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CBSE Class X 2007 : SCIENCE & TECHNOLOGY

7 pages, 95 questions, 15 questions with responses, 16 total responses,

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

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Roll No. jksy uaCode No. Series RKM dksM ua- 31/1 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. 31/1 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. What is the role of a catalyst in a chemical reaction ? 1 fdlh jklk;fud vfHkf ;k esa mRizsjd dh D;k Hkwfedk gksrh gS \ 2. Which class of compounds gives a positive Fehling s test ? 1 fdl oxZ ds ;kSfxd ldkjkRed Q+sfyax ijh{k.k nsrs gSa \ 3. Approximately how many stars are there in the Milky Way ? 1 vkdk'k xaxk esa yxHkx fdrus rkjs gSa \ 4. What is meant by the statement, Potential difference between points A and B in an electric field is 1 volt. ? 1 ^^fdlh fo|qr~&{ks=k esa A vkSj B fcUnqvksa ds chp foHkokarj 1 oksYV gSA** bl dFku dk D;k vFkZ gS \ 5. State the Law of Chemical Equilibrium . Write an expression for the equilibrium constant (K) for the reaction, N2 (g) + 3H2(g) 31/1 2 NH3 (g) + 92 kJ 2 2 ^jklk;fud lkE;koLFkk dk fu;e* fyf[k,A N2 (g) + 3H2(g) 2 NH3 (g) + 92 kJ mijks vfHkf ;k ds lkE;koLFkk fLFkjkad (K) ds fy, O;atd fyf[k,A 6. Name the organic acid present in vinegar. Write a chemical equation which represents the commercial method for the preparation of this acid from methanol. 2 fljds esa mifLFkr dkcZfud vEy dk uke fyf[k,A esFkSukWy ls bl vEy ds okf.kfT;d mRiknu dh fof/k dks n'kkZus okyk jklk;fud lehdj.k fyf[k,A 7. Distinguish between artificial and natural satellites. Why are artificial satellites called eyes in the sky ? 2 ^ f=ke* ,oa ^izk frd* mixzgksa esa Hksn dhft,A f=ke mixzgksa dks ^^vkdk'k esa us=k** D;ksa dgrs gSa \ 8. An electric lamp is marked 100 W, 220 V. It is used for 5 hours daily. Calculate (i) its resistance while glowing. (ii) energy consumed in kWh per day. 2 ,d fo|qr~ ySEi ij 100 W, 220 V vafdr gSA bldk mi;ksx izfrfnu 5 ?k.Vs gksrk gSA ifjdfyr dhft, % (i) (ii) 9. tyrs le; ySEi dk izfrjks/kA izfrfnu [kpZ dh xbZ tkZ kWh esaA (a) Write the chemical name and formula of bleaching powder. (b) Why does bleaching powder smell of chlorine when exposed to air ? (c) Write chemical equation to represent the action of dilute hydrochloric acid on bleaching powder. 3 (a) fojatd pw.kZ dk jklk;fud uke rFkk lw=k fyf[k,A (b) gok esa [kqyk NksM+us ij fojatd pw.kZ ls Dyksjhu dh xa/k D;ksa vkrh gS \ (c) ruq gkbM ksDyksfjd vEy dh fojatd pw.kZ ij f ;k n'kkZus ds fy, jklk;fud lehdj.k fyf[k,A 10. What is meant by dehydrating agent ? Describe with a chemical equation, an activity to show that concentrated sulphuric acid is a strong dehydrating agent. 3 ^futZyhdkjd* dk D;k vFkZ gS \ lkUnz lY +;wfjd vEy ,d izcy futZyhdkjd gS] ;g n'kkZus ds fy, jklk;fud lehdj.k lfgr ,d f ;kdyki dk o.kZu dhft,A 31/1 3 P.T.O. 11. Give reasons for the following : 3 (i) Oxidation of ethanol with CrO3 produces ethanal while ethanol when oxidised with alkaline KMnO4 produces ethanoic acid. (ii) Propanone forms addition product with HCN. (iii) Alcohol supplied for industrial purposes is mixed with copper sulphate. fuEufyf[kr ds fy, dkj.k Li"V dhft, % (i) ,FksukWy dk CrO3 ds lkFk vkWDlhdj.k djus ij ,FkSuy curk gS tcfd ,FksukWy dk {kkjh; KMnO4 ds lkFk vkWDlhdj.k djus ij ,FksukWbd vEy curk gSA (ii) izksusuksu HCN ds lkFk ladyu mRikn cukrk gSA (iii) vkS|ksfxd dk;ks ds fy, vkiwfrZ dh tkus okyh ,sYdksgkWy esa dkWij lYQsV fefJr gksrk gSA 12. An object 50 cm tall is placed on the principal axis of a convex lens. Its 20 cm tall image is formed on the screen placed at a distance of 10 cm from the lens. Calculate the focal length of the lens. 3 ,d 50 cm ph oLrq fdlh m ky ysal ds eq[; v{k ds yEcor~ j[kh gSA mldk 20 cm pk izfrfcEc ysal ls 10 cm nwj j[ks insZ ij curk gSA ysal dh Q+ksdl nwjh ifjdfyr dhft,A 13. (a) State one limitation of solar energy available from solar cells. (b) What is the minimum wind velocity required to obtain useful energy with a windmill ? (c) Define the term nuclear fission . 