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8IHYWXE

‚¥∑§Á‹Ã ¬⁄UˡÊÊ -I, 2015-16

SUMMATIVE ASSESSMENT – I, 2015-16

ÁflôÊÊŸ / SCIENCE

∑§ˇÊÊ - X / Class – X

ÁŸœÊ¸Á⁄Uà ‚◊ÿ — 3 ÉÊá≈U •Áœ∑§Ã◊ •¥∑§ — 90

Time Allowed : 3 hours Maximum Marks : 90

‚Ê◊Êãÿ ÁŸŒ̧‡Ê — 1. ß‚ ¬˝‡Ÿ ¬òÊ ∑§Ê ŒÊ ÷ʪʥ, ÷ʪ-• •ÊÒ⁄U ÷ʪ-’ ◊¥ ’Ê¥≈UÊ ªÿÊ „Ò– •Ê¬∑§Ê ŒÊŸÊ¥ ÷ʪʥ ∑§ ¬˝‡ŸÊ¥ ∑§ ©ûÊ⁄U Á‹πŸ

„Ò¥– 2. ‚÷Ë ¬˝‡Ÿ •ÁŸflÊÿ¸ „Ò¥– 3. •Ê¬∑§Ê ÷ʪ-• •ÊÒ⁄U ÷ʪ-’ ∑§ ‚÷Ë ¬˝‡ŸÊ¥ ∑§ ©ûÊ⁄U ¬ÎÕ∑§̃§- ¬ÎÕ∑˜§ Á‹πŸ „Ê¥ª– 4. ÷ʪ-• ∑§ ¬˝‡Ÿ ‚¥ïÿÊ 1 ‚ 3 ∑§ ¬˝‡Ÿ ∞∑§-∞∑§ •¥∑§ ∑§ „Ò¥– ߟ∑§ ©ûÊ⁄U ∞∑§ ‡ÊéŒ •ÕflÊ ∞∑§ flÊÄÿ ◊¥ Œ¥– 5. ÷ʪ-• ∑§ ¬˝‡Ÿ ‚¥ïÿÊ 4 ‚ 6 ∑§ ¬˝‡Ÿ ŒÊ- ŒÊ •¥∑§Ê¥ ∑§ „Ò¥– ߟ∑§ ©ûÊ⁄U ‹ª÷ª 30-30 ‡ÊéŒÊ¥ ◊¥ Œ¥– 6. ÷ʪ-• ∑§ ¬˝‡Ÿ ‚¥ïÿÊ 7 ‚ 18 ∑§ ¬˝‡Ÿ ÃËŸ- ÃËŸ •¥∑§Ê¥ ∑§ „Ò¥– ߟ∑§ ©ûÊ⁄U ‹ª÷ª 50-50 ‡ÊéŒÊ¥ ◊¥ Œ¥–

7. ÷ʪ-• ∑§ ¬˝‡Ÿ ‚¥ïÿÊ 19‚ 24 ∑§ ¬˝‡Ÿ ¬Ê°ø-¬Ê°ø •¥∑§Ê¥ ∑§ „Ò¥– ߟ∑§ ©ûÊ⁄U ‹ª÷ª 70-70 ‡ÊéŒÊ¥ ◊¥ Œ¥–

8. ÷ʪ-’ ∑§ ¬˝‡Ÿ ‚¥ïÿÊ 25 ‚ 33 ∑§ ¬˝‡Ÿ ¬˝ÿʪÊà◊∑§ ∑§Ê҇ʋ ¬⁄U •ÊœÊÁ⁄Uà ’„ÈÁfl∑§À¬Ë ¬‡̋Ÿ „Ò¥– ¬˝àÿ∑§ ¬˝‡Ÿ ∞∑§-∞∑§ •¥∑§ ∑§Ê „Ò– ÁŒ∞ ªÿ øÊ⁄U Áfl∑§À¬Ê¥ ◊¥ ‚ •Ê¬∑§Ê ∑§fl‹ ∞∑§ ‚’‚ ©¬ÿÈÄà Áfl∑§À¬ øÈŸŸÊ „Ò–

9. ÷ʪ-’ ∑§ ¬˝‡Ÿ ‚¥ïÿÊ 34 ‚ 36 ∑§ ¬‡̋Ÿ ¬˝ÿʪÊà◊∑§ ∑§Ê҇ʋ ¬⁄U •ÊœÊÁ⁄Uà ŒÊ- ŒÊ •¥∑§Ê¥ ∑§ „Ò– General Instructions : 1. The question paper comprises of two Sections, A and B. You are to attempt both the

sections. 2. All questions are compulsory 3. All questions of Section-A and all questions of Section-B are to be attempted separately. 4. Question numbers 1 to 3 in Section-A are one mark questions. These are to be answered in

one word or in one sentence 5. Question numbers 4 to 6 in Sections-A are two marks questions. These are to be answered

in about 30 words each. 6. Question numbers 7 to 18 in Section-A are three marks questions. These are to be

answered in about 50 words each 7. Question numbers 19 to 24 in Section-A are five marks questions. These are to be

answered in about 70 words each. 8. Question numbers 25 to 33 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.

9. Question numbers 34 to 36 in Section-B are questions based on practical skills. Each question is of two marks.

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÷ʪ-• / SECTION-A

1 ¬˝ÁÃflÃ˸ Á∑˝§ÿÊ ∑§Ë ¬Á⁄U÷Ê·Ê Á‹Áπ∞–

Define reflex action.

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2 ∞∑§ ÿÈÁÄà ∑§Ë ‡ÊÁÄà ∑§Ê •ŸÈ◊ÃÊ¥∑§ 100 W – 250 V „Ò– ß‚ ∑§ÕŸ ‚ ÄÿÊ ¬ÃÊ ø‹ÃÊ „Ò?

The power rating of an appliance is 100W - 250V. What does it indicate?

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3 ©‚ ¬ŒÊÕ¸ ∑§Ê ŸÊ◊ Á‹Áπ∞ Á¡‚∑§ flÊc¬ ‚ʪ⁄UÃʬËÿ ™§¡Ê¸ ‚¥ÿãòÊ ◊¥ ≈U⁄U’Êߟ ∑§Ê ø‹ÊŸ ∑§ Á‹∞ ¬˝ÿÈÄà ∑§Ë ¡ÊÃË „Ò–

Write the name of the substance whose vapours are used to run the turbine of the generator of

ocean thermal energy plant ?

