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CBSE Class X 2007 : SCIENCE & TECHNOLOGY

7 pages, 93 questions, 1 questions with responses, 1 total responses,

CBSE 10
Kendriya Vidyalaya (KV), Kamla Nehru Nagar, Ghaziabad

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Roll No. jksy uaCode No. Series RKM/2 dksM ua- 31/2/1 Please check that this question paper contains 7 printed pages. Code number given on the right hand side of the question paper should be written on the title page of the answer-book by the candidate. Please check that this question paper contains 24 questions. Please write down the serial number of the question before attempting it. i;k tk p dj ysa fd bl iz'u&i=k esa eqfnzr i`"B 7 gSaA iz'u&i=k esa nkfgus gkFk dh vksj fn, x, dksM uEcj dks Nk=k m kj&iqfLrdk ds eq[k&i`"B ij fy[ksaA i;k tk p dj ysa fd bl iz'u&i=k esa 24 iz'u gSaA i;k iz'u dk m kj fy[kuk 'kq: djus ls igys] iz'u dk ekad vo'; fy[ksaA SCIENCE AND TECHNOLOGY (Theory) foKku ,oa izkS|ksfxdh lS)kfUrd Time allowed : 2 hours Maximum Marks: 60 fu/kkZfjr le; % 2 ?k.Vs vf/kdre vad % 60 General Instructions : (i) The question paper comprises of two sections, A and B. You have to attempt both the sections. (ii) You are advised to attempt all the questions of Section A and Section B separately. (iii) All questions are compulsory. (iv) There is no overall choice. However, internal choice has been provided in some questions. You are to attempt only one option in such questions. (v) Marks allocated to every question are indicated against it. (vi) Questions number 1-4 in Section A and 17, 18 in Section B are very short answer questions. These are to be answered in one word or one sentence. (vii) Questions number 5-8 in Section A and 19, 20 in Section B are short answer questions. These are to be answered in 30 - 40 words each. (viii) Questions number 9-14 in Section A and 21 - 23 in Section B are also short answer questions. These are to be answered in 40 - 50 words each. (ix) Questions number 15, 16 in Section A and 24 in Section B are long answer questions. These are to be answered in 70 words each. 31/2/1 1 P.T.O. lkekU; funsZ'k % (i) bl iz'u&i=k ds nks [k.M] v ,oa c gSaA vkidks nksuksa [k.Mksa ds iz'uksa ds m kj nsus gSaA (ii) vkidks fdlh ,d [k.M ds lHkh iz'uksa ds m kj ,d lkFk fy[kus ds i'pkr~ gh nwljs [k.M ds iz'uksa ds m kj nsus gSaA (iii) lHkh iz'u vfuok;Z gSaA (iv) bl iz'u&i=k esa dksbZ O;kid p;u ugha gSA rFkkfi dqN iz'uksa esa oSdfYid vUr% p;u miyC/k gSaA ,sls iz'uksa esa vkidks fn, x, p;u esa ls dsoy ,d iz'u gh djuk gSA (v) izR;sd iz'u ds fy, fu;r vad mlds lkeus n'kkZ, x, gSaA (vi) [k.M v ds iz'u la[;k 1&4 rFkk [k.M c ds iz'u la[;k 17] 18 vfr y?kq m kj izdkj ds iz'u gSaA bu iz'uksa ds m kj ,d 'kCn rFkk ,d okD; esa nsus gSaA (vii) [k.M v ds iz'u la[;k 5&8 rFkk [k.M c ds iz'u la[;k 19] 20 y?kq m kj izdkj ds iz'u gSaA buesa izR;sd ds m kj 30&40 'kCnksa esa nsus gSaA (viii) [k.M v ds iz'u la[;k 9&14 rFkk [k.M c ds iz'u la[;k 21&23 Hkh y?kq m kj izdkj ds iz'u gSaA buesa izR;sd ds m kj 40&50 'kCnksa esa nsus gSaA (ix) [k.M v ds iz'u la[;k 15] 16 rFkk [k.M c dk iz'u la[;k 24 nh?kZ m kj izdkj ds iz'u gSaA buesa izR;sd ds m kj 70 'kCnksa esa nsus gSaA SECTION A [k.M v 1. The pH values of three solutions A, B and C having equal molar concentration are respectively 2.0, 7.0 and 13.0 at 298 K. Which of the three solutions represents an acid solution ? 