CBSE Class 10 Science Question Paper SA 1 2011 (4)

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  Page 1  of 18   SUMMATIVE ASSESSMENT - I (2011) Lakdfyr ijh{kk& I (2011)  SCIENCE   /  foKku Class  –  X / &  X   Time allowed : 3 hours Maximum Marks : 80 fu/kkfjr le; 3 ?k.V vf/kdre vd 80 General Instructions : i). The question paper comprises of two sections, A and B. You are to attempt both the sections. ii). All questions are compulsory. iii). There is no overall choice. However, internal choice has been provided in all the five questions of five marks category. Only one option in such questions is to be attempted. iv). All questions to section A and all questions of section B are to be attempted separately. v). Questions 1 to 4 in section A are one mark questions. These are to be answered in one word or one sentence. vi). Questions 5 to 13 in section A are two marks questions. These are to be answered in about 30 words each. vii). Questions 14 to 22 in section A are three marks questions. These are to be answered in about 50 words each. viii). Questions 23 to 25 in section A are five marks questions. These are to be answered in about 70 words each. ix). Questions 26 to 41 in section B are multiple choice questions based on practical skills. Each question is a one mark question. You are to select one most appropriate response out of the four provided to you. lkekU; fun”k (i)   bl iz”u i= dks nks Hkkxks a ,   Hkkx v vkSj Hkkx c es a ckaVk x;k gSA vkidks nksuksa Hkkxks a ds iz”uks a ds mRrj fy[kus gS aA   (ii)    lHkh iz”u vfuok;Z gS aA   (iii)   iw  js iz”u i= ij dksbZ p;u izkIr ugha gS ijUrq ikap&ikap vadks ds ikWap iz”uksa es a Hkhrjh p;u fn;k x;k gSA bu iz”uks a es a  vki dsoy ,d Hkhrjh p;u dks mRrj fy[kus ds fy, pqu ldrs gSaA (iv)   vkidks Hkkx v vkS j Hkkx c ds lHkh iz”uks a ds mRrj i`Fkd&i`Fkd fy[kus gks axsA   (v)   Hkkx v ds iz”u la[;k 1 ls  4 ds iz”u ,d&,d vad ds gS a aA buds mRrj ,d “kCn vFkok ,d okD; es a nsaA   (vi)   Hkkx v ds iz”u la[;k 5 ls 13 ds iz”u nks&nks vadks a ds gSaA buds mRrj yxHkx 30&30 “kCnks a es a nsus gSaA   (vii)   Hkkx v ds iz”u la[;k 14 ls 22 ds iz”u rhu&rhu vadksa ds gSaA buds mRrj yxHkx 50&50 “kCnks a es a  nsus gSaA (viii)   Hkkx v ds iz”u la[;k 2 3 ls 25 ds iz”u ikap&ikap vadks a ds gS aA buds mRrj yxHkx 70 “kCnks a es a nsus gSaA  (ix)   Hkkx c ds iz”u la[;k 2 6 ls 41 ds iz”u iz;ksxkRed dkS”ky ij vk/kkfjr cgqfodYih iz”u gS aA izR;sd iz”u ,d vad dk gSA fn, x;s pkj fodYiks a es a ls vkidks ds oy ,d lcls mi;qDr fodYi pquuk gSA   SECTION-A / ' '   570026 DOWNLOADED FROM WWW.STUDIESTODAY.COMDOWNLOADED FROM WWW.STUDIESTODAY.COM DOWNLOADED FROM WWW.STUDIESTODAY.COMDOWNLOADED FROM WWW.STUDIESTODAY.COM   Page 2  of 18   1. State one basic difference between a physical change and a chemical change. 2. A non-metal X exists in two different forms Y and Z. Y is the hardest natural substance, whereas Z is a good conductor of electricity. Identify Y and Z. X Y Z Y Z Y Z 3. List two main constituents of biogas. 4. How is an ammeter connected in a circuit to measure current flowing through it ? 5. The way metals like sodium, magnesium and iron react with air and water is an indication of their relative positions in the „reactivity series‟. Is this statement true ? Justify your answer with examples. 6. Though the compounds such as glucose and alcohol have hydrogen atoms in their molecule yet they are not categorized as acids, why ? 7. Using balanced chemical equation explain the difference between a displacement reaction and a double displacement reaction. 8. Using a suitable chemical equation justify that some chemical reactions are determined by : (i) change in colour, DOWNLOADED FROM WWW.STUDIESTODAY.COMDOWNLOADED FROM WWW.STUDIESTODAY.COM DOWNLOADED FROM WWW.STUDIESTODAY.COMDOWNLOADED FROM WWW.STUDIESTODAY.COM   Page 3  of 18   (ii) change in temperature. (i)(ii) 9. What is saliva ? State its role in the digestion of food. 10. Biogas is considered to be a boon to the farmers. Give reasons. 11. An electric heater draws a current of 10A when connected to a 200 V supply. What current will the heater draw when it is connected to 220 V supply. 200 V 10A 220 V 12. Insulation cover of which colour is conventionally used for earth wire ? Why is an earth wire connected to metallic parts of appliances ? 13. A 9   resistance is cut into three equal parts and connected in parallel. Find the equivalent resistance of the combination. 9   3 14. (a) Classify the following reactions into different types (i) AgNO 3  (aq)  NaCl(aq)    AgCl(s)  NaNO 3 (aq) (ii) CaO(s)  H 2 O    Ca(OH) 2 (iii) 2KClO 3 (s)    2KCl  3O 2  (b)   Which of the above reaction(s) is/are precipitation reaction(s) ? Why is a reaction called precipitation reaction ? DOWNLOADED FROM WWW.STUDIESTODAY.COMDOWNLOADED FROM WWW.STUDIESTODAY.COM DOWNLOADED FROM WWW.STUDIESTODAY.COMDOWNLOADED FROM WWW.STUDIESTODAY.COM   Page 4  of 18   (i) AgNO 3  (aq)  NaCl(aq)    AgCl(s)  NaNO 3 (aq) (ii) CaO(s)  H 2 O    Ca(OH) 2 (iii) 2KClO 3 (s)    2KCl  3O 2   15. (a) What is universal indicator ? (b) Write the chemical equation involved in the preparation of sodium hydroxide. Name the process. (a)   (b)   16. What are the final products of carbohydrates, proteins and fats after their digestion. 17. (a) Which plant hormone is present in greater concentration in the areas of rapid cell division ? (b) Give one example of a plant growth promoter and a plant growth inhibitor. (a) (b) 18. Which organ secrets a hormone when blood sugar rises in our body ? Name the hormone and name one enzyme released by this organ. 19. (a) “The breathing cycle is rhythmic whereas, exchange of gases is a continuous process”. Justify this statement.  (b) What happens if conducting tubes of circulatory system develops a leak ? State in brief, how could this be avoided ? DOWNLOADED FROM WWW.STUDIESTODAY.COMDOWNLOADED FROM WWW.STUDIESTODAY.COM DOWNLOADED FROM WWW.STUDIESTODAY.COMDOWNLOADED FROM WWW.STUDIESTODAY.COM 
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