the solenoid can be used to magnetise a piece of magnetic material like soft iron, when placed inside the coil (c) The pattern of the magnetic field associated with the solenoid is different from the pattern of the magnetic field around a bar magnet (d) The N- and S-poles exchange position when the direction of current through the solenoid is reversed 16. In an electrical circuit three incandescent bulbs A, B and C of rating 40 W, 60 W and 100 W respectively are connected in parallel to an electric source. Which of the following is likely to happen regarding their brightness? 1 (a) Brightness of all the bulbs will be the same (b) Brightness of bulb A will be the maximum (c) Brightness of bulb B will be more than that of A (d) Brightness of bulb C will be less than that of B NBSE 2023 5 P.T.O.

Q. no 17 to 20 are Assertion - Reasoning based questions. These 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 and R is not the correct explanation of A (c) A is true but R is false (d) A is false but R is true 17. Assertion: A compass needle gets deflected when electric current is passed through the nearby metallic wire. Reason: The S.I unit of magnetic field strength is Oersted. 1 18. Assertion: If one bacterium divides then two resultant bacteria divide again to generate four individual bacteria which will be highly identical. Reason: It is due to asexual reproduction. 1 19. Assertion: Haemodialysis can save the life of a patient with kidney failure case. Reason: Waste products like urea, uric acid can be removed from the blood by the process of Haemodialysis. 1 20. Assertion: A. The following chemical equation: 2C H + 7 O → 4CO + 3H O 66 2 2 2 2 is a balanced chemical equation. Reason: In a balanced chemical equation, the total number of atoms of each element must be equal on both sides of the equation. 1 SECTION – B Q. no. 21 to 26 are very short answer questions. 21. Mention the names of the metals of the following: (a) Two metals which are alloyed with iron to make stainless steel. (b) Two metals which are used to make jewellery. 2 OR The following observations were made by a student on treating four metals P, Q, R and S with the given salt solutions: Sample MgSO4 (aq) Zn(NO3)2 (aq) CaSO4 (aq) Na2SO4 (aq) P No reaction Reaction occurs Q Reaction occurs Reaction occurs Reaction occurs No reaction R No reaction Reaction occurs S No reaction Reaction occurs Reaction occurs No reaction No reaction No reaction No reaction No reaction NBSE 2023 6

Based on the above observations: (a) Arrange the given samples in the increasing order of reactivity (b) Write the chemical formulae of products formed when Q reacts with CuSO4 solution. 22. Show direction of flow of lymph with the help of flow diagram. 2 23. In a test tube A and B shown below, yeast was kept in sugar solution. What products of respiration would you expect in tubes A and B? 2 Oil film Sugar solution Yeast AB 24. How do autotrophs obtain CO2 and N2 (raw materials) to make their food? 2 25. A student observes the given phenomenon in the lab as a white light passes through a prism. Among many other colours, he observed the position of the two colours red and violet. What is the phenomenon called? What is the reason for the violet light to bend more than the red light? 2 OR What is astigmatism? How can it be corrected? 26. If all the waste we generate is biodegradable, will this have no impact on the environment? 2 SECTION – C Q. no. 27 to 33 are short answer questions. 27. You might have noted copper powder is heated in a China dish, the reddish brown surface of copper powder becomes coated with black substance: (a) Why has black substance formed? (b) What is the black substance? (c) Write the chemical equation for the reaction. (d) How can the black coating be turned reddish brown? 3 28. A student passes electricity through aqueous solution of compound A and B. He finds that solution of A do not conduct electricity while solution of B conducts electricity. State the type of both solutions and explain why solution of B conducts electricity. Give an example of solution which can conduct electricity. 3 29. (a) Name the blood vessel that brings deoxygenated blood to the human heart. 3 (b) Which chamber of the human heart receives deoxygenated blood ? NBSE 2023 7 P.T.O.