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4 ◊ÎŒÊ A ∑§ pH ∑§Ê ◊ÊŸ 7.5 ÃÕÊ ◊ÎŒÊ B ∑§ pH ∑§Ê ◊ÊŸ 4.5 „Ò– ߟ◊¥ ‚ ∑§ÊÒŸ ‚Ë ◊ÎŒÊ, A•ÕflÊ B, ∑§Ê ©‚∑§ pH

◊ÊŸ ∑§Ê ‚◊ÊÿÊÁ¡Ã ∑§⁄UŸ ∑§ Á‹∞ øÊ∑§ ∑§ øÍáʸ ‚ ©¬øÊÁ⁄Uà Á∑§ÿÊ ¡ÊŸÊ øÊÁ„∞ •ÊÒ⁄U ÄÿÊ¥?

The pH of soil A is 7.5 while that of soil B is 4.5. Which of the two soils A or B should be treated with powdered chalk to adjust its pH and why ?

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5 ¬Œ Á◊üÊÊÃÈ ∑§Ê ¬Á⁄U÷ÊÁ·Ã ∑§ËÁ¡∞– Á◊üÊÊÃÈ ’ŸÊŸ ∑§ ŒÊ ‹Ê÷ Á‹Áπ∞–

Define the term alloy. Give two advantages of making alloys.

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6 (i) ŒÊ ¡ËflÊ¥ ∑§ ŸÊ◊ Á‹Áπ∞ ¡Ê ¬⁄U¡ËflË ¬Ê·∑§ ÿÈÁÄà mÊ⁄UÊ ¬Ê·áÊ ¬˝Êåà ∑§⁄Uà „Ò¥–

(ii) ∑§fl∑§ •¬ŸÊ ¬Ê·áÊ Á∑§‚ ¬˝∑§Ê⁄U ¬˝Êåà ∑§⁄Uà „Ò¥?

(i) Name two organisms that obtain food through parasitic nutritive strategy.

(ii) How do fungi obtain their food ?

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7 (a) ¬ŒÊÕ¸ ‘X’ ∑§ Áfl‹ÿŸ mÊ⁄UÊ ∑§Ê’¸Ÿ «UÊß•ÊÚÄ‚Êß«U ∑§Ê ¬⁄UˡÊáÊ Á∑§ÿÊ ¡ÊÃÊ „Ò– ‘X’ ∑§Ë ∑§Ê’¸Ÿ «UÊß•ÊÚÄ‚Êß«U ‚

•Á÷Á∑˝§ÿÊ ∑§Ê ‚◊Ë∑§⁄UáÊ Á‹Áπÿ–

(b) ‘X’ Á∑§‚ ¬∑̋§Ê⁄U ¬Ê̋åà Á∑§ÿÊ ¡ÊÃÊ „Ò? ⁄UÊ‚ÊÿÁŸ∑§ ‚◊Ë∑§⁄UáÊ Á‹Áπÿ–

(a) A solution of a substance ‘X’ is used for testing carbon dioxide. Write the equation of the

reaction of ‘X’ with carbon dioxide.

(b) How is ‘X’ obtained? Write chemical equation.

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8 ¡‹ ‡ÊÊœ∑§ ‚¥ÿ¥òÊÊ¥ ◊¥, ∞∑§ ‡flà ⁄UÊ‚ÊÿÁŸ∑§ ¬ŒÊÕ¸, Á¡‚◊¥ Ä‹Ê⁄UËŸ ªÒ‚ ∑§Ë ¬˝’‹ ª¥œ „ÊÃË „Ò, ¡‹ ∑§ ≈Ò¥U∑§ ∑§Ê

¡ËflÊáÊÈ„ËŸ ’ŸÊŸ ◊¥ ¬˝ÿÈÄà „ÊÃÊ „Ò– ⁄UÊ‚ÊÿÁŸ∑§ ÿÊÒÁª∑§ ∑§Ë ¬„øÊŸ ∑§ËÁ¡∞– ß‚∑§Ê ⁄UÊ‚ÊÿÁŸ∑§ ŸÊ◊ ∞fl¥ ‚ÍòÊ

Á‹Áπÿ– ß‚∑§ ÁŸ◊ʸáÊ ∑§Ë ⁄UÊ‚ÊÿÁŸ∑§ ‚◊Ë∑§⁄UáÊ ÷Ë Á‹Áπÿ–

In water treatment plants, a white chemical substance having strong smell of chlorine gas is used to

sterilise the water tank. Identify the chemical compound. Write its chemical name and formula. Also

write the chemical equation for its preparation.

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9 (a) ∞∑§ •œÊÃÈ X ŒÊ ÁflÁ÷ÛÊ M§¬Ê¥ Y ÃÕÊ Z ◊¥ ¬ÊÿÊ ¡ÊÃÊ „Ò– Y ∞∑§ ∑§∆UÊ⁄UÃ◊ ¬˝Ê∑ΧÁÃ∑§ ¬ŒÊÕ¸ „Ò ¡’∑§Ë Z

ÁfllÈà ∑§Ê ∞∑§ •ë¿UÊ øÊ‹∑§ „Ò– X, Y, Z ∑§Ë ¬„øÊŸ ∑§ËÁ¡∞–

(b) ∞∑§ Ãàfl, X ,•ÊÚÄ‚Ë¡Ÿ ‚ •Á÷Á∑§̋ÿÊ ∑§⁄U ∞∑§ •ÊÚÄ‚Êß«U XO2 ’ŸÊÃÊ „Ò– ß‚ •ÊÚÄ‚Êß«U ∑§Ê ¡’ ¡‹ ◊¥

ÉÊÊ‹Ê ¡ÊÃÊ „Ò, Ã’ ÿ„ ŸË‹ Á‹≈U◊‚ ∑§Ê ‹Ê‹ ∑§⁄UÃÊ „Ò– Á‹Áπÿ Á∑§ Ãàfl X œÊÃÈ „Ò •ÕflÊ •œÊÃÈ–

(c) ©‚ œÊÃÈ ∑§Ê ŸÊ◊ Á‹Áπÿ Á¡‚ ∑§Ê°‚Ê ’ŸÊŸ ∑§ Á‹∞ ÃÊ¥’ ∑§ ‚ÊÕ Á◊ÁüÊà Á∑§ÿÊ ¡ÊÃÊ „Ò–

(a) 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 X, Y, Z.

(b) An element, X, on reaction with oxygen forms an oxide XO2. The oxide when dissolved in

water turns blue litmus red. State whether element X a is metal or a non-metal.

(c) Name the metal which is alloyed with copper to make bronze.

