se WafaeT eT PTT SahaaT OTT Ss RAJAGIRI PUBLIG SCHOOL As DOHA, QATAR First Pre-Board Examination, 2024-25 Science (086) Class X Time: 3 hrs. Max. Marks: 80 Date:, General Instructions: i. This question paper consists of 39 questions in 5 sections. All questions are compulsory. However, internal choice is provided in some questions. A student isexpected to attempt only one of these questions. iii, Section 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 questionsshould be in the range of 30 to 50 words. v Soe aceacon acts of 7 Short Answer type questions carrying 03 marks each. Answers type questions carrying 05 marks each. Answer e of 80 to 120 words. of assessment of 04 marks each out of the four options given for eachof for incorrect response.i in 3 | Which of the following is the correct arrangement of the given metals @ prder of their reactivity? -Zine, Iron, Magnesium, Sodium 8) Zine > Iron > Magnesium > Sodium %) Sodium > Magnesium > Iron > Zinc | ©) Sodium > Zinc > Magnesium > Iron | 9) Sodium > Magnesium > Zinc > Iron | TRE brisk effervescence produced when a pinch of NaiCOs is added to CHsCOOH Ts * | dive to the formation of, a) Ha gas b) CO2 gas |) co i d) CH: gas | Which of the state? ) Na 1s ii) Ca iii) Fe iv) Cu a Siven metals are obtained by clectrolysis of their chlorides in molten a) iandiv b) iii and iv c)iand Aiandit TPOIPFHNotH yy ‘an oxide which dissolves in dilute hydrochloric n of red litmus blue. The element will be: € of enzymes in digestion of food.ix student sets Up an experiment to study human respiration using lime WE, tube and a straw. Lime water is colourless in the absence of CO,and is milky in its presence. The student fills a freshly prepared limewater in a test tube and blows air poe straw into the limewater. It was observed that the solution turns cloudy as shown, J What can be evaluated from this observation? a) oxygen is exhaled during respiration b) glucose is produced during respiration 6) carbon dioxide is exhaled during respiration )_water vapours are produced during respiration TO tthe image shows oxygenated and de-oxygenated blood in the human heart. Fam pert) ‘events that occur when we touch a hotW equal sized individuals. t grows into new ‘that grows into newes ee ee ee 1e image shows the dispersion, Of white light in the priam TajaaTT POTTS Prism White z Y x What will be the colours of X, ¥ and 2? a) X: red; Y: green; Z: violet, violet, Z: red d) X: red; Y: violet; Z: green cass, WT 1 14 | Which of the following graphical representations best illustrates the behavior of an S | ohmic conductor, showcasing the relationship between current (I) and voltage (V) in accordance with Ohm's Law? >) 1 i o aq sv to 7 Tes TS hwo individuals are as shown using geometric shapes. i Fi Arere Gee Crrvemoscoss Ie pore ee damoted by 2% HC” aaa and YW are ome Haan posse emmbinedi ony ter the J ret mals & Semale sHrpring,: cee x" eee Sex wyETT Which group of waste materials can be classified as non-biodegradable? a) plant waste, used tea bags ») polyethene bags, plastic toys ©) used tea bags, paper straw 4) old clothes, broken footwear Question No.17 to 20 consist of two statements — Assertion (A) and Reason (R). Answerthese 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. ©) Ais true but Ris false, d) Ais false but R is true, 17 | Assertion (A): The ores of reactive metals cannot be reduced by carbon. Reason(R): The reactive metals have more affinity for oxygen than carbon. 18 | Assertion (A): A geneticist crosecd two pea plants and got 50% tall and 50% dwarf i a the progeny. ft tt Reason (R}: One plant was heterozygous tall and the other was dwarf. <, ) List two possible causes responsible for this defect immersed in the liquid. Ligudot RS, Copy the diagram and draw the light rays after they pass through the lens. Justify your diagram. @a) If Rita is consuming curd/Yoghurt for lunch, which trophic level in a food chainl should she be considered as occupying? 2 ‘b) Aquariums needs to be cleaned once in a while whereas ponds or lakes do not require any cleaning. Explain, Section-C Question No. 27 to 33 are short answer questions 27 | A brown coloured metal ’ is heated in a china dish to get a compound ‘Q’. Metal P) is found in the atmosphere as in free state. 3 a) Identity P and Q b) Explain the extraction and refining of metal P with the help of a labeled diagram. i yooyes 911904 12186004 728 tion in Show the electron dot structure and covalent bond formatio a) Ethane d) Ethene ©) Ethyne fPomplete the chemical equations 9) 2NaOH + Zu > Y)CHACOOH + NaHico, > ©) Fe203+ 2A1 > Rana participated in the Zonal relay race competition. During the practice session, fe got cramps in his muscles. ‘ased on the above text answer the following questions. ®) Why Rana got cramps in his muscles | Write the pathway involved in this reaction oom sie SOMES) Ac old mnan ig advised by his doctor to take less sugar in his oe pana disease from which the man ig suffering. Mention the hormone due imbalance of which h 'e iS suffering from this disease, Which endocrine gland Secretes this hormone? ) Name the endocrine gland which secretes growth hormone, What will be its effect on a person if there is: ST | When white li away from a converging lens of focal length ee tas -2sem Boum ‘of a ray diagram.resistors RI and R2 and plot the following V-1 graphs. —T 7 “ @) a)Which of the two diagrams correctly represents the labels ‘Series and parallel’ on the plotted curves? b) List any two factors on which the resistance of a conductor depends. c) When a wire of resistance R is cut into two equal parts, the resistance of each .e resistivity of the material? fe = dents perform the experiments on series and parallel combination SFWO"™ f=" part becomes R/2. How does this. alteration affect th¢ ‘33 | a) State (i) right-hand thumb rule, and (ii) Fleming's left-hand rule. +b) Using Fleming's left-hand rule determine the direction of force experienced by a proton, which enters vertically downwards in a uniform magnetic field acting horizontally from west to east as shown in the diagram. ——} > Magnetic Field —>— —> v Proton Section-D ‘Question No. 34 to 36 are long answer questions. 