1 rhu foy;uksa A, B vkSj C dh eksyj lkUnzrk leku gS ijUrq muds pH eku 298 K rki ij e'k% 2.0, 7.0 vkSj 13.0 gSaA bu rhu foy;uksa esa ls dkSulk vEyh; foy;u dks iznf'kZr djrk gS \ 2. Write the chemical formula of simplest ketone. 1 lcls ljy dhVksu dk jklk;fud lw=k fyf[k,A 3. Why is our galaxy called Milky Way ? 1 gekjh xSysDlh dks ^nqXk es[kyk* feYdh os D;ksa dgrs gSa \ 4. If the distance between two electric charges is doubled, how much will the force exerting between them change to ? ;fn nks fo|qr~ vkos'kksa ds chp dh nwjh nqxquh dj nh tk,] rks muds chp yxus okyk cy fdl izdkj ifjofrZr gks tk,xk \ 31/2/1 2 1 5. State four characteristic features of Dynamic Equilibrium . 2 ^xfrd lkE;* ds pkj vfHkyk{kf.kd y{k.k fyf[k,A 6. What is Fehling s reagent ? What would you observe on heating formalin with Fehling s reagent in a test tube ? 2 Q+sfyax vfHkdeZd D;k gS \ Q+kWesZfyu dks Q+sfyax vfHkdeZd ds lkFk ,d ij[kuyh esa xje djus ij vki D;k izsf{kr djsaxs \ 7. Distinguish between a geosynchronous and a polar satellite. What is the usual time period of a (a) geosynchronous satellite ? (b) polar satellite ? 2 ^Hkw&rqY;dkyh* vkSj ^/kqzoh;* mixzg esa Hksn dhft,A fuEufyf[kr ds lkekU; vkorZ&dky dk eku D;k gS % v Hkw&rqY;dkjh mixzg c /kzqoh; mixzg 8. An electric heater is used on 220 V supply and takes a current of 3.4 A. Calculate (i) its power and (ii) its resistance, when it is in use. 2 ,d fo|qr~ ghVj dk mi;ksx 220 V dh lIykbZ ls djus ij mlesa 3.4 A fo|qr~ /kkjk izokfgr gksrh gSA mi;ksx fd, tkrs le; ghVj (i) dh 'kf vkSj (ii) mldk izfrjks/k] ifjdfyr dhft,A 9. What is Plaster of Paris chemically ? How is it obtained from gypsum ? Write the condition and chemical equation involved in its manufacture. 3 jklk;fud :i ls ^IykLVj vkWQ isfjl* D;k gS \ bldks ftIle ls fdl izdkj izkIr djrs gSa \ blds mRiknu ls lEcfU/kr 'krZ rFkk jklk;fu;d lehdj.k fyf[k,A 10. Define the term, allotropy . In which kind of properties are the two allotropes of an element (i) similar, (ii) different ? How can the two allotropes of sulphur be distinguished from one another ? 3 ^vij:irk* 'kCn dh ifjHkk"kk fyf[k,A fdlh r o ds nks vij:i fdl izdkj ds xq.kksa esa (i) leku] (ii) fHk gksrs gSa \ lYQ+j ds nksuksa vij:iksa dh igpku fdl izdkj dh tk ldrh gS \ 11. Give reasons for the following : 3 (i) Alcohol supplied for industrial purposes is mixed with poisonous substances like copper sulphate. (ii) The reaction CH3COONa + NaOH CH4 + Na2CO3 is classified as a decarboxylation reaction. (iii) Formalin is used for preserving biological specimens. 