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10 ÁŸïŸ ¬˝∑§̋◊Ê¥ ◊¥ ⁄UÊ‚ÊÿÁŸ∑§ •Á÷Á∑§̋ÿÊ•Ê¥ ∑§ ¬˝∑§Ê⁄U ∑§Ê ¬„øÊÁŸÿ — 3

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(i) ’Á⁄Uÿ◊ Ä‹Ê⁄UÊß«U Áfl‹ÿŸ ∑§Ê ∑§ÊÚ¬⁄U ‚À»§≈U Áfl‹ÿŸ ◊¥ Á◊ÁüÊà Á∑§ÿÊ ¡ÊÃÊ „Ò ÃÕÊ ∞∑§ ‡flà •flˇÊ¬ ’ŸÃÊ

„Ò–

(ii) ∑§ÊÚ¬⁄U ¬Ê©«U⁄U ∑§Ê Á∑§‚Ë øÊßŸÊ Á«U‡Ê ◊¥ ª◊¸ ∑§⁄UŸ ¬⁄U ∑§ÊÚ¬⁄U ¬Ê©«U⁄U ∑§Ë ‚Ä ∑§Ê‹Ë „Ê ¡ÊÃË „Ò–

(iii) »§⁄U‚ ‚À»§≈U ∑§ „⁄U Á∑§̋S≈U‹Ê¥ ∑§Ê ª◊¸ ∑§⁄UŸ ¬⁄U ∞∑§ ‹Ê‹ ÷Í⁄ ⁄¥Uª ∑§Ê •fl‡Ê· ’ŸÃÊ „Ò ÃÕÊ ¡‹Ã „È∞ ‚À»§⁄U

∑§Ë ª¥œ ∑§Ë ∞∑§ ªÒ‚ ©à‚Á¡¸Ã „ÊÃË „Ò–

(iv) ∑§ÊÚ¬⁄U ‚À»§≈U ∑§ ŸË‹ Áfl‹ÿŸ ◊¥ ‹Ê„ ∑§Ë ∑§Ë‹¥ ⁄Uπ ⁄U„Ÿ ¬⁄U ÷Í⁄UË „Ê ¡ÊÃË „Ò¥ ÃÕÊ ∑§ÊÚ¬⁄U ‚À»§≈U ∑§Ê ŸË‹Ê

⁄¥Uª Á◊≈U ¡ÊÃÊ „Ò–

(v) •Ÿ’ȤÊÊ øÍŸÊ ¡‹ ‚ ¬˝’‹ •Á÷Á∑§̋ÿÊ ∑§⁄U •Áœ∑§ ◊ÊòÊÊ ◊¥ ™§c◊Ê ©à‚Á¡¸Ã ∑§⁄UÃÊ „Ò–

(vi) Á‚Àfl⁄U ŸÊß≈˛U≈U Áfl‹ÿŸ ‚ÊÁ«Uÿ◊ Ä‹Ê⁄UÊß«U Áfl‹ÿŸ ‚ •Á÷Á∑§̋ÿÊ ∑§⁄UÃÊ „Ò ÃÕÊ ∞∑§ ‡flà •flˇÊ¬ ’ŸÃÊ „Ò– Identify the type of chemical reactions in the following processes :

(i) Barium chloride solution is mixed with copper sulphate solution and a white precipitate is

formed.

(ii) On heating copper powder in a china dish, the surface of copper powder becomes black.

(iii) On heating green ferrous sulphate crystals , reddish brown solid is left as residue and a gas

having smell of burning sulphur is evolved.

(iv) Iron nails when left dipped in blue copper sulphate solution become brownish in colour and

blue colour of copper sulphate solution fades away.

(v) Quicklime reacts vigourously with water releasing large amount of heat.

(vi) Silver nitrate solution reacts with sodium chloride solution and a white precipitate is formed.

11 Á¬ûÊ ⁄U‚ ◊¥ ∑§Êß ̧∞ã$¡Êß◊ Ÿ„Ë¥ „ÊÃÊ „Ò ¬⁄UãÃÈ Á¬ûÊ ⁄‚ ∑§ ‹fláÊ ¬ÊøŸ ÃÕÊ fl‚Ê ∑§ •fl‡ÊÊ·áÊ ∑§ Á‹∞ •Êfl‡ÿ∑§ „ÊÃ

„Ò¥– ß‚∑§Ê ∑§Ê⁄UáÊ Á‹Áπ∞–

Bile juice does not contain any enzyme but bile salts are important for digestion and

absorption of fats. State reason.

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12 ‚◊¤ÊÊßÿ Á∑§ ¬‡ÊËÿ ∑§ÊÁ‡Ê∑§Ê•Ê¥ ∑§Ë •Ê∑ΧÁà Á∑§‚ ¬˝∑§Ê⁄U ¬Á⁄UflÁøà „ÊÃË „Ò? 3

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Explain how do muscle cells change their shape ?

13 L§Áœ⁄U ◊¥ ©¬ÁSÕà ÃËŸ ¬˝∑§Ê⁄U ∑§Ë ∑§ÊÁ‡Ê∑§Ê•Ê¥ ∑§ ŸÊ◊ Á‹Áπ∞– ¬˝àÿ∑§ ∑§Ê ∞∑§ ¬˝∑§Êÿ ̧Á‹Áπ∞–

Mention the three kinds of cells present in blood. Write one function of each.

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14 ∞∑§ ÁfllÈà ’À’ 10 Á◊Ÿ≈U ∑§ Á‹∞ 0.5 A œÊ⁄UÊ ‹ÃÊ „Ò– ¬Á⁄U¬Õ ◊¥ ¬˝flÊÁ„à ÁfllÈà •Êfl‡Ê ∑§Ê ¬Á⁄U◊ÊáÊ ¬Á⁄U∑§Á‹Ã

∑§ËÁ¡∞–

An electric bulb draws a current of 0.5 Ampere for 10 minutes. Calculate the amount of

electric charge that flows through the circuit.

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15 (a) ∞∑§ œÊ⁄UÊflÊ„Ë øÊ‹∑§ ∑§Ê ∞∑§ øÈï’∑§Ëÿ ˇÊòÊ ∑§ ‹ï’flØ ⁄UπÊ ªÿÊ „Ò– øÊ‹∑§ ¬⁄U ‹ªŸ flÊ‹ ’‹ ∑§Ë ÁŒ‡ÊÊ

ôÊÊà ∑§⁄UŸ flÊ‹Ê ÁŸÿ◊ Á‹Áπÿ–

(b) øÈï’∑§Ëÿ ˇÊòÊ ◊¥ ⁄Uπ œÊ⁄UÊflÊ„Ë øÊ‹∑§ ¬⁄U ’‹ ’…∏ÊŸ ∑§ ŒÊ ©¬Êÿ Á‹Áπÿ–

(a) A current carrying conductor is placed perpendicular in a magnetic field. Name the

rule which can be used to find the direction of force acting on the conductor.