(c) Describe how deoxygenated blood from this chamber is sent to lungs for oxygenation. OR Complete the following flow chart as per the given instructions: Gastric Glands Present in the wall of Stomach Secretions a b c Function Function Function d e f 30. The nature, size and position of image of an object produced by a lens or mirror are as shown below. Identify the lens/mirror (X) used in each case and draw the corresponding complete ray diagram (size of object is about half of the image.) 3 31. Show the path of the reflected ray, after reflection in each case. 3 F FF 32. What are magnetic field lines? How is the direction of a magnetic field at a point determined? 3 OR For the circular coil carrying current shown below draw magnetic field lines. Decide which of its face behaves as north pole and which face behaves as south pole. Give reason to justify your answer. NBSE 2023 8

33. What term do you use for trophic levels comprising of 3 (a) the organisms which make their own food (b) animals feeding on plant matter only (c) organisms breaking down dead plants and animals SECTION – D Q. no. 34 to 36 are Long answer questions. 5 34. Observe the diagram and answer the following questions: (a) Identify 'A'. What happens to calcium hydroxide when gas 'A' is passed through it? (b) Name the functional group present in C2H4O2. (c) Write the chemical equation for the reaction of C2H4O2 with sodium carbonate. (d) Write one property of C2H4O2 which differentiates it from ethanol. (e) The compound C2H4O2 reacts with ethanol in the presence of sulphuric acid. Write the chemical equation involved. OR The molecular formula of two carbon compounds are C4H8 and C3H8. Which one of the two is most likely to show addition reaction? Justify your answer. Also give the chemical equation to explain the process of addition reaction in this case. 35. (a) (i) Write full form of DNA. (ii) State the role of DNA in the cell nucleus. (iii) What will be the effect if the information of the DNA is changed? (b) Explain the importance of DNA copying in reproduction. 5 OR Identify the following methods and give one example of each: (a) Process in which reproduction takes place by breaking up of parent into several fragments. (b) Process of dividing of organisms into many cells simultaneously. (c) Process of reproduction by formation of bud on the parent body. (d) Process of reproduction by formation of spores. (e) Process used by multi-cellular organisms to reproduce by cutting into many pieces and each piece forms a new individual. NBSE 2023 9 P.T.O.

36. (a) Draw the pattern of magnetic field lines through bar-magnet and around a current carrying solenoid. 5 (b) What is the pattern of magnetic field lines inside the solenoid and what does these indicate? (c) How can a solenoid be utilised to make an electromagnet? (d) State two ways by which the strength of this electromagnet can be increased. SECTION – E Q. no. 37 to 39 are case - based/data -based questions with 2 to 3 short sub - parts. Internal choice is provided in one of these sub-parts. 37. The graph below show the rate of reaction of three different metals X, Y and Z with dilute sulphuric acid. 4 (a) Out of Al, Mg, Fe which will respresent Z? Support your answer with valid reason. (b) If X, Y and Z in the graph are metals among Al, Mg, Zn and Cu then which of these metals is represented by ‘Y’? Explain. OR When Mg reacts with dil H2SO4, it evolves H2 gas, but what happened when it reacts with very dilute HNO3? 38. Sex of an individual is determined by different factors in various species. Some animals rely entirely on the environmental cues, while in some other animals the individuals can change their sex during their life time indicating that sex of some species is not genetically determined. However, in human beings, the sex of an individual is largely determined genetically. 4 (a) In what way are the sex chromosomes ‘X’ and ‘Y’ different in size? Name the mismatched pair of sex chromosome in humans. (b) Write the number of chromosomes present in human beings apart from sex chromosomes. Which of the parent has a mismatched pair of sex chromosomes? (c) Citing two examples, justify the statement “Sex of an individual is not always determined genetically”. NBSE 2023 10

OR Draw a flow chart to show that sex is determined genetically in human beings. 39. The following diagram is of the solar furnace. It is used to generate heat using sun radiation. The solar furnace consists of flat solar tracking heliostat, a parabolic collecting mirror, an attenuator or shutter, and the test zone area. 4 Concentrator Attenuator Heliostat (a) State the material that can be used as a heliostat surface to reflect maximum radiation. (b) Name the parabolic mirror used in the solar furnace. (c) Explain how high temperature is achieved by solar furnaces. OR How can you identify the type of mirrors without touching? NBSE 2023 11 P.T.O.