34 , sodium “*X’ is formed ” other than given above. ts role. from a mixture of a compound which is the main i process. This sodium salt has a major role in drous copper sulphate and hydrated copper unsaturated compound? Mention the ‘a ring structure. Give its chemicalyaaa POTTS sst one - ild. Sugge 35°] a) A couple wants to space the birth oftheir second Preventive method which could be observed ; Preane| (i) by the husband (a) Hy nes eae plasmodium. b) State the difference between reproduction in pee her's body. ©) Explain how an embryo gets nourishment inside the mo Wai aeec aed 4) Draw a diagram showing germination of pollen on stigma Pollen tube a Polle: OR Draw and explain the 5 steps involved in nutrition in amoeba. 36 The below image shows a thin lens of. focal length Sm. Fe Fie #) What is the kind of lens shown in the above figure? }) Ifa real inverted image is to be formed by this lens at a distance of 7m from the opticaleenter, then show with calculation where should the object be placed? b) Draw a neatly labelled diagram of the image formation mentioned in the above question. oR a) You have three resistors of resistance RI, R2 and R3, Ifthe total resistance of series and parallel combination of the three resistors are Re ana Rp Teapectvely, write the relationship to determine Rs and Rp in terms of Rl, R2 and R3. 2002 of the two ammeters Al and A2. combination of three resistors? he circuit?SECTION-E ——raearr1 vane Cakes tatar d/data -based questions with 2 to 3 short sub-parts. Provided in one of these sub-parts. eo estion No. 37 to 39 are case-t; ov Internal choice is p Metals react with non-metal lation between them. Ionic generally soluble in watei ae SG gaining electrons, They have a give-and take beverly sien watcranncac rarer are ce ESE epee ora cpa tore enperaieisnced worerone heattanetoness i) Which of the following properties is not generally exhibited ionic compounds? a) Electrical conductivity in molten state. ») Electrical conductivity in solid state ¢) High melting and boiling points. 4d) Solubility in water ii) Ionic compounds are usually solid and hard in nature. This is due to a) Strong forces of attraction between the oppositely charged ions. b) Weak forces of attraction between the oppositely charged ions. ¢) Strong forces of attraction between the same charged ions. 4) Weak forces of attraction between the similarly charged ions. iii) Transfer of one or more valence electrons from a metal to nonmetal takes place in case of: a) Chemical bonding >) molecular bonding ©) ionic bonding 4d) covalent bonding a Ha jy) The atomic number of four elements A, B, C, Dis 6, 8, 10 and 12 respectively. ‘The two elements which can react to form ionic compounds are: a) AandB b) Cand D <) BandD OR ge the physical state of ionic compounds from 1B) is dominant over that for blue eyes (b). A BE Se ‘man, and they have six children. Four of the] ex are blue eyed. us eyed offspring? ee d) Cannot be determined ) Cannot be determined her carries the gene regarding eye orb —d) Bonly he man’s sperm regarding the eye colour? d) Borbcre le os anaes Mate ~ OR ; * iv. Show the cross of Fi and Fa generation: ae \ t took a col 30 Under the guidance of his teacher on a sunny day, & ae surface towards irvor of latge aperture in his hand and directed its 1 oneave mirror om & fe sun. After that he directed the light reflected Lit ‘e served a bright ick sheet of white paper held close to the mirror, He OnE ang ircular spot of light on the paper. Then he moved the mitfo" fine paper, forth gradually until he got the brightest and smallest spor" tad image teacher said this sharp spot of light is, in fact, the ree ve is the focal length f the sun and the distance between the mirror and this imags f this concave mirror. i) How is the principal focus of a concave mirror defined? a) The point where light rays appear to diverge after reflection b) The point on the principal axis where parallel rays. of light converge. c) The center of the spherical surface of the mirror d) The midpoint between the pole and the radius of curvature ii) The distance between the pole and the focus of a concave mirror is 12 cm. 4 What is the radius of curvature of the mirror? a)6cm bj 12cm c} 24cm = d) 36cm iii) What does the experiment with the concave mirror and sunlight demonstrate about the mirror's properties? a) The mirror magnifies the image of the Sun b) The mirror reflects light without focusing it ) The mirror converges parallel rays of light to a single point d) The mirror absorbs all the sunlight iv) A virtual mene eugene iret, when the object f pled a) Between P and F ) ALF ‘c) Between C and F d) atc i OR or produces real, inverted and same sized image, when the nd F atk d)atP