(b) State two ways to increase the force an a current carrying conductor in a magnetic

field.

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16 »§⁄UÊ« ∑§ ¬˝ÿʪ ◊¥ ÿÁŒ „◊ øÈï’∑§ ∑§Ê ∑ȧá«U‹Ë ∑§Ë •Ê⁄U ªÁà ∑§⁄UÊŸ ∑§ ’¡Êÿ ∑ȧá«U‹Ë ∑§Ê øÈï’∑§ ∑§Ë •Ê⁄U ªÁÃ

∑§⁄UÊ∞° Ã’ ÷Ë ÄÿÊ ∑ȧá«U‹Ë ◊¥ ∑§Ê߸ œÊ⁄UÊ ¬˝Á⁄Uà „ʪË? •¬Ÿ ©ûÊ⁄U ∑§Ë ¬ÈÁc≈U ∑§ËÁ¡∞– ߟ ŒÊŸÊ¥ ¬∑̋§⁄UáÊÊ¥ ∑§Ë ÃÈ‹ŸÊ

∑§ËÁ¡∞–

In Faraday’s experiment if instead of moving the magnet towards the coil we move the coil

towards the magnet. Will there be any induced current? Justify your answer. Compare the

two cases.

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17 ¡Ëflʇ◊ ßZœŸÊ¥ ∑§ ¡‹Ÿ ‚ •àÿÁœ∑§ flÊÿÈ ¬˝ŒÍ·áÊ „ÊÃÊ „Ò– •Áœ∑§Ã⁄U ÿ ¡Ëflʇ◊ ßZœŸ flÊ„ŸÊ¥ ◊¥ ©¬ÿʪ Á∑§∞ ¡ÊÃ

„Ò¥–

(i) ∞∑§ ¡ÊªL§∑§ ŸÊªÁ⁄U∑§ ∑§Ë ÷Ê¥Áà Á∑§ã„Ë¥ ŒÊ ÁflÁœÿÊ¥ ∑§Ë ‚ÍøË ’ŸÊß∞ Á¡Ÿ‚ flÊ„ŸÊ¥ ∑§ ∑§Ê⁄UáÊ „ÊŸ flÊ‹ flÊÿÈ

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¬˝ŒÍ·áÊ ∑§Ê ∑§◊ Á∑§ÿÊ ¡Ê ‚∑§ÃÊ „Ò–

(ii) ¡Ëflʇ◊ ßZœŸÊ¥ ∑§Ê ¡‹ÊŸ ‚ flÊÿÈ ¬Œ̋Í·áÊ ∑§ •ÁÃÁ⁄UÄà ∑§Ê߸ ŒÊ „ÊÁŸ∑§Ê⁄U∑§ ¬÷̋Êfl Á‹Áπ∞–

Burning of fossil fuels cause lots of air pollution. Generally these fossil fuels are used in our

vehicles.

(i) As an aware citizen, list two ways to reduce air pollution caused due to vehicles.

(ii) Write two harmful effects other than air pollution, that are caused due to burning of

fossil fuels .

18 (a) ¡Òfl-◊ÊòÊÊ ∑§Ë ¬Á⁄U÷Ê·Ê Á‹Áπ∞–

(b) ’Êÿʪ҂ ©à¬ÛÊ ∑§⁄UŸ ∑§ Á‹∞ ¬˝ÿÈÄà ¬ŒÊÕ ̧Á‹Áπÿ–

(c) S‹⁄UË ∑§Ê •¬ÉÊ≈UŸ

(a) What is biomass?

(b) Write the raw materials used for obtaining biogas.

(c) What causes decomposition of slurry?

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19 ÁŸïŸ ¬⁄U Á≈Uå¬áÊË ∑§ËÁ¡∞ —

(i) ∞∑§ •ï‹ ∞∑§ ¬ŒÊÕ¸ 'X' ∑§ ‚ÊÕ •Á÷Á∑§̋ÿÊ ∑§⁄U∑§ ∞∑§ ªÒ‚ ©à‚Á¡¸Ã ∑§⁄UÃÊ „Ò ¡Ê ¬ÊÚ¬ äflÁŸ ‚ ¡‹ÃË „Ò–

'X' ∑§Ë ¬˝∑ΧÁà ÄÿÊ „Ò?

(ii) ∞∑§ •ï‹ Z ∑§ ‚ÊÕ •Á÷Á∑§̋ÿÊ ∑§⁄∑§ CO2 ªÒ‚ ©à‚Á¡¸Ã ∑§⁄UÃÊ „Ò– Z ÄÿÊ „Ê ‚∑§ÃÊ „Ò?

(iii) CaO ÃÕÊ SO2 ŒÊ •ÊÚÄ‚Êß«U „Ò¥– ©‚ •ÊÚÄ‚Êß«U ∑§Ê ŸÊ◊ Á‹Áπ∞ ¡Ê Á∑§‚Ë ˇÊÊ⁄U∑§ ∑§ ‚ÊÕ •Á÷Á∑˝§ÿÊ

∑§⁄UªÊ– ∑§Ê⁄UáÊ ŒËÁ¡∞–

(iv) ∞∑§ ‚ÊÁ«Uÿ◊ ÿÊÒÁª∑§ ∑§Ê ©¬ÿʪ ¡‹ ∑§Ë SÕÊÿË ∑§∆UÊ⁄UÃÊ ∑§Ê „≈UÊŸ ∑§ Á‹∞ Á∑§ÿÊ ¡ÊÃÊ „Ò– ©‚ ÿÊÒÁª∑§ ∑§Ê

ŸÊ◊ Á‹Áπ∞–

(v) ∞∑§ ¬ŒÊÕ¸ ∑§Ê Ä‹Ê⁄UËŸ ªÒ‚ ∑§ ‚ÊÕ ©¬øÊÁ⁄Uà ∑§⁄Ÿ ¬⁄U Áfl⁄U¥¡∑§ øÍáÊ ̧©à¬ãŸ „ÊÃÊ „Ò– ©‚ ¬ŒÊÕ ̧∑§Ê ŸÊ◊

Á‹Áπ∞–

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Comment on the following :

(i) An acid reacts with a substance 'X' produces a gas which burns with pop sound.

What is the nature of 'X' ?

(ii) An acid when reacts with Z, produces CO2 gas. What can be

Z ?

(iii) CaO and SO2 are two oxides. Name the oxide which will react with a base. Give

reason.

(iv) A sodium compound is used for removing permanent hardness of water. Name that

compound.

(v) A substance on treatment with chlorine gas yields bleaching powder. Name the

substance.