31/2/1 3 P.T.O. fuEufyf[kr dk dkj.k Li"V dhft, % (i) vkS|ksfxd dk;ks ds fy, vkiwfrZ dh tkus okyh ,sYdksgkWy esa dkWij lYQsV tSls fo"kk inkFkZ feyk, tkrs gSaA (ii) vfHkf ;k CH3COONa + NaOH CH4 + Na2CO3 dks fodkcksZfDlyhdj.k vfHkf ;k ds :i esa oxhZ r fd;k tkrk gSA (iii) Q+kWesZfyu dk mi;ksx tSfod izfrn'kks ds ifjj{k.k ds fy, fd;k tkrk gSA 12. A convex mirror used on a bus has a focal length of 200 cm. If a scooter is located at 400 cm from this mirror, find the position, nature and magnification of the image formed in the mirror. 3 fdlh cl esa mi;ksx vkus okys m ky niZ.k dh Q+ksdl nwjh 200 cm gSA ;fn bl niZ.k ls fdlh LdwVj dh nwjh 400 cm gS] rks niZ.k esa cus LdwVj ds izfrfcEc dh fLFkfr] iz fr ,oa vko/kZu Kkr dhft,A 13. (a) What is a solar cell ? (b) Why is bio-gas considered an ideal fuel for domestic use ? (c) Name a device in which controlled chain reaction is used. 3 v ^lkSj lsy* fdls dgrs gSa \ c tSo&xSl ck;ksxSl dks ?kjsyw mi;ksx ds fy, ,d vkn'kZ b /ku D;ksa ekuk tkrk gS \ l ,d ,slh ;qf dk uke crkb, ftlesa fu;fU=kr Ja`[kyk vfHkf ;k dk mi;ksx gksrk gSA 14. (a) Define the term, electroplating . (b) With a labelled diagram describe an activity to show copper plating on a metal spoon. 3 v ^fo|qr~&ysiu* 'kCn dh ifjHkk"kk fyf[k,A c ukekafdr fp=k dh lgk;rk ls fdlh /kkrq ds pEep ij dkWij ds ysiu dks n'kkZus okys f ;kdyki dk o.kZu dhft,A 15. (a) Write the name and formula of the main ore of aluminium. (b) What is alumina ? Which reducing agent is used for the reduction of alumina ? (c) Draw a diagram of the electrolytic cell used in the reduction of alumina. Label anode and cathode on it. (d) Why is alumina dissolved in cryolite ? 5 OR 31/2/1 4 (a) What is an alloy ? How is an alloy made ? (b) Name an alloy (i) which has a lower melting point than its constituents. (ii) which is more hard, tough and strong than its constituents. (c) Name the constituents of the alloy, Magnalium . Write its two uses. 5 v ,syqfefu;e ds eq[; v;Ld dk uke rFkk lw=k fyf[k,A c ,syqfeuk D;k gS \ ,syqfeuk ds vip;u esa fdl vipk;d dk mi;ksx gksrk gS \ l ml fo|qr~&vi?kVuh lsy dk vkjs[k [khafp, ftldk mi;ksx ,syqfeuk ds vip;u esa fd;k tkrk gSA bl vkjs[k ij ,suksM rFkk dSFkksM ukekafdr dhft,A n ,syqfeuk dks k;ksykbV esa D;ksa ?kksyrs gSa \ vFkok v feJ/kkrq fdls dgrs gSa \ ;g dSls cuk;k tkrk gS \ c ,slh feJ/kkrq dk uke crkb, (i) ftldk nzo.kkad mlds la?kVdksa ds nzo.kkad ls de gksrk gSA (ii) tks vius la?kVdksa dh rqyuk esa vf/kd dBksj] et+cwr pheM+ ,oa 'kf 'kkyh gksrk gSA l ^eSXusfy;e* feJ/kkrq ds la?kVdksa ds uke fyf[k,A blds nks mi;ksx fyf[k,A 16. Name the four common defects of vision and state the cause of each defect. A person cannot see distinctly objects placed beyond 2 metres. State the nature and focal length of the lens which could be used to correct this defect. 5 OR (a) Describe with diagram an experiment to show that a force is exerted on a current carrying conductor when placed perpendicular in a magnetic field. (b) State the rule to find the direction of the force exerted on a current carrying conductor in a magnetic field. 