3 v lkSj lsyksa ls miyC/k gksus okyh lkSj tkZ ,d ,d lhek fyf[k,A c iou&pDdh ls mi;ksxh tkZ izkIr djus ds fy, iou osx dk U;wure eku fdruk gksuk pkfg, \ l ^ukfHkdh; fo[k.Mu* in dh ifjHkk"kk fyf[k,A 14. (a) State Ohm s Law. (b) Draw a schematic diagram of the circuit for studying Ohm s Law. 3 v vkse dk fu;e fyf[k,A c vkse ds fu;e ds v/;;u ds fy, fo|qr~ ifjiFk dk O;oLFkk vkjs[k [khafp,A 15. (a) Name the chief ore of iron. Write its formula. (b) How is an iron ore concentrated ? Describe it briefly. (c) Draw a labelled diagram of the blast furnace used in the extraction of iron from its concentrated ore. OR (a) Draw a labelled diagram of Frasch process used for extracting sulphur. (b) State the principle involved in the extraction of sulphur directly out of the ground. 31/1 4 5 v vk;ju ds eq[; v;Ld dk uke rFkk lw=k fyf[k,A c vk;ju ds v;Ld ds lkUnz.k dh fof/k dk laf{kIr o.kZu dhft,A l lkfUnzr v;Ld ds vk;ju ds fu"d"kZ.k esa mi;ksx vkus okyh okR;k Hk h dk ukekafdr vkjs[k [khafp,A vFkok v lYQ+j fu"d"kZ.k ds ^ k'k&iz e* dk ukekafdr vkjs[k [khafp,A c lYQ+j dks lh/ks Hkw&i`"B ds uhps ls fu"df"kZr djus dh fof/k dk fl)kUr fyf[k,A 16. A 14-year old student is not able to see clearly the questions written on the blackboard placed at a distance of 5 m from him. (a) Name the defect of vision he is suffering from. (b) With the help of labelled ray diagrams show how this defect can be corrected. (c) Name the type of lens used to correct this defect. 5 OR (a) What is an electromagnet ? (b) List any of its two uses. (c) Draw a labelled diagram to show how an electromagnet is made. (d) What is the purpose of the soft iron core used in making an electromagnet ? 14 o"kZ dk dksbZ fo|kFkhZ 5 m nwjh ij fLFkr ';kei ij fy[ks iz'uksa dks Li"V ugha ns[k ikrk gSA v ml n`f"V nks"k dk uke fyf[k, ftlls og fo|kFkhZ ihfM+r gSA c ukekafdr fdj.k vkjs[kksa dh lgk;rk ls n'kkZb, fd bl nks"k dk la'kks/ku fdl izdkj fd;k tk ldrk gSA l bl nks"k ds la'kks/ku esa fdl izdkj ds ysal dk mi;ksx gksrk gS \ vFkok v fo|qr~&pqEcd D;k gS \ c blds dksbZ nks mi;ksx fyf[k,A l fo|qr~&pqEcd cukus dh fof/k n'kkZus ds fy, ,d ukekafdr vkjs[k [khafp,A n fo|qr~&pqEcd dks cukus esa ueZ yksgs ds ksM dk mi;ksx D;ksa fd;k tkrk gS \ 31/1 5 P.T.O. SECTION B [k.M c 17. Name the excretory unit of a kidney. 1 o`Dd dh mRltZu bdkbZ dk uke fyf[k,A 18. What are phytohormones ? 1 ikni&gkWeksZu D;k gSa \ 19. Point out two differences between an artery and a vein. 2 OR What is osmoregulation ? How does it take place in humans ? /keuh ,oa f'kjk esa nks vUrj fyf[k,A vFkok ^ijklj.k&fu;eu* D;k gS \ ekuo esa ;g fdl izdkj dk;kZfUor gksrk gS \ 20. Explain reflex action with a suitable example. 2 ^izfrorhZ f ;k* dks mi;q mnkgj.k }kjk Li"V dhft,A 21. Explain double fertilization in plants. 3 ikS/kksa esa f}fu"kspu Li"V dhft,A 22. (a) What is a gene ? (b) Where are genes located ? (c) What is the nature of gene ? 3 OR Define evolution . Describe Darwin s theory of evolution. v thu D;k gS \ c thu dgk fLFkr gksrs gSa \ l thu dh iz fr D;k gS \ vFkok ^fodkl* dh ifjHkk"kk fyf[k,A MkfoZu ds fodkl ds fl)kUr dk o.kZu dhft,A 23. What is soil erosion ? Mention its any two effects. Suggest two ways by which soil erosion can be checked. ^e`nk vijnu* D;k gS \ blds dksbZ nks izHkko fyf[k,A e`nk vijnu dks jksdus ds nks mik; lq>kb,A 31/1 6 3 24. (a) Draw a diagram of human alimentary canal . (b) Label the following on the diagram drawn : Oesophagus, Liver, Gall bladder, Duodenum (c) What is the function of liver in the human body ? 5 v ekuo ds ^vkgkj uky* dk ,d vkjs[k [khafp,A c [khaps x, vkjs[k esa fuEufyf[kr ukekafdr dhft, % xzkluyh] ; r] fi kk'k;] xzg.kh l ekuo 'kjhj esa ; r dk D;k dk;Z gS \ 31/1 7 P.T.O.

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