20 (a) ÕÁ◊¸≈ •Á÷Á∑§̋ÿÊ ÄÿÊ „Ò? ⁄UÊ‚ÊÿÁŸ∑§ ‚◊Ë∑§⁄UáÊ mÊ⁄UÊ ‚◊¤ÊÊßÿ Á∑§ ß‚∑§Ê ©¬ÿʪ ⁄U‹ªÊ«∏Ë ∑§Ë ¬≈UÁ⁄UÿÊ¥ ∑§Ê ¡Ê«∏Ÿ •ÕflÊ ◊‡ÊËŸÊ¥ ∑§Ë Œ⁄UÊ⁄UÊ¥ ∑§Ê ¡Ê«∏Ÿ ∑§ Á‹∞ Á∑§‚ ¬˝∑§Ê⁄U Á∑§ÿÊ ¡ÊÃÊ „Ò–

(b) ÷¡¸Ÿ •ÊÒ⁄U ÁŸSÃʬŸ ◊¥ ©ŒÊ„⁄UáÊ ‚Á„à Áfl÷ŒŸ ∑§ËÁ¡∞–

(a) What is thermite reaction ? Giving chemical equations, explain how it is used to join railway tracks or cracked machine parts ?

(b) Differentiate between roasting and calcination by giving suitable examples.

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21 ÁŸïŸ ¬˝‡ŸÊ¥ ∑§ ©ûÊ⁄U ŒËÁ¡∞– (i) ŒÊ „ÊÚ⁄U◊ÊŸÊ¥ ∑§ ŸÊ◊ Á‹Áπ∞ ¡Ê ÿÊÒflŸÊ⁄Uï÷ ◊¥ ‹«∏∑§ •ÊÒ⁄U ‹«∏Á∑§ÿÊ¥ ◊¥ •ÊŸ flÊ‹ ¬Á⁄UfløŸÊ¥ ‚ ‚ï’h „Ò¥–

©‚ ª̋ÁãÕ ∑§Ê ŸÊ◊ Á‹Áπ∞ ¡Ê ßã„¥ dÊÁflà ∑§⁄UÃË „Ò– (ii) ◊œÈ◊„ ‚ ¬ËÁ«∏à ∑ȧ¿U ⁄UÊÁªÿÊ¥ ∑§Ê ©¬øÊ⁄U ßã‚È‹ËŸ ∑§ ßã¡Ä‡ÊŸ Œ∑§⁄U ÄÿÊ¥ Á∑§ÿÊ ¡ÊÃÊ „Ò– (iii) •ÊÿÊÁ«UŸ ÿÈÄà Ÿ◊∑§ ‹Ÿ ∑§Ë ‚‹Ê„ ÄÿÊ¥ ŒË ¡ÊÃË „Ò? (iv) ¡’ ∑§Ê߸ √ÿÁÄà ÷ÿ÷Ëà „Ê ¡ÊÃÊ „Ò ÃÊ ©‚ „ÊÚ⁄U◊ÊŸ ∑§Ê ŸÊ◊ Á‹Áπ∞ ¡Ê ‚Ëœ „Ë M§Áœ⁄U ◊¥ dÊÁflà „Ê ¡ÊÃÊ

„Ò– ß‚ „ÊÚ⁄U◊ÊŸ ∑§Ê dÊÁflà ∑§⁄UŸ flÊ‹Ë ª̋ÁãÕ ∑§Ê ŸÊ◊ Á‹Áπ∞– Answer the following questions : (i) Name two hormones which bring changes associated with puberty in males and

females. Mention the glands which secrete these hormones. (ii) Why are some patients of diabetes treated by giving injection of insulin ? (iii) Why is the use of iodized salt advisable ? (iv) When a person is scared, name the hormone which is directly secreted into the blood. Mention the gland which secretes this hormone.

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22 (a) Á∑§‚Ë ÁfllÈà ¬Á⁄U¬Õ ◊¥ ŒÊ Á‚⁄UÊ¥ ∑§ ’Ëø Áfl÷flÊ¥Ã⁄U ◊ʬŸ ∑§ Á‹∞ flÊÀ≈U◊Ë≈U⁄U ∑§Ê „◊‡ÊÊ ¬Ê‡fl¸∑˝§◊ ◊¥ ÄÿÊ¥ ‚¥ÿÊÁ¡Ã Á∑§ÿÊ ¡ÊÃÊ „Ò?

(b) Á∑§‚Ë ¬˝ÁÃ⁄UÊœ∑§ ∑§ ŒÊ Á‚⁄UÊ¥ ∑§ ’Ëø Áfl÷flÊ¥Ã⁄U V ∑§ ◊ÊŸ ÃÕÊ ‚ŒÎ‡Ê ¬˝flÊÁ„à ÁfllÈà œÊ⁄UÊ I ∑§ ◊ÊŸ ß‚ ¬˝∑§Ê⁄U ÁŒ∞ ª∞ „Ò¥ —

I (∞Áï¬ÿ⁄U) 1.0 2.0 3.0 4.0 5.0

V (flÊÀ≈U) 3.4 6.8 10.2 13.6 17.0

V ÃÕÊ I ∑§ ◊äÿ ª˝Ê»§ ÁŸL§Á¬Ã ∑§⁄U∑§ ¬˝ÁÃ⁄UÊœ∑§ ∑§Ê ¬Á̋Ã⁄UÊœ ¬Á⁄U∑§Á‹Ã ∑§ËÁ¡∞–

(a) A voltmeter is always connected in parallel in the electric circuit to measure the potential difference between two points. Why ?

(b) Across the resistor the value of current I flowing for the corresponding values of potential difference V, are given as :

I (amperes) 1.0 2.0 3.0 4.0 5.0

V (volts) 3.4 6.8 10.2 13.6 17.0

Plot a graph between V and I and calculate the resistance of the resistor.