5 pkj lkekU; n`f"V&nks"kksa ds uke fyf[k, rFkk izR;sd nks"k ds gksus dk dkj.k Hkh fyf[k,A ,d euq"; 2 ehVj ls vf/kd nwjh ij j[kh oLrqvksa dks Li"V ugha ns[k ldrk gSA ml ysal dh iz fr rFkk Q+ksdl nwjh fyf[k, ftlds mi;ksx }kjk bl nks"k dk la'kks/ku fd;k tk ldrk gSA vFkok v vkjs[k dh lgk;rk ls ,d iz;ksx dk o.kZu dhft, tks ;g n'kkZ lds fd fdlh pqEcdh; {ks=k esa ml {ks=k ds yEcor~ j[kk dksbZ /kkjkokgh pkyd cy dk vuqHko djrk gSA c fdlh pqEcdh; {ks=k esa j[ks /kkjkokgh pkyd ij yxus okys cy dh fn'kk Kkr djus dk fu;e fyf[k,A 31/2/1 5 P.T.O. SECTION B [k.M c 17. What is meant by translocation with respect to transport in plants ? 1 ikS/kksa esa ifjogu ds lanHkZ esa ^LFkkukarj.k* dk D;k vFkZ gS \ 18. What is a ganglion ? 1 ^raf=kdk xqPN* D;k gS \ 19. Anil has blood group A while Om has blood group O . (a) Persons of which blood group(s) can receive blood from (i) Anil and (ii) Om ? (b) Who can donate blood to (i) Anil and (ii) Om ? 2 OR Draw the human heart and label (i) Aorta and (ii) Coronary artery on it. 2 vfuy dk #f/kj oxZ A rFkk vkse dk #f/kj oxZ O gSA v fdl&fdl #f/kj oxZ ds O;f (i) vfuy ls rFkk (ii) vkse ls #f/kj izkIr dj ldrs gSa \ c dkSu j nku dj ldrk gS (i) vfuy dks (ii) vkse dks \ vFkok ekuo n; dk vkjs[k [khafp, rFkk ml ij (i) egk/keuh vkSj (ii) n~&/keuh ukekafdr dhft,A 20. What is autonomic nervous system ? Name the subsystems in which it is subdivided. 2 Lok; k raf=kdk ra=k fdls dgrs gSa \ mu mira=kksa raf=kdkvksa ds uke fyf[k, ftuesa bls izfoHkkftr fd;k x;k gSA 21. (a) How is the process of binary fission different from budding ? (b) What is grafting ? (c) List two advantages of vegetative propagation. OR Draw a diagram to illustrate fertilization in a flowering plant and label the following in it : (a) Pollen grains (b) Egg v f}&fo[k.Mu dh izf ;k eqdqyu ls fdl :i esa fHk gksrh gS \ c dye&yxkuk fdls dgrs gSa \ l dkf;d izo/kZu ds nks ykHk fyf[k,A vFkok iq"ih ikni esa fu"kspu n'kkZus ds fy, ,d vkjs[k [khafp, vkSj mlesa fuEufyf[kr dks ukekafdr dhft, % v ijkxd.k c vaMs 31/2/1 6 3 3 22. How is the sex of the offspring determined in the zygote ? Explain. 3 ;qXeut esa larfr ds fyax ds fu/kkZj.k dh f ;k le>kb,A 23. Distinguish between Conservation and Preservation . Suggest any four practices which may help in protecting our environment. 3 ^laj{k.k* vkSj ^ifjj{k.k* esa Hksn dhft,A i;kZoj.k laj{k.k esa lgk;d dksbZ pkj vkpj.k lq>kb,A 24. (a) Draw the respiratory system of human beings. (b) Label the following on the diagram drawn : Larynx, Trachea, Primary Bronchus, Lungs. (c) What happens to the carbon dioxide which collects in human tissues ? 5 v ekuo 'olu&ra=k dk vkjs[k [khafp,A c [khaps x, vkjs[k ij fuEufyf[kr dks ukekafdr dhft, % daB] 'okluyh] iz/kku 'oluh] QqIQqlA l ekuo rdksa esa ,df=kr dkcZu MkbvkWDlkbM dk D;k gksrk gS \ 31/2/1 7 P.T.O.

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