5

23 (a) Á∑§‚Ë ‚Ëœ œÊ⁄UÊflÊ„Ë øÊ‹∑§ mÊ⁄UÊ ©à¬ãŸ øÈï’∑§Ëÿ ˇÊòÊ ∑§Ë ÁŒ‡ÊÊ ∑§Ê ÁŸœÊÁ̧⁄Uà ∑§⁄UŸ ∑§ Á‹∞ ∞∑§ Á∑§̋ÿÊ∑§‹Ê¬ ∑§Ê fláʸŸ ∑§ËÁ¡∞– ÿ„ ÷Ë Œ‡Êʸß∞ Á∑§ œÊ⁄UÊ ∑§Ë ÁŒ‡ÊÊ ∑§Ê ©à∑˝§Á◊à ∑§⁄UŸ ¬⁄U øÈï’∑§Ëÿ ˇÊòÊ ∑§Ë ÁŒ‡ÊÊ ÷Ë ©à∑˝§Á◊à „Ê ¡ÊÃË „Ò–

(b) Á∑§‚Ë ∞∑§‚◊ÊŸ øÈï’∑§Ëÿ ˇÊòÊ ◊¥ ŸËø ÁøòÊ ◊¥ Œ‡Êʸ∞ •ŸÈ‚Ê⁄U ˇÊòÊ ∑§ ‹ï’flØ ∑§Ê߸ •À»§Ê ∑§áÊ, (¡Ê œŸÊflÁ‡Êà ∑§áÊ „Ò) ¬˝fl‡Ê ∑§⁄UÃÊ „Ò– ¬˝Ê‚¥Áª∑§ ÁŸÿ◊ ∑§Ê ©À‹π ∑§⁄Uà „È∞ √ÿÊïÿÊ ∑§ËÁ¡∞ Á∑§ ÿ„ •À»§Ê ∑§áÊ Á∑§‚ ÁŒ‡ÊÊ ◊¥ ªÁà ∑§⁄UªÊ?

(a) Describe an activity to determine the direction of magnetic field produced by a current carrying straight conductor. Also show that the direction of the magnetic field is reversed on reversing the direction of current.

(b) An α-particle, (Which is a positively charged particle) enters, a uniform magnetic field at right angles to it as shown below. Stating the relevant

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principle explain in which direction will this α-particle move ?

24 (a) ÁfllÈà øÈï’∑§ ÄÿÊ „ÊÃÊ „Ò? ÿ„ Á∑§‚‚ ’ŸÃÊ „Ò?

(b) ¬˝ÊÿÊÁª∑§ √ÿflSÕÊ ∑§ •Ê⁄Uπ ∑§Ë ‚„ÊÿÃÊ ‚ ∞∑§ Á∑§̋ÿÊ∑§‹Ê¬ ∑§Ê fláʸŸ ∑§ËÁ¡∞ Á¡‚‚ ÿ„ Œ‡ÊʸÿÊ ¡Ê ‚∑§ Á∑§ Á∑§‚Ë ¬˝ÿʪ‡ÊÊ‹Ê ◊¥ ÁfllÈà øÈï’∑§ Á∑§‚ ¬˝∑§Ê⁄U ’ŸÊÿÊ ¡ÊÃÊ „Ò–

(c) œÊ⁄UÊflÊ„Ë ¬Á⁄UŸÊÁ‹∑§Ê ∑§ ¬˝∑§⁄UáÊ ◊¥ ©à¬ãŸ øÈï’∑§Ëÿ ˇÊòÊ ¬Ò≈UŸ¸ ∑§Ë ÃÈ‹ŸÊ ¿U«∏ øÈï’∑§ ∑§ øÈï’∑§Ëÿ ˇÊòÊ ‚ ∑§ËÁ¡∞–

(a) What is an electromagnet ? What does it consist of ?

(b) With the help of a diagram showing experimental arrangement describe an activity to show how an electromagnet can be made in a school laboratory.

(c) Compare the pattern of the field produced in case of a current carrying solenoid with the magnetic field of a bar magnet.

5

÷ʪ-’ / SECTION - B

25 ÿÁŒ •Ê‚Èà ¡‹ ◊¥ HCl Á◊‹Ê ÁŒÿÊ ¡Ê∞ ÃÊ Ÿ∞ Áfl‹ÿŸ ∑§Ê pH „ÊªÊ -

(a) >7 (b) <7 (c) 7 (d) 0

If HCl is added to distilled water, the pH of new solution will be :

(a) >7 (b) <7 (c) 7 (d) 0

1

26 ÁŸïŸ ◊¥ ‚ ©ëøÃ◊ pH ◊ÊŸ Á¡‚∑§Ê „ÊªÊ fl„ „Ò -

(a) ‚ÊÁ«Uÿ◊ ’Ê߸∑§Ê’ʸŸ≈U Áfl‹ÿŸ

(b) ¡‹

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(c) ŸË¥’Í ∑§Ê ⁄U‚

(d) ÃŸÈ ‚ÊÁ«Uÿ◊ „Êß«˛UÊÚÄ‚Êß« Áfl‹ÿŸU

Out of the following, the highest pH value is associated with :

(a) sodium bicarbonate solution

(b) water

(c) lemon juice

(d) dilute sodium hydroxide solution

27 Á∑§‚Ë ¬ŒÊÕ ̧∑§ ∑ȧ¿U ªÈáÊœ◊¸ ŸËø ÁŒ∞ ª∞ „Ò —

(i) ÿ„ ‹Ê‹ Á‹≈U◊‚ ∑§Ê ŸË‹Ê ∑§⁄UÃÊ „Ò–

(ii) ÿ„ ŸË‹ Á‹≈U◊‚ ∑§Ê ‹Ê‹ ∑§⁄UÃÊ „Ò–

(iii) ÿ„ Á¡¥∑§ ‚ •Á÷Á∑§̋ÿÊ ∑§⁄UÃÊ „Ò •ÊÒ⁄U ∞∑§ ªÒ‚ ©à‚Á¡¸Ã „ÊÃË „Ò¥–

(iv) ÿ„ ‚ÊÁ«Uÿ◊ ∑§Ê’ʸŸ≈U ‚ •Á÷Á∑˝§ÿÊ ∑§⁄U á ’ÈŒ’Ȍʄ≈U ©à¬ãŸ ∑§⁄UÃÊ „Ò–

©¬⁄UÊÄà ªÈáÊœ◊ÊZ ◊¥ ‚ ∑§ÊÒŸ ‚ ªÈáÊœ◊¸ ÃŸÈ HCl Œ‡ÊʸÃÊ „Ò —

(a) ∑§fl‹ (i) ÃÕÊ (ii) (b) ∑§fl‹ (i) ÃÕÊ (iii)

(c) ∑§fl‹ (i), (iii) ÃÕÊ (iv) (d) ∑§fl‹ (ii), (iii) ÃÕÊ (iv)

Certain properties of a substance are given below :

(i) It turns red litmus blue

(ii) It turns blue litmus red

(iii) It reacts with zinc and a gas evolved

(iv) It reacts with sodium carbonate to give brisk effervescence

Which out of above properties are shown by dil HCl :

(a) (i) and (ii) only (b) (i) and (iii) only

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(c) (i), (iii) and (iv) only (d) (ii), (iii) and (iv) only

28 ŸËÃÊ Ÿ ∞‹ÈÁ◊ÁŸÿ◊ ∑§Ë ∑ȧ¿U ¬ÁûÊÿÊ° Á¡¥∑§ ‚À»§≈U Áfl‹ÿŸ fl¥ «UÊ‹Ë¥– ©‚∑§ mÊ⁄UÊ Á∑§ÿÊ ªÿÊ ‚„Ë ¬˝ˇÊáÊ „ÊŸÊ øÊÁ„∞-

(a) ∞‹ÈÁ◊ÁŸÿ◊ ∑§Ë ¬ûÊË ¬⁄U ∑§Ê߸ ‹¬ Ÿ„Ë¥ ÁŒπÊß ̧ÁŒÿÊ–

(b) ∞‹ÈÁ◊ÁŸÿ◊ ∑§Ë ¬ûÊË ¬⁄U „⁄U ⁄¥Uª ∑§Ê ‹¬ ÁŒπÊ߸ ÁŒÿÊ–

(c) ∞‹ÈÁ◊ÁŸÿ◊ ∑§Ë ¬ûÊË ¬⁄U ∑§Ê‹ ⁄¥Uª ∑§Ê ‹¬ ÁŒπÊ߸ ÁŒÿÊ–

(d) ∞‹ÈÁ◊ÁŸÿ◊ ∑§Ë ¬ûÊË ¬⁄U øÊ°ŒË ‚Ê ‹¬ ÁŒπÊ߸ ÁŒÿÊ–

Nita added a few strips of aluminium metal to zinc sulphate solution. Correct observation

made by her should be :

(a) No deposit was seen on aluminium

(b) A green coloured deposit was observed on the aluminium strip.

(c) A black coloured deposit was observed on aluminium strip.

(d) A silvery deposit was seen on aluminium metal.

1

29 ‚¬ŸÊ Ÿ ∞‹ÈÁ◊ÁŸÿ◊ ∑§Ë ∞∑§ ¿UÊ≈UË ¬ûÊË ∑§Ê »Ò§⁄U‚ ‚À»§≈U ∑§ Á∑˝§S≈U‹Ê¥ ◊¥ «UÊ‹ ÁŒÿÊ– ©‚∑§ ¬˝ˇÊáÊ „ÊŸ øÊÁ„∞ —

(a) ∑§Ê߸ •Á÷Á∑§̋ÿÊ Ÿ„Ë¥ „ÊÃË–

(b) ∞‹ÈÁ◊ÁŸÿ◊ ‚À»§≈U ∑§ Á∑˝§S≈U‹ ’Ÿ ª∞–

(c) »Ò§⁄U‚ ‚À»§≈U ∑§ Á∑˝§S≈U‹ ⁄¥Uª„ËŸ „Ê ª∞–

(d) ∞‹ÈÁ◊ÁŸÿ◊ „À∑§ „⁄U ⁄¥Uª ∑§Ê „Ê ªÿÊ–

Sapna added a small strip of aluminium to ferrous sulphate crystals. Her observation should

be :

(a) No reaction takes place

(b) Formation of crystals of aluminium sulphate.

(c) Ferrous sulphate crystals turn colourless

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(d) Aluminium turns light green.

30 üÊáÊË∑§̋◊ ◊¥ ‚¥ÿÊÁ¡Ã ŒÊ ¬Á̋Ã⁄UÊœ∑§Ê¥ R1 ÃÕÊ R2 ∑§Ê ÃÈÀÿ ¬˝ÁÃ⁄UÊœ ôÊÊà ∑§⁄UŸ ∑§ Á‹∞ ∞∑§ ¿UÊòÊ ŸËø Œ‡ÊʸÿÊ ªÿÊ

¬Á⁄U¬Õ •Ê⁄U𠩬ÿʪ ∑§⁄UÃÊ „Ò?

ß‚ ¬Á⁄U¬Õ ‚ ¬Ê̋åà „ÊªÊ —

(a) flÊÀ≈UÃÊ V ∑§Ê ‚„Ë ¬Ê∆˜ÿÊ¥∑§ ¬⁄UãÃÈ œÊ⁄UÊ I ∑§Ê ‚„Ë Ÿ„Ë¥–

(b) œÊ⁄UÊ I ∑§Ê ‚„Ë ¬Ê∆˜ÿÊ¥∑§ ¬⁄UãÃÈ flÊÀ≈UÃÊ V ∑§Ê ‚„Ë Ÿ„Ë¥– .

(c) ŒÊŸÊ¥ œÊ⁄UÊ I ÃÕÊ flÊÀ≈UÃÊ V ∑§ ‚„Ë ¬Ê∆˜ÿÊ¥∑§–

(d) ŒÊŸÊ¥ œÊ⁄UÊ I ÃÕÊ flÊÀ≈UÃÊ V ∑§ ¬Ê∆˜ÿÊ¥∑§ ‚„Ë Ÿ„Ë¥–

To find the equivalent resistance of a series combination of two resistors R1 and R2, a student

uses the circuit diagram shown below :

Circuit will give

(a) correct reading of voltage V, but incorrect reading for current I

(b) correct reading of current I but incorrect reading of voltage V.

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(c) correct reading for both current I and voltage V

(d) Incorrect reading for both current I and voltage V.

31 ŒÊ ¬Á̋Ã⁄Uʜʥ ∑§ ‚◊ÊãÃ⁄U ‚¥ÿÊ¡Ÿ ∑§Ê ÃÈÀÿ ¬˝ÁÃ⁄UÊœ ôÊÊà ∑§⁄UŸ ∑§ ¬˝ÿʪ ∑§ Á‹∞ ∞∑§ ¿UÊòÊ Ÿ ÁŸïŸ ¬Á⁄U¬Õ ’ŸÊÿÊ–

©‚∑§ •äÿʬ∑§ Ÿ ß‚ ¡Ê°øÊ •ÊÒ⁄U ∑§„Ê Á∑§ ¬Á⁄U¬Õ ◊¥ ÁŸïŸ ◊¥ ‚ ∞∑§ •ÕflÊ •Ÿ∑§ òÊÈÁ≈UÿÊ° „Ò¥ —

(i) ¬˝ÁÃ⁄UÊœ R1 •ÊÒ⁄U R2 ∑§Ê ‚◊ÊãÃ⁄U ◊¥ Ÿ„Ë¥ ¡Ê«∏Ê ªÿÊ „Ò– (ii) flÊÀ≈U◊Ë≈U⁄U ∑§Ê ‚„Ë Ÿ„Ë¥ ¡Ê«∏Ê ªÿÊ „Ò– (iii) •◊Ë≈U⁄U •ÊÒ⁄U ∑È¥§¡Ë ∑§Ê ‚„Ë Ÿ„Ë¥ ¡Ê«∏Ê ªÿÊ „Ò– ߟ ÃËŸÊ¥ ◊¥ ‚ ¬Á⁄U¬Õ ◊¥ ¡Ê òÊÈÁ≈U „Ò fl„ „Ò-

(a) (i) •ÊÒ⁄U (ii) ŒÊŸÊ¥ (b) (ii) •ÊÒ⁄U (iii) ŒÊŸÊ¥ (c) ∑§fl‹ (i) (d) ∑§fl‹ (ii) For carrying out experiment on finding the equivalent resistance of two resistors connected in

parallel, a student sets up his circuit as shown below. The teacher checks it and tells him that

his circuit has one or more of the following ‘faults’ :

(i) The resistors R1 and R2 have not been correctly connected in parallel. (ii) The Voltmeter has not been correctly connected in the circuit

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(iii) The ammeter and the key have not been correctly connected in the circuit. Out of these three, the actual fault in his circuit is/are :

(a) Both (i) and (ii) (b) Both (ii) and (iii) (b) Only (i) (d) only (ii)

32 “¬˝∑§Ê‡Ê ‚¥‡‹·áÊ ∑§ Á‹∞ ¬˝∑§Ê‡Ê ∑§Ê „ÊŸÊ •Êfl‡ÿ∑§ „Ò” ß‚ ¬̋ÿʪ ◊¥ ¬ûÊË ∑§Ê ∞À∑§Ê„‹ ◊¥ ©’Ê‹Ê ¡ÊÃÊ „Ò ÃÊÁ∑§ —

(a) ß‚∑§Ë ∑§ÊÁ‡Ê∑§Ê∞° ◊Îà „Ê ¡Ê∞° •ÊÒ⁄U ÿ„ Ÿ◊¸ „Ê ¡Ê∞–

(b) ÿ„ Áfl⁄U¥Á¡Ã „Ê ¡Ê∞ •ÊÒ⁄U ¬˝∑§Ê‡Ê ‚¥‡‹·áÊ „ÊŸÊ ’㌠„Ê ¡Ê∞–

(c) Ä‹Ê⁄UÊÁ»§‹ „≈U ¡Ê∞ ÄÿÊ¥Á∑§ ÿ„ •ÊÿÊ«UËŸ ¬⁄UˡÊáÊ ◊¥ ÁflÉŸ «UÊ‹ÃÊ „Ò–

(d) Ä‹Ê⁄UÊÁ»§‹ ‚Á∑˝§ÿ „Ê ¡Ê∞–

In the experiment to show that ‘light is necessary for photosynthesis’, the reason for boiling

the leaf in alcohol is to:

(a) Kill its cells and make it soft

(b) Bleach it so that it stops photosynthesizing

(c) Remove chlorophyll as it interferes with the iodine test

(d) Activate chlorophyll

1

33 “‡fl‚Ÿ ∑§ ŒÊÒ⁄UÊŸ CO2 ©à‚Á¡Ã̧ „ÊÃË „Ò,” Œ‡ÊʸŸ ∑§ ¬˝ÿʪ ◊¥, ©à‚Á¡¸Ã CO2 ∑§ •fl‡ÊÊ·áÊ ∑§ Á‹ÿ ¡Ê ⁄U‚ÊÿŸ ¬˝ÿÈÄÃ

„È•Ê „Ò, fl„ „Ò ó

(a) Mg (OH) 2 Áfl‹ÿŸ (b) KOH Áfl‹ÿŸ

(c) KCl Áfl‹ÿŸ (d) FeSO4 Áfl‹ÿŸ

The chemical used in the experiment to show that ‘CO2 is given out during respiration’, which

absorbs the CO2 released is:

(a) Mg (OH) 2 solution (b) KOH solution

(c) KCl solution (d) FeSO4 solution

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34 Á∑§‚Ë ¿UÊòÊ Ÿ ∞∑§ øÊßŸÊ Á«U‡Ê ◊¥ ∆UÊ‚ Á’ŸÊ ’ȤÊÊ øÍŸÊ ‹∑§⁄U ©‚◊¥ ÕÊ«∏Ë ◊ÊòÊÊ ◊¥ ¡‹ Á◊‹ÊÿÊ–

(a) •Á÷Á∑˝§ÿÊ ◊¥ ©à¬ãŸ äflÁŸ ∑§ ¬˝∑§Ê⁄U ∑§Ê ©À‹π ∑§ËÁ¡∞–

(b) ß‚ •Á÷Á∑˝§ÿÊ ∑§ ¬˝∑§Ê⁄U ∑§Ê ŸÊ◊ Á‹Áπ∞–

A student took solid quick lime in a china Dish and added a small amount of water in it.

(a) State the type of sound produced in the reaction.

(b) Mention the type of this reaction.

2

35 Á∑§‚Ë ¬˝ÁÃ⁄UÊœ∑§ ◊¥ ¬˝flÊÁ„à œÊ⁄UÊ (I) ∑§Ë ©‚ ¬˝ÁÃ⁄UÊœ∑§ ∑§ Á‚⁄UÊ¥ ¬⁄U Áfl÷flÊãÃ⁄U (V) ¬⁄U ÁŸ÷¸⁄UÃÊ ∑§Ê •äÿÿŸ ∑§⁄UŸ ∑§

¬˝ÿʪ ◊¥ „◊ ¬Á⁄U¬Õ ◊¥ ∞◊Ë≈U⁄U •ÊÒ⁄U flÊÀ≈U◊Ë≈U⁄U ∑§Ê Á∑§‚ ¬˝∑§Ê⁄U ‚¥ÿÊÁ¡Ã ∑§⁄Uà „Ò¥, ß‚∑§Ë √ÿÊïÿÊ ∑§ËÁ¡∞–

Explain how we connect an ammeter and a voltmeter in a circuit while performing

experiment for studying the dependence of current (I) on potential difference (V) across a

resistor?

2

36 ⁄¥Uœ˝ Œ‡Êʸà „È∞ Á¬≈ÍUÁŸÿÊ ∑§ ¬ûÊ ∑§Ë Á¤ÊÀ‹Ë ∑§Ê S¬c≈U •SÕÊÿË •Ê⁄UʬáÊ ÃÒÿÊ⁄U ∑§⁄UŸ ∑§ Á‹∞ Á∑§‚Ë ÁfllÊÕ˸ ∑§Ê ¬ûÊË ∑§

Á∑§‚ ÷ʪ ‚ Á¤ÊÀ‹Ë ‹ŸË øÊÁ„∞ ÃÕÊ ÄÿÊ¥?

To prepare a clear temporary mount of the petunia leaf peel showing stomata, from which

part of the leaf the students should get the peel and